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# Python3.x Python3 isdigit() Method [ Python3 Strings](#) * * * ## Description The Python isdigit() method checks whether all characters in the string are digits. ## Syntax The syntax for the isdigit() method is: str.isdigit() ## Parameters * None. ## Return Value Returns True if all characters in the string are digits, otherwise returns False. ## Example The following examples demonstrate the usage of the isdigit() method: ## Example #!/usr/bin/python3 str="123456"; print(str.isdigit()) str="Tutorial example....wow!!!" print(str.isdigit()) The output of the above examples is: TrueFalse The isdigit() method only works correctly for positive integers. It returns incorrect results for negative numbers and decimals. You can use the following function to solve this problem: ## Example # Check if it is a number def is_number(s): try: # If the float(s) statement can be executed, return True (string s is a float) float(s)return True except ValueError: # ValueError is a standard Python exception, indicating "invalid argument passed" pass# If a ValueError exception is raised, do nothing (pass: do nothing, often used as a placeholder) try: import unicodedata# Package for handling ASCII codes unicodedata.numeric(s)# Function that converts a string representing a number to a float return True except(TypeError, ValueError): pass return False print(is_number(1))print(is_number(1.0))print(is_number(0))print(is_number(-2))print(is_number(-2.0))print(is_number("abc")) The output is: TrueTrueTrueTrueTrueFalse * * Python3 Strings](#)