How to check if object is list of type str - python

Question

Say I have the following objects.

    d = ["foo1", "foo2", "foo3", "foo4"]

    c = 1

    a = ["foo1", 6]

I want to check to see if the object is a list of a certain type. If i want to check to see if d is a list and that list contains strings, how would i do that?

d should pass, but c and a should fail the check.

specifically list? Should ("foo", "bar", "baz") fail as well? Or even a str, e.g., "foobar", which is technically iterable as well? — user44484
– user44484, Commented Jun 13, 2014 at 1:13
I think you should take a look at this SO question because checking for types is very often not what you want to do in Python. — user44484
– user44484, Commented Jun 13, 2014 at 1:17

Padraic Cunningham · Accepted Answer · 2014-06-13 00:39:43Z

14

 d = ["foo1", "foo2", "foo3", "foo4"]
 print isinstance(d,list) and all(isinstance(x,str) for x in d)
 True
 d = ["foo1", "foo2", 4, "foo4"]
 print isinstance(d,list) and all(isinstance(x,str) for x in d)
 False

If d is a list and every element in d is a string it will return True. You can check int, dict, etc.. with isinstance

answered Jun 13, 2014 at 0:39

Padraic Cunningham

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1 Comment

Joran Beasley Over a year ago

should really use basestring if you want to count unicode as strings also

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