Using the result of type() in a boolean statement?

Terry Reedy tjreedy at
Wed Nov 12 19:45:38 CET 2008

dpapathanasiou wrote:
> If I define a dictionary where one or more of the values is also a
> dictionary, e.g.:
> my_dict={"a":"string", "b":"string", "c":{"x":"0","y":"1"},
> "d":"string"}
> How can I use the output of type() so I can do one thing if the value
> is a string, and another if the value is a dictionary?
> i.e., I'd like to define a loop like this, but I'm not sure of the
> syntax:
> for key, value in my_dict.items():
>   if type{value) is <type 'dict'>:

if type(v) is dict:

>     # do the dictionary logic
>   elif type(value) is <type 'str'>:

... is str

>     # do the string logic

For built-in types without a built-in name, either import the types 
module or just make one yourself with type().

 >>> func = type(lambda:1)
 >>> func
<class 'function'>
 >>> bif = type(abs)
 >>> bif
<class 'builtin_function_or_method'>

For userclass instances, use the userclass.

Terry Jan Reedy

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