astring ('a','tuple')
How do I determine if "x" is a tuple or string?
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3 Answers
if isinstance(x, basestring):
# a string
else:
try: it = iter(x)
except TypeError:
# not an iterable
else:
# iterable (tuple, list, etc)
@Alex Martelli's answer describes in detail why you should prefer the above style when you're working with types in Python (thanks to @Mike Hordecki for the link).
1 Comment
Ayman Hourieh
+1,
isinstance(x, str) and type(x) is str are both wrong as they don't handle unicode. Also, isinstance() is preferred over type() since it handles subclasses.isinstance(x, str)
isinstance(x, tuple)
In general:
isinstance(variable, type)
Checks whether variable is an instance of type (or its subtype) (docs).
PS. Don't forget that strings can also be in unicode (isinstance(x, unicode) in this case) (or isinstance(x, basestring) (thanks, J.F. Sebastian!) which checks for both str and unicode).
1 Comment
PaulMcG
The str vs. unicode distinction disappears in Python 3 - unicode and str are now just str.
use isinstance(), general syntax is:
if isinstance(var, type):
# do something
