In the Python programming language, everything is an object including strings. (Yes, everything!)
Python text objects (strings) are created using the Class String. So how can you determine if an object is created from the String class?
You can think of using the method type(), which returns the type of object.
>>> def isExactlyAString(obj):
return type(obj) is type( '')
>>> isExactlyAString(1)
False
>>> isExactlyAString('1')
True
>>>
and also
>>> def isAString (obj):
try: obj + ''
except: return False
else: return True
>>> isAString(1)
False
>>> isAString('1')
True
>>> isAString({1})
False
>>> isAString(['1'])
False
>>>
Although there are no problems with the ideas and methods we can use, there is a better way: isinstance (obj, str)
Python 3.7.5 (default, Nov 20 2019, 09:21:52)
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> def isAString(obj):
... return isinstance(obj,str)
...
>>> isAString(1)
False
>>> isAString('1')
True
>>>
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