How do I check if a string represents a number in Python?
To check if a string represents a number (float or int) in Python, you can try casting it to a float or int and check if the cast was successful. If the string can't be cast, then it is not a number.
Here is an example:
def is_number(s):
try:
float(s)
return True
except ValueError:
return False
print(is_number('123')) # True
print(is_number('123.456')) # True
print(is_number('123a')) # False
print(is_number('abc')) # False
Alternatively, you can use the isdigit method of strings:
def is_number(s):
return s.isdigit()
print(is_number('123')) # True
print(is_number('123.456')) # False
print(is_number('123a')) # False
print(is_number('abc')) # False
Note that the isdigit method will only return True for strings that consist only of digits and that do not have a decimal point. It will return False for strings like '123.456' or '123a'.
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