CODEWITHSUNDEEP
python
AME
AME

Reputation: 5300

Python: How do I convert a NonType variable to a String?

I have the following function: 

>>> def rule(x):
...     rule = bin(x)[2:].zfill(8)
...     rule = str(rule)
...     print rule

I am trying to convert rule into a string, but when I run the following command, here is what I get: 

>>> type(rule(20))
00010100
<type 'NoneType'>

What is a NoneType variable and how can I convert this variable into a string?

Thanks,

Upvotes: 1

Views: 8151

Answers (2)

SilentGhost
SilentGhost

Reputation: 319561

you need to do:

def rule(x):
    return bin(x)[2:].zfill(8)

All functions return None implicitly if no return statement was encountered during execution of the function (as it is in your case).

Upvotes: 6

Ian Clelland
Ian Clelland

Reputation: 44122

Your rule function doesn't return anything -- it only prints. So, rule(20) returns None -- the python object representing 'no value'. You can't turn that into a string, at least not in the way you are expecting.

You need to define rule to return something, like this:

>>> def rule(x):
...    rule=bin(x)[2:].zfill(8)
...    rule=str(rule)
...    return rule

Then it will return a string object.

Upvotes: 1

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