Determines whether the string contains decimal characters

## Usage

The `isdecimal()` method returns TRUE if the string is nonempty and all characters in it are decimal characters. Otherwise, it returns FALSE.

Decimal characters are those that can be used to form numbers in base 10 (0-9).

Unicode decimal character such as U+0660 (Arabic-Indic Digit Zero) is also considered as a decimal.

## Syntax

string.isdecimal()

## Basic Examples

``````# Check if all characters in the string are decimal characters
S = '123'
x = S.isdecimal()
print(x)
# Prints True``````

Below are a few examples where `isdecimal()` method returns false.

``````# floating point number
S = '123.456'
x = S.isdecimal()
print(x)
# Prints False

# number with thousands separator
S = '1,234,567'
x = S.isdecimal()
print(x)
# Prints False

# empty string
S = ''
x = S.isdecimal()
print(x)
# Prints False``````

## isdecimal() on Unicode Decimal Characters

Unicode character such as U+0660 (Arabic-Indic Digit Zero) is also considered as a decimal.

``````S = '\u0660'
x = S.isdigit()
print(x)
# Prints True``````

## isdecimal() vs isdigit() vs isnumeric()

Following examples explain the difference between the three methods.

``````# Is 42 a decimal or digit or numeric number?
print('42'.isdecimal())        # Prints True
print('42'.isdigit())          # Prints True
print('42'.isnumeric())        # Prints True``````
``````# Is ² (Superscript Two) a decimal or digit or numeric number?
print('\u00b2'.isdecimal())    # Prints False
print('\u00b2'.isdigit())      # Prints True
print('\u00b2'.isnumeric())    # Prints True``````
``````# Is ⅓ (Vulgar Fraction One Third) a decimal or digit or numeric number?
print('\u2153'.isdecimal())    # Prints False
print('\u2153'.isdigit())      # Prints False
print('\u2153'.isnumeric())    # Prints True``````

As you can see, the main difference between the three functions is:

• isdecimal() method supports only Decimal Numbers.
• isdigit() method supports Decimals, Subscripts, Superscripts.
• isnumeric() method supports Digits, Vulgar Fractions, Subscripts, Superscripts, Roman Numerals, Currency Numerators.