Why isn't isnumeric working?

Question

I was going through a very simple python3 guide to using string operations and then I ran into this weird error:

In [4]: # create string
        string = \'L         


        

Answer 1

isnumeric() only works on Unicode strings. To define a string as Unicode you could change your string definitions like so:

In [4]:
        s = u'This is my string'

        isnum = s.isnumeric()

This will now store False.

Note: I also changed your variable name in case you imported the module string.

Answer 2

One Liners:

unicode('200', 'utf-8').isnumeric() # True
unicode('unicorn121', 'utf-8').isnumeric() # False

Or

unicode('200').isnumeric() # True
unicode('unicorn121').isnumeric() # False

Answer 3

if using python 3 wrap string around str as shown below

str('hello').isnumeric()

This way it behaving as expected

Answer 4

No, str objects do not have an isnumeric method. isnumeric is only available for unicode objects. In other words:

>>> d = unicode('some string', 'utf-8')
>>> d.isnumeric()
False
>>> d = unicode('42', 'utf-8')
>>> d.isnumeric()
True