Python String isdecimal() method “checks if all the characters in the string are decimal (0-9) characters”. If all characters in the string are decimal characters, the method returns True. Otherwise, it returns False.
Syntax
string.isdecimal()
The isdecimal() function doesn’t take any parameters. Therefore, an error will be shown if we try to pass any parameter to the method.
Return value
It returns True if the string consists only of decimals.
It returns False if the string doesn’t contain decimals or contains characters other than decimals, like numerical or special characters. When it identifies a space, then also it returns False.
Example 1
string = "123456"
print(string.isdecimal())Output
True
Example 2
string = "123456"
string2 = "123 456"
print(string.isdecimal())
print(string2.isdecimal())Output
True
False
The superscript and subscripts are considered digit characters but not decimals. If the string contains these characters (usually written using Unicode), isdecimal() returns False.
Example 3
string = "123456"
string2 = "19k21k"
string3 = "11m 21k"
print(string.isdecimal())
print(string2.isdecimal())
print(string3.isdecimal())Output
True
False
False
Similarly, roman numerals, currency numerators, and fractions are considered numeric numbers (usually written using Unicode) but not decimals. Therefore, the isdecimal() also returns False.
Two methods, isdigit() and isnumeric(), check whether the string contains digit and numeric characters, respectively.
