Check if String is an Integer

Question

Hey!
I saw that there is a special method to check if a string is an integer: .isdigit() but I can‘t use it.
Do I have to import a special library for that?
It seems like the interpreter doesn’t know that method...

Answer 1

It should work without modules. Try the following:
st = "123"
bool = st.isdigit()
print(bool)
if bool:
print("runs")

Answer 2

def RepresentsInt(s):
try:
int(s)
return True
except ValueError:
return False
>>> print RepresentsInt("+123")
True
>>> print RepresentsInt("10.0")
False

Answer 3

@Pedro Demingos Thanks! It works. I hope it will in my project too