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
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