# Python String isdecimal()

Filed Under: Python String

Python String isdecimal() function returns `True` if all the characters in the string are decimal characters, otherwise False. If the string is empty then this function returns False. ## Python String isdecimal()

If a character can be used to form a number in base 10, then it’s considered as decimal character. For example, ٠ (U+0660, ARABIC-INDIC DIGIT ZERO) and ? (U+1D7DC, MATHEMATICAL DOUBLE-STRUCK DIGIT FOUR) are also treated as decimal characters.

Let’s look at some of the examples of isdecimal() function.

``````
s = '100'

print(s.isdecimal())
``````

Output: `True` because all the characters in the string are decimals.

``````
s = '0xF'
print(s.isdecimal())
``````

Output: `False` because the string characters are not decimal and can’t be used to represent a number in base 10.

``````
s = '10.55'
print(s.isdecimal())
``````

Output: `False` because dot character is not a decimal character.

``````
s = ''
print(s.isdecimal())
``````

Output: `False` because string is empty.

``````
s = '1٠2?'  # U+0660, U+1D7DC
print(s.isdecimal())
print(int(s))
``````

Output:

``````
True
1024
``````

## Printing all Decimal characters in Python

We can use `unicode` module to check if a character is decimal or not. Here is the program to print all the decimal Unicode characters.

``````
import unicodedata

count = 0
for codepoint in range(2 ** 16):
ch = chr(codepoint)
if ch.isdecimal():
print(u'{:04x}: {} ({})'.format(codepoint, ch, unicodedata.name(ch, 'UNNAMED')))
count = count + 1
print(f'Total Number of Decimal Unicode Characters = {count}')
``````

Output:

``````
...
ff15: ５ (FULLWIDTH DIGIT FIVE)
ff16: ６ (FULLWIDTH DIGIT SIX)
ff17: ７ (FULLWIDTH DIGIT SEVEN)
ff18: ８ (FULLWIDTH DIGIT EIGHT)
ff19: ９ (FULLWIDTH DIGIT NINE)
Total Number of Decimal Unicode Characters = 370
``````

I have provided only partial output because the number of decimal Unicode characters is huge.

You can checkout more Python examples from our GitHub Repository.

Reference: Official Documentation

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