To check if an input is a number in Python, you can use the
isdigit() method for strings or use exception handling to attempt conversion to a numeric type. Here are two approaches:
user_input = input("Enter something: ") if user_input.isdigit(): print("Input is a number") else: print("Input is not a number")
In this example, we use the
input() function to prompt the user to enter something. The input is stored in the
We then use the
isdigit() method to check if the
user_input consists only of digits. If the input is composed entirely of digits, the
isdigit() method returns
True, and we print “Input is a number”. Otherwise, if the input contains non-digit characters, we print “Input is not a number”.
isdigit() is applicable only for strings and checks if all characters in the string are digits.
- Using exception handling for numeric conversion:
user_input = input("Enter something: ") try: float(user_input) print("Input is a number") except ValueError: print("Input is not a number")
In this approach, we use the
float() function to attempt to convert the
user_input to a floating-point number. If the conversion succeeds without raising a
ValueError exception, we consider the input as a number and print “Input is a number”. Otherwise, if a
ValueError is raised, we conclude that the input is not a number and print “Input is not a number”.
You can modify the conversion function (
float() in this case) based on your specific needs, such as
int() for checking integer inputs.