Is bug or not?

[Cassie]

Hi, I'm having a trouble with new Python 3.7 when use next code, I have got next raise Exception StopIteration, but I have not it when use 2.7.

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def _zip(*args):     iters = list(map(iter, args))     while iters:         res = [next(i) for i in iters]         yield tuple(res)     if __name__ == '__main__':     s1, s2 = 'abc', 'xyz123'     print(list(_zip(s1, s2)))

thanks in advance.

[stranac]

It's not a bug, the behavior was just changed in python 3.5
You can read more at https://www.python.org/dev/peps/pep-0479/

[DeaD_EyE]

I know you made this function as demonstration.
Here an example which works with Python 2.7 and Python 3.7:

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from __future__ import print_function import sys     def _zip1(*args):     iters = list(map(iter, args))     while iters:         res = [next(i) for i in iters]         yield tuple(res)   def _zip2(*args):     for i in zip(*args):         yield tuple(i)     if __name__ == '__main__':     print('Python Version:', sys.version)     s1, s2 = 'abc', 'xyz123'     print('Your example:')     try:         print(list(_zip1(s1, s2)))     except Exception as e:         print(e)     print('Modified version:')     print(list(_zip2(s1, s2)))

Output:
deadeye@nexus ~ $ python w.py 
Python Version: 3.7.0 (default, Jun 28 2018, 17:48:59) 
[GCC 8.1.1 20180531]
Your example:
generator raised StopIteration
Modified version:
[('a', 'x'), ('b', 'y'), ('c', 'z')]
deadeye@nexus ~ $ python2 w.py 
Python Version: 2.7.15 (default, Jun 27 2018, 13:05:28) 
[GCC 8.1.1 20180531]
Your example:
[('a', 'x'), ('b', 'y'), ('c', 'z')]
Modified version:
[('a', 'x'), ('b', 'y'), ('c', 'z')]

The modified function is even shorter and easier to understand.
Have a nice weekend.

[Cassie]

thanks for replies