Failing to import itertools in Python 3.5.2
Question: I am new to Python. I am trying to import izip_longest from itertools. But I
am not able to find the import "itertools" in the preferences in Python
interpreter. I am using Python 3.5.2. It gives me the below error-

    
    
    from itertools import izip_longest
    ImportError: cannot import name 'izip_longest'
    

Please let me know what is the right course of action. I have tried Python 2.7
too and ended up with same problem. Do I need to use lower version Python.


Answer: `izip_longest` was _renamed_ to
[`zip_longest`](https://docs.python.org/3/library/itertools.html#itertools.zip_longest)
in Python 3 (note, no `i` at the start), import that instead:

    
    
    from itertools import zip_longest
    

and use that name in your code.

If you need to write code that works both on Python 2 and 3, catch the
`ImportError` to try the other name, then rename:

    
    
    try:
        # Python 3
        from itertools import zip_longest
    except ImportError
        # Python 2
        from itertools import izip_longest as zip_longest
    
    # use the name zip_longest
    

