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I want to provide six for compatible my code in python2 and python3 version. I have got the example from online but did not get more sources to get the six example in online. In the below code, i could not understand why they have created class for test cases and have written this line
class SampleTests(unittest.TestCase):
and inside main, how did they call the class SampleTests
? and how unittest.main()
inside main call the class?
Kindly help me. if possible kindly give some sample example of six module migration.
import six
from six.moves import reduce
import unittest
def multiply_values(val1, val2):
return val1*val2
def add_values(val1, val2):
return val1+val2
class SampleTests(unittest.TestCase):
def test_sets_equal(self):
setValue1 = reduce(multiply_values, [1,2])
setValue2 = reduce(add_values, [1,2])
six.assertCountEqual(self, [2,3], [setValue1,setValue2])
if __name__ == '__main__':
unittest.main()
答案1
In your example six
is used for two things:
reduce
was removed in Python 3 and replace byfunctools.reduce
sosix
offers a handy "alias" for it so you can callreduce
in both 2 and 3.assertCountEqual
is part of unittest in Python 3 sosix
here provides its own implementation for Python 2.
The best documentation for the six
module is available here: https://six.readthedocs.io/
Note: Python 2 is deprecated now and you shouldn't be using it for new projects. six
will help you write code that works on both versions of Python but if you don't have a good reason for supporting Python 2, it would be better to write a Python 3 only code. 2to3 tool can you help with converting Python 2 code to Python 3.
why they have created class for test cases and have written this line class SampleTests(unittest.TestCase): and Inside main, how did they call the class SampleTests
This isn't really six
specific question, this is how the unittest
module works on both Python 2 and 3, see https://docs.python.org/3/library/unittest.html for details.
TL;DR version: unittest.main()
will automatically run all the test cases in the file and test case is defined as a function which name starts with test_
in a unittest.TestCase
class.