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track comment scraping system created, rest_api exercise tweaked
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Xevion
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{"track":"python","exercise":"grep","id":"c5d464b7392248d6adaab310e49803f5","url":"https://exercism.io/my/solutions/c5d464b7392248d6adaab310e49803f5","handle":"Xevion","is_requester":true,"auto_approve":false}
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# Grep
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Search a file for lines matching a regular expression pattern. Return the line
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number and contents of each matching line.
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The Unix [`grep`](http://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html) command can be used to search for lines in one or more files
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that match a user-provided search query (known as the *pattern*).
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The `grep` command takes three arguments:
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1. The pattern used to match lines in a file.
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2. Zero or more flags to customize the matching behavior.
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3. One or more files in which to search for matching lines.
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Your task is to implement the `grep` function, which should read the contents
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of the specified files, find the lines that match the specified pattern
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and then output those lines as a single string. Note that the lines should
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be output in the order in which they were found, with the first matching line
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in the first file being output first.
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As an example, suppose there is a file named "input.txt" with the following contents:
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```text
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hello
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world
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hello again
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```
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If we were to call `grep "hello" input.txt`, the returned string should be:
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```text
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hello
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hello again
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```
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### Flags
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As said earlier, the `grep` command should also support the following flags:
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- `-n` Print the line numbers of each matching line.
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- `-l` Print only the names of files that contain at least one matching line.
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- `-i` Match line using a case-insensitive comparison.
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- `-v` Invert the program -- collect all lines that fail to match the pattern.
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- `-x` Only match entire lines, instead of lines that contain a match.
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If we run `grep -n "hello" input.txt`, the `-n` flag will require the matching
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lines to be prefixed with its line number:
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```text
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1:hello
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3:hello again
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```
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And if we run `grep -i "HELLO" input.txt`, we'll do a case-insensitive match,
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and the output will be:
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```text
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hello
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hello again
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```
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The `grep` command should support multiple flags at once.
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For example, running `grep -l -v "hello" file1.txt file2.txt` should
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print the names of files that do not contain the string "hello".
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## Exception messages
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Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to
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indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not
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every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include
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a message.
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To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
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`raise Exception`, you should write:
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```python
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raise Exception("Meaningful message indicating the source of the error")
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```
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## Running the tests
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To run the tests, run the appropriate command below ([why they are different](https://github.com/pytest-dev/pytest/issues/1629#issue-161422224)):
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- Python 2.7: `py.test grep_test.py`
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- Python 3.4+: `pytest grep_test.py`
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Alternatively, you can tell Python to run the pytest module (allowing the same command to be used regardless of Python version):
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`python -m pytest grep_test.py`
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### Common `pytest` options
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- `-v` : enable verbose output
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- `-x` : stop running tests on first failure
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- `--ff` : run failures from previous test before running other test cases
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For other options, see `python -m pytest -h`
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## Submitting Exercises
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Note that, when trying to submit an exercise, make sure the solution is in the `$EXERCISM_WORKSPACE/python/grep` directory.
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You can find your Exercism workspace by running `exercism debug` and looking for the line that starts with `Workspace`.
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For more detailed information about running tests, code style and linting,
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please see [Running the Tests](http://exercism.io/tracks/python/tests).
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## Source
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Conversation with Nate Foster. [http://www.cs.cornell.edu/Courses/cs3110/2014sp/hw/0/ps0.pdf](http://www.cs.cornell.edu/Courses/cs3110/2014sp/hw/0/ps0.pdf)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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def grep(pattern, flags, files):
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pass
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import unittest
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try:
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import builtins
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except ImportError:
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import __builtin__ as builtins
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from grep import grep
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# Tests adapted from `problem-specifications//canonical-data.json` @ v1.2.0
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ILIADFILENAME = 'iliad.txt'
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ILIADCONTENTS = '''Achilles sing, O Goddess! Peleus' son;
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His wrath pernicious, who ten thousand woes
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Caused to Achaia's host, sent many a soul
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Illustrious into Ades premature,
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And Heroes gave (so stood the will of Jove)
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To dogs and to all ravening fowls a prey,
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When fierce dispute had separated once
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The noble Chief Achilles from the son
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Of Atreus, Agamemnon, King of men.'''
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MIDSUMMERNIGHTFILENAME = 'midsummer-night.txt'
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MIDSUMMERNIGHTCONTENTS = '''I do entreat your grace to pardon me.
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I know not by what power I am made bold,
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Nor how it may concern my modesty,
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In such a presence here to plead my thoughts;
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But I beseech your grace that I may know
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The worst that may befall me in this case,
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If I refuse to wed Demetrius.'''
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PARADISELOSTFILENAME = 'paradise-lost.txt'
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PARADISELOSTCONTENTS = '''Of Mans First Disobedience, and the Fruit
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Of that Forbidden Tree, whose mortal tast
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Brought Death into the World, and all our woe,
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With loss of Eden, till one greater Man
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Restore us, and regain the blissful Seat,
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Sing Heav'nly Muse, that on the secret top
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Of Oreb, or of Sinai, didst inspire
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That Shepherd, who first taught the chosen Seed'''
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FILENAMES = [
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ILIADFILENAME,
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MIDSUMMERNIGHTFILENAME,
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PARADISELOSTFILENAME,
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]
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FILES = {}
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class File(object):
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def __init__(self, name=''):
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self.name = name
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self.contents = ''
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def read(self):
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return self.contents
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def readlines(self):
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return [line + '\n' for line in self.read().split('\n') if line]
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def write(self, data):
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self.contents += data
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def __enter__(self):
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return self
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def __exit__(self, *args):
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pass
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# Store builtin definition of open()
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builtins.oldopen = builtins.open
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def open(name, mode='r', *args, **kwargs):
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# if name is a mocked file name, lookup corresponding mocked file
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if name in FILENAMES:
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if mode == 'w' or name not in FILES:
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FILES[name] = File(name)
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return FILES[name]
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# else call builtin open()
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else:
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return builtins.oldopen(name, mode, *args, **kwargs)
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builtins.open = open
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# remove mocked file contents
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def remove_file(file_name):
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del FILES[file_name]
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def create_file(name, contents):
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with open(name, 'w') as f:
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f.write(contents)
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class GrepTest(unittest.TestCase):
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@classmethod
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def setUpClass(self):
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# Override builtin open() with mock-file-enabled one
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builtins.open = open
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create_file(ILIADFILENAME, ILIADCONTENTS)
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create_file(MIDSUMMERNIGHTFILENAME, MIDSUMMERNIGHTCONTENTS)
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create_file(PARADISELOSTFILENAME, PARADISELOSTCONTENTS)
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self.maxDiff = None
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@classmethod
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def tearDownClass(self):
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remove_file(ILIADFILENAME)
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remove_file(MIDSUMMERNIGHTFILENAME)
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remove_file(PARADISELOSTFILENAME)
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# Restore builtin open()
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builtins.open = builtins.oldopen
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def test_one_file_one_match_no_flags(self):
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self.assertMultiLineEqual(
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grep("Agamemnon", "", [ILIADFILENAME]),
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"Of Atreus, Agamemnon, King of men.\n"
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)
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def test_one_file_one_match_print_line_numbers_flag(self):
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self.assertMultiLineEqual(
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grep("Forbidden", "-n", [PARADISELOSTFILENAME]),
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"2:Of that Forbidden Tree, whose mortal tast\n"
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)
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def test_one_file_one_match_case_insensitive_flag(self):
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self.assertMultiLineEqual(
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grep("FORBIDDEN", "-i", [PARADISELOSTFILENAME]),
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"Of that Forbidden Tree, whose mortal tast\n"
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)
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def test_one_file_one_match_print_file_names_flag(self):
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self.assertMultiLineEqual(
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grep("Forbidden", "-l", [PARADISELOSTFILENAME]),
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PARADISELOSTFILENAME + '\n')
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def test_one_file_one_match_match_entire_lines_flag(self):
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self.assertMultiLineEqual(
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grep("With loss of Eden, till one greater Man",
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"-x", [PARADISELOSTFILENAME]),
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"With loss of Eden, till one greater Man\n")
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def test_one_file_one_match_multiple_flags(self):
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self.assertMultiLineEqual(
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grep("OF ATREUS, Agamemnon, KIng of MEN.",
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"-n -i -x", [ILIADFILENAME]),
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"9:Of Atreus, Agamemnon, King of men.\n")
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def test_one_file_several_matches_no_flags(self):
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self.assertMultiLineEqual(
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grep("may", "", [MIDSUMMERNIGHTFILENAME]),
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"Nor how it may concern my modesty,\n"
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"But I beseech your grace that I may know\n"
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"The worst that may befall me in this case,\n")
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def test_one_file_several_matches_print_line_numbers_flag(self):
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self.assertMultiLineEqual(
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grep("may", "-n", [MIDSUMMERNIGHTFILENAME]),
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"3:Nor how it may concern my modesty,\n"
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"5:But I beseech your grace that I may know\n"
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"6:The worst that may befall me in this case,\n")
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def test_one_file_several_matches_match_entire_lines_flag(self):
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self.assertMultiLineEqual(
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grep("may", "-x", [MIDSUMMERNIGHTFILENAME]),
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"")
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def test_one_file_several_matches_case_insensitive_flag(self):
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self.assertMultiLineEqual(
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grep("ACHILLES", "-i", [ILIADFILENAME]),
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"Achilles sing, O Goddess! Peleus' son;\n"
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"The noble Chief Achilles from the son\n")
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def test_one_file_several_matches_inverted_flag(self):
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self.assertMultiLineEqual(
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grep("Of", "-v", [PARADISELOSTFILENAME]),
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"Brought Death into the World, and all our woe,\n"
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"With loss of Eden, till one greater Man\n"
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"Restore us, and regain the blissful Seat,\n"
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"Sing Heav'nly Muse, that on the secret top\n"
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"That Shepherd, who first taught the chosen Seed\n")
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def test_one_file_one_match_file_flag_takes_precedence_over_line(self):
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self.assertMultiLineEqual(
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grep("ten", "-n -l", [ILIADFILENAME]),
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ILIADFILENAME + '\n')
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def test_one_file_no_matches_various_flags(self):
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self.assertMultiLineEqual(
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grep("Gandalf", "-n -l -x -i", [ILIADFILENAME]),
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"")
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def test_multiple_files_one_match_no_flags(self):
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self.assertMultiLineEqual(
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grep("Agamemnon", "", FILENAMES),
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"iliad.txt:Of Atreus, Agamemnon, King of men.\n")
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def test_multiple_files_several_matches_no_flags(self):
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self.assertMultiLineEqual(
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grep("may", "", FILENAMES),
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"midsummer-night.txt:Nor how it may concern my modesty,\n"
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"midsummer-night.txt:But I beseech your grace that I may know\n"
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"midsummer-night.txt:The worst that may befall me in this case,\n")
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def test_multiple_files_several_matches_print_line_numbers_flag(self):
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expected = (
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"midsummer-night.txt:5:But I beseech your grace that I may know\n"
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"midsummer-night.txt:6:The worst that may befall me in this case,"
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"\nparadise-lost.txt:2:Of that Forbidden Tree, whose mortal tast\n"
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"paradise-lost.txt:6:Sing Heav'nly Muse, that on the secret top\n")
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self.assertMultiLineEqual(grep("that", "-n", FILENAMES), expected)
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def test_multiple_files_one_match_print_file_names_flag(self):
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self.assertMultiLineEqual(
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grep("who", "-l", FILENAMES),
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ILIADFILENAME + '\n' + PARADISELOSTFILENAME + '\n')
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def test_multiple_files_several_matches_case_insensitive_flag(self):
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expected = (
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"iliad.txt:Caused to Achaia's host, sent many a soul\n"
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"iliad.txt:Illustrious into Ades premature,\n"
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"iliad.txt:And Heroes gave (so stood the will of Jove)\n"
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"iliad.txt:To dogs and to all ravening fowls a prey,\n"
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"midsummer-night.txt:I do entreat your grace to pardon me.\n"
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"midsummer-night.txt:In such a presence here to plead my thoughts;"
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"\nmidsummer-night.txt:If I refuse to wed Demetrius.\n"
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"paradise-lost.txt:Brought Death into the World, and all our woe,"
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"\nparadise-lost.txt:Restore us, and regain the blissful Seat,\n"
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"paradise-lost.txt:Sing Heav'nly Muse, that on the secret top\n")
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self.assertMultiLineEqual(grep("TO", "-i", FILENAMES), expected)
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def test_multiple_files_several_matches_inverted_flag(self):
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self.assertMultiLineEqual(
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grep("a", "-v", FILENAMES),
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"iliad.txt:Achilles sing, O Goddess! Peleus' son;\n"
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"iliad.txt:The noble Chief Achilles from the son\n"
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"midsummer-night.txt:If I refuse to wed Demetrius.\n"
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)
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def test_multiple_files_one_match_match_entire_lines_flag(self):
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self.assertMultiLineEqual(
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grep("But I beseech your grace that I may know", "-x", FILENAMES),
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"midsummer-night.txt:But I beseech your grace that I may know\n")
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def test_multiple_files_one_match_multiple_flags(self):
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self.assertMultiLineEqual(
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grep("WITH LOSS OF EDEN, TILL ONE GREATER MAN", "-n -i -x",
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FILENAMES),
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"paradise-lost.txt:4:With loss of Eden, till one greater Man\n")
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def test_multiple_files_no_matches_various_flags(self):
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self.assertMultiLineEqual(
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grep("Frodo", "-n -l -x -i", FILENAMES),
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""
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)
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def test_multiple_files_several_matches_file_flag_takes_precedence(self):
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self.assertMultiLineEqual(
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grep("who", "-n -l", FILENAMES),
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ILIADFILENAME + '\n' + PARADISELOSTFILENAME + '\n')
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def test_multiple_files_several_matches_inverted_match_entire_lines(self):
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expected = (
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"iliad.txt:Achilles sing, O Goddess! Peleus' son;\n"
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"iliad.txt:His wrath pernicious, who ten thousand woes\n"
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"iliad.txt:Caused to Achaia's host, sent many a soul\n"
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"iliad.txt:And Heroes gave (so stood the will of Jove)\n"
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"iliad.txt:To dogs and to all ravening fowls a prey,\n"
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"iliad.txt:When fierce dispute had separated once\n"
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"iliad.txt:The noble Chief Achilles from the son\n"
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"iliad.txt:Of Atreus, Agamemnon, King of men.\n"
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"midsummer-night.txt:I do entreat your grace to pardon me.\n"
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"midsummer-night.txt:I know not by what power I am made bold,\n"
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"midsummer-night.txt:Nor how it may concern my modesty,\n"
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"midsummer-night.txt:In such a presence here to plead my thoughts;"
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"\nmidsummer-night.txt:But I beseech your grace that I may know\n"
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"midsummer-night.txt:The worst that may befall me in this case,\n"
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"midsummer-night.txt:If I refuse to wed Demetrius.\n"
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"paradise-lost.txt:Of Mans First Disobedience, and the Fruit\n"
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"paradise-lost.txt:Of that Forbidden Tree, whose mortal tast\n"
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"paradise-lost.txt:Brought Death into the World, and all our woe,"
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"\nparadise-lost.txt:With loss of Eden, till one greater Man\n"
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"paradise-lost.txt:Restore us, and regain the blissful Seat,\n"
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"paradise-lost.txt:Sing Heav'nly Muse, that on the secret top\n"
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"paradise-lost.txt:Of Oreb, or of Sinai, didst inspire\n"
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"paradise-lost.txt:That Shepherd, who first taught the chosen Seed"
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"\n"
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)
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self.assertMultiLineEqual(
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grep("Illustrious into Ades premature,", "-x -v", FILENAMES),
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expected
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)
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if __name__ == '__main__':
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unittest.main()
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Reference in New Issue
Block a user