Time for action – comparing strings

Let's compare strings. Both strings are the word "NumPy":

1. Call the assert_string_equal function to compare a string with itself. This test, of course, should pass:

   print "Pass", np.testing.assert_string_equal("NumPy", "NumPy")

   The test passes:

   Pass None

2. Call the assert_string_equal function to compare a string with another string with the same letters but different casing. This test should throw an exception:

   print "Fail", np.testing.assert_string_equal("NumPy", "Numpy")

   An exception is thrown:

   Fail
   Traceback (most recent call last):
     …
   raiseAssertionError(msg)
   AssertionError: Differences in strings:
   - NumPy?    ^
   + Numpy?    ^

What just happened?

We compared two strings with the assert_string_equal function. The test threw an exception when the casing did not match.