Python String isdecimal()

The Python String isdecimal() method is a built-in function that returns true if all the characters in a string are decimal. If one of the characters is not decimal in the string, it returns false.

Syntax

The Syntax of isdecimal() method is:

string.isdecimal()

Parameters

The isdecimal() method does not take any parameters.

Return Value

The isdecimal() method returns

• True if all the characters in a string are valid decimal characters.
• False if one or more characters in a string are not decimal characters.

Example 1: Working of isdecimal() method in Python

# Python3 program to demonstrate the use
# of isdecimal() 
  
s = "12345"
print(s.isdecimal())
  
# contains alphabets
s = "123Hello123"
print(s.isdecimal())
  
# contains numbers and spaces
s = "12345 6789"
print(s.isdecimal())

Output

True
False
False

Example 2: String Containing digits and Numeric Characters

The superscript and subscript are considered digit characters and not decimals. If the string contains subscript or superscript the isdecimal() method will return False.

Similarly, roman numbers, currencies, and fractions are considered numeric numbers and not decimals. The isdecimal() method will return False if it finds these characters.

It is recommended to use isdigit() method and isnumeric() method to check if the characters are valid digits and numeric characters respectively.

# Python3 program to demonstrate the use
# of isdecimal() 

# vaid decimal  
s = '12345'
print(s.isdecimal())

# in case of digit
#s = '²123'
s = '\u00B2123'
print(s.isdecimal())

# incase of numeric
# s = '½'
s = '\u00BD'
print(s.isdecimal())

Output

True
False
False