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Python string isdecimal() Method - GeeksforGeeks

Last Updated : 30 Dec, 2024

In Python, the isdecimal() method is a quick and easy way to check if a string contains only decimal digits. It works by returning True when the string consists of digits from 0 to 9 and False otherwise. This method is especially useful when we want to ensure that user inputs or string data are strictly numeric without any special characters or spaces.

a = "12345"
print(a.isdecimal())  # This will print True as all characters are digits

b = "12345a"
print(b.isdecimal())  # This will print False because 'a' is not a decimal character

string.isdecimal()

• The isdecimal() method does not take any parameters. It is simply called on a string object.

The method returns:

• True if all characters in the string are decimal characters (i.e., digits 0-9).
• False if any character is not a decimal character (including symbols, spaces, letters, etc.) or if the string is empty.

A string that contains a decimal point or any other non-digit characters will return False. For example, strings like "123.45" or "100,000" will fail the check because the period (.) and the comma (,) are not considered decimal digits.

e = "123.45"
print(e.isdecimal())  # False, because '.' is not a decimal character

f = "100,000"
print(f.isdecimal())  # False, because ',' is not a decimal character

The isdecimal() method does not consider spaces or symbols as decimal characters. Let’s see an example:

d = "12 34"
print(d.isdecimal())  
# This will print False because there’s a space between the numbers

There are certain numeric characters from other writing systems or formats that look like digits but are not considered decimal digits in Python. For example, the Arabic-Indic numerals or other scripts that represent numbers differently.

c = "١٢٣٤٥"  # Arabic-Indic numerals
print(c.isdecimal())  # True, because these characters are considered decimal in their script

• However, if the characters belong to a different set, like Roman numerals or fractions, the method will return False.

d = "Ⅻ"  # Roman numeral for 12
print(d.isdecimal())  # False, Roman numerals are not decimal

The isdecimal() method also returns False when the string contains negative signs (-) or other symbols like currency symbols ($, €, etc.). The presence of any non-decimal character will cause the method to return False.

g = "-12345"
print(g.isdecimal())  # False, because of the negative sign

h = "$12345"
print(h.isdecimal())  # False, because of the '$' symbol

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