Problem in checking the type of the variable

Question

I have a list of dictionary :

list=[{'step' : '1' , 'name' : 'A'}]

and I want to check type of the value of step key in a if condition.

I have tried :

if (x=isinstance(list[0]['step'],str)) :

But i got this error :

TypeError: isinstance() arg 2 must be a type or tuple of types

Also I tried :

list[0]['step'].__class__ == str

but got an error as well. What is the right way to do it?

Don't use `list` and `str` as names for your variables. – Aran-Fey Apr 11 '19 at 14:06 — Aran-Fey, Apr 11 '19 at 14:06

Mohamed Ali JAMAOUI · Answer 1 · 2019-04-11T14:27:14.480

1

Don't use list as a variable name, because it's already used by python for datatype list. If you change list to mylist, the check works.

In [1]: mylist=[{'step' : '1' , 'name' : 'A'}]

In [2]: mylist 
Out[2]: [{'name': 'A', 'step': '1'}]

In [3]: if isinstance(mylist[0]["step"], str):
   ...:     print(True)
   ...:     
True

edited Apr 11 '19 at 14:27

answered Apr 11 '19 at 14:07

Mohamed Ali JAMAOUI

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Problem in checking the type of the variable

1 Answers1