检查字符串是否在python中包含数字

Question

I am checking a string in python for a digit. I have used the is_digit() method but doesnt look like it works. this is my string 302 E 34th 101 so i want to check if the last split of the string is a digit and if true,cut it and assign it to a value. here is my code

if split("302 E 34th 101")[-1].is_digit():
  digit=split("302 E 34th 101")[-1]

this doesnt seem to work as expected since it does not return result. Does anyone know the best way to do this? maybe using a regular expression? Thanks in advance.

Answer 1

It seems that you are using a custom split function which doesn't split the string properly. Instead you can use str.split method and use isdigit() for validating the digit format:

>>> s.split()[-1]
'101'
>>> s.split()[-1].isdigit()
True

Answer 2

That's just not how you split in python. You need to call the method on the string object like this:

if "302 E 34th 101".split()[-1].isdigit():
    digit = "302 E 34th 101".split()[-1]

Here's a link to the docs

Answer 3

You can rsplit or rfind if you always want to check based on whitespace:

s = "302 E 34th 101"
print(s[s.rfind(" "):].isdigit())

print(s.rsplit(None,1)[-1].isdigit())