Python string isnumeric() usage and example

Python string methods

If all characters in the string are numeric characters, the isnumeric() method will return True. If not, it will return False.

Numeric characters have the following properties:

• Numeric_Type = decimal

• Numeric_Type = 数字（Digit）

• Numeric_Type = 数字（Numeric）

In Python, decimal characters (such as: 0,1,2 ..), numbers (such as: subscripts, superscripts) and characters with Unicode numeric properties (such as: decimals, Roman numerals, currency numerators) are considered numeric characters.

You can use unicode to write numbers and numeric characters in the program. For example:

# s = '½'
s = '\u00BD'

The syntax of isnumeric() is

string.isnumeric()

isnumeric() parameters

isnumeric() method without any parameters

isnumeric() return value

The isnumeric() method returns:

• True If all characters in the string are numeric characters.

• False If at least one character is not a numeric character.

Example1How does isnumeric() work?

s = '1242323'
print(s.isnumeric())
#s = '²3455'
s = '\u00B23455'
print(s.isnumeric())
# s = '½'
s = '\u00BD'
print(s.isnumeric())
s = '1242323'
s='python12'
print(s.isnumeric())

When running the program, the output is:

True
True
True
False

Example2How to use isnumeric()?

#s = '²3455'
s = '\u00B23455'
if s.isnumeric() == True:
　　print('All characters are numbers.')
else:
　　print('Not all characters are numbers.')

When running the program, the output is:

Not all characters are numbers.

Python string methods