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Didn't find a test for `get_anagrams()` using `self.assertRaises()` and an empty string
I didn't really understand assertRaises...
Can someone explain to me how this whole darn thing works? Thanks.
import unittest from string_fun import get_anagrams class AnagramTestCase(unittest.TestCase): def test_empty_string(self): get_anagrams('') self.assertRaises(ValueError)
import itertools def is_palindrome(yarn): """Return whether or not a string is a palindrome. A palindrome is a word/phrase that's the same in both directions. """ return yarn == yarn[::-1] def get_anagrams(*yarn): """Return a list of anagrams for a string.""" # If only one letter came in, return it if yarn: if len(yarn) == 1: return list(yarn) elif len(yarn == 0): raise ValueError("Must provide at least two letters") else: raise ValueError("Must provide at least two letters") # Get all of the words from the dictionary words = set([ w.strip().lower() for w in open('words.txt') ]) output = set() for thread in yarn: thread = thread.lower() # Find all possible anagrams for i in range(2, len(thread)): fibers = set( [''.join(w) for w in itertools.permutations(thread, i)] ) output.update(fibers.intersection(words)) # Finally, return all of the combinations that are in the dictionary return sorted(list(output))
Chris FreemanTreehouse Moderator 68,030 Points
You are very close.
assertRaises should be used in a
with block to properly handle the raised error:
class AnagramTestCase(unittest.TestCase): def test_empty_string(self): with self.assertRaises(ValueError): get_anagrams('')