Python: word_count

python/word-count/.exercism/metadata.json

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+{"track":"python","exercise":"word-count","id":"5ff53f015ab940dfa8ca06bcd9c6cd76","url":"https://exercism.io/my/solutions/5ff53f015ab940dfa8ca06bcd9c6cd76","handle":"DmitryKokorin","is_requester":true,"auto_approve":false}

python/word-count/README.md

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+# Word Count
+
+Given a phrase, count the occurrences of each _word_ in that phrase.
+
+For the purposes of this exercise you can expect that a _word_ will always be one of:
+
+1. A _number_ composed of one or more ASCII digits (ie "0" or "1234") OR
+2. A _simple word_ composed of one or more ASCII letters (ie "a" or "they") OR
+3. A _contraction_ of two _simple words_ joined by a single apostrophe (ie "it's" or "they're")
+
+When counting words you can assume the following rules:
+
+1. The count is _case insensitive_ (ie "You", "you", and "YOU" are 3 uses of the same word)
+2. The count is _unordered_; the tests will ignore how words and counts are ordered
+3. Other than the apostrophe in a _contraction_ all forms of _punctuation_ are ignored
+4. The words can be separated by _any_ form of whitespace (ie "\t", "\n", " ")
+
+For example, for the phrase `"That's the password: 'PASSWORD 123'!", cried the Special Agent.\nSo I fled.` the count would be:
+
+```text
+that's: 1
+the: 2
+password: 2
+123: 1
+cried: 1
+special: 1
+agent: 1
+so: 1
+i: 1
+fled: 1
+```
+
+
+## Exception messages
+
+Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to
+indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not
+every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include
+a message.
+
+To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
+`raise Exception`, you should write:
+
+```python
+raise Exception("Meaningful message indicating the source of the error")
+```
+
+## Running the tests
+
+To run the tests, run `pytest word_count_test.py`
+
+Alternatively, you can tell Python to run the pytest module:
+`python -m pytest word_count_test.py`
+
+### Common `pytest` options
+
+- `-v` : enable verbose output
+- `-x` : stop running tests on first failure
+- `--ff` : run failures from previous test before running other test cases
+
+For other options, see `python -m pytest -h`
+
+## Submitting Exercises
+
+Note that, when trying to submit an exercise, make sure the solution is in the `$EXERCISM_WORKSPACE/python/word-count` directory.
+
+You can find your Exercism workspace by running `exercism debug` and looking for the line that starts with `Workspace`.
+
+For more detailed information about running tests, code style and linting,
+please see [Running the Tests](http://exercism.io/tracks/python/tests).
+
+## Source
+
+This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

python/word-count/word_count.py

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+from collections import Counter
+import re
+
+WORDS_REGEXP = re.compile(r"([^\W_]+('[^\W_]+)?)")
+
+
+def count_words(sentence):
+    words = [value[0].lower() for value in re.findall(WORDS_REGEXP, sentence)]
+    return Counter(words)

python/word-count/word_count_test.py

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+import unittest
+
+from word_count import count_words
+
+# Tests adapted from `problem-specifications//canonical-data.json`
+
+
+class WordCountTest(unittest.TestCase):
+    def test_count_one_word(self):
+        self.assertEqual(count_words("word"), {"word": 1})
+
+    def test_count_one_of_each_word(self):
+        self.assertEqual(count_words("one of each"), {"one": 1, "of": 1, "each": 1})
+
+    def test_multiple_occurrences_of_a_word(self):
+        self.assertEqual(
+            count_words("one fish two fish red fish blue fish"),
+            {"one": 1, "fish": 4, "two": 1, "red": 1, "blue": 1},
+        )
+
+    def test_handles_cramped_lists(self):
+        self.assertEqual(count_words("one,two,three"), {"one": 1, "two": 1, "three": 1})
+
+    def test_handles_expanded_lists(self):
+        self.assertEqual(
+            count_words("one,\ntwo,\nthree"), {"one": 1, "two": 1, "three": 1}
+        )
+
+    def test_ignore_punctuation(self):
+        self.assertEqual(
+            count_words("car: carpet as java: javascript!!&@$%^&"),
+            {"car": 1, "carpet": 1, "as": 1, "java": 1, "javascript": 1},
+        )
+
+    def test_include_numbers(self):
+        self.assertEqual(
+            count_words("testing, 1, 2 testing"), {"testing": 2, "1": 1, "2": 1}
+        )
+
+    def test_normalize_case(self):
+        self.assertEqual(count_words("go Go GO Stop stop"), {"go": 3, "stop": 2})
+
+    def test_with_apostrophes(self):
+        self.assertEqual(
+            count_words("First: don't laugh. Then: don't cry."),
+            {"first": 1, "don't": 2, "laugh": 1, "then": 1, "cry": 1},
+        )
+
+    def test_with_quotations(self):
+        self.assertEqual(
+            count_words("Joe can't tell between 'large' and large."),
+            {"joe": 1, "can't": 1, "tell": 1, "between": 1, "large": 2, "and": 1},
+        )
+
+    def test_substrings_from_the_beginning(self):
+        self.assertEqual(
+            count_words("Joe can't tell between app, apple and a."),
+            {
+                "joe": 1,
+                "can't": 1,
+                "tell": 1,
+                "between": 1,
+                "app": 1,
+                "apple": 1,
+                "and": 1,
+                "a": 1,
+            },
+        )
+
+    def test_multiple_spaces_not_detected_as_a_word(self):
+        self.assertEqual(
+            count_words(" multiple   whitespaces"), {"multiple": 1, "whitespaces": 1}
+        )
+
+    def test_alternating_word_separators_not_detected_as_a_word(self):
+        self.assertEqual(
+            count_words(",\n,one,\n ,two \n 'three'"), {"one": 1, "two": 1, "three": 1}
+        )
+
+    # Additional tests for this track
+
+    def test_tabs(self):
+        self.assertEqual(
+            count_words(
+                "rah rah ah ah ah	roma roma ma	ga ga oh la la	want your bad romance"
+            ),
+            {
+                "rah": 2,
+                "ah": 3,
+                "roma": 2,
+                "ma": 1,
+                "ga": 2,
+                "oh": 1,
+                "la": 2,
+                "want": 1,
+                "your": 1,
+                "bad": 1,
+                "romance": 1,
+            },
+        )
+
+    def test_non_alphanumeric(self):
+        self.assertEqual(
+            count_words("hey,my_spacebar_is_broken"),
+            {"hey": 1, "my": 1, "spacebar": 1, "is": 1, "broken": 1},
+        )
+
+    def test_multiple_apostrophes_ignored(self):
+        self.assertEqual(count_words("''hey''"), {"hey": 1})
+
+
+if __name__ == "__main__":
+    unittest.main()