Python string isdecimal() Method

Python String isdecimal() function returns true if all characters in a string are decimal, else it returns False.

Python String isdecimal() Method Syntax: 

Syntax: string_name.isdecimal(), string_name is the string whose characters are to be checked

Parameters:This method does not takes any parameters .

Return: boolean value. True – all characters are decimal, False – one or more than one character is not decimal.

Python String isdecimal() Method Example:

Python3

print("100".isdecimal())

Output:

True

Example: Basic Usage of Python String decimal() Method

Program to demonstrate the use of Python String decimal() Method.

Python3

s = "12345"
print(s.isdecimal())

# contains alphabets
s = "12geeks34"
print(s.isdecimal())

# contains numbers and spaces
s = "12 34"
print(s.isdecimal())

Output:

True
False
False

Difference between isdigit(), isnumeric() and isdecimal()

Example 1: Difference between isdigit() and isdecimal()

Here, Python String isdecimal() returns False because not all characters in the “expr” are decimal.

Python3

expr = "4²"
print("expr isdigit()?", expr.isdigit())

print("expr isdecimal()?", expr.isdecimal())

Output:

expr isdigit()? True
expr isdecimal()? False

Example 2: Difference between isnumeric() and isdecimal()

Python3

expr = "⅔"
print("expr isnumeric()?", expr.isnumeric())

print("expr isdecimal()?", expr.isdecimal())

Output:

expr isnumeric()? True
expr isdecimal()? False