Python - String isnumeric() Method

The isnumeric() string method returns True if all the characters in a string are numerics, otherwise it returns False.

Note : None of the string methods change the original string and only return a new string which reflects the change performed by the string method, hence the returned string must be stored or used(if needed to reflect the result), otherwise it is lost.

Signature of isnumeric()

The isnumeric() method has no parameters, so we don't have to worry about passing it some value.

# Signature of isnumeric() method 
isnumeric()

Calling isnumeric() method on a string object.

isnumeric()

# Python - Method isnumeric() Example



# Creating the first string
s1 = ('I Love Minions')

# Printing the first string
print('The first string : ', s1)

# Calling  the isnumeric() method on first string object 
print('isnumeric() method on first string : ', s1.isnumeric())



# Creating the second string
s2 = ('It took me 7 days to reach the summit')

# Printing the second string
print('The second string : ', s2)

# Calling  the isnumeric() method on second string object 
print('isnumeric() method on second string : ', s2.isnumeric())



# Creating the third string
s3 = ('3...2...1!')

# Printing the third string
print('The third string : ', s3)

# Calling  the isnumeric() method on third string object 
print('isnumeric() method on third string : ', s3.isnumeric())



# Creating the fourth string
s4 = ('463321')

# Printing the fourth string
print('The fourth string : ', s4)

# Calling  the isnumeric() method on fourth string object 
print('isnumeric() method on fourth string : ', s4.isnumeric())

Output

The first string :  I Love Minions
isnumeric() method on first string :  False
The second string :  It took me 7 days to reach the summit
isnumeric() method on second string :  False
The third string :  3...2...1!
isnumeric() method on third string :  False
The fourth string :  463321
isnumeric() method on fourth string :  True

Program Analysis

Calling the isnumeric() on the first string of all characters, returns False.
Calling the isnumeric() on the second string of all characters(except 1 digit), returns False.
Calling the isnumeric() on the third string of all digits(except dot characters), returns False.
Calling the isnumeric() on the fourth string of all digits, returns True.

Another example of isnumeric() method

Let us see a few more examples of calling the isnumeric() method on all different forms of strings.

# Python - Method isnumeric() Example



# Calling isnumeric() method on a string of digits with a comma
print('123,456'.isnumeric())


# Calling isnumeric() method on a string repesenting a specific currency value
print('5.43$'.isnumeric())



# Calling isnumeric() method on a string representing a floating value
print('12.99'.isnumeric())



# Calling isnumeric() method on a string of all digits except a !
print('999!'.isnumeric())


# Calling isnumeric() method of all binary digits
print('01011'.isnumeric())

Output is :

False
False
False
False
True

Program Analysis

Calling the isnumeric() on the first string representing digits with a comma, returns False.
Calling the isnumeric() on the second string representing a currency value, returns False.
Calling the isnumeric() on the third string representing a floating value, returns False.
Calling the isnumeric() on the fourth string of all digits, except a 1, returns True.
Calling the isnumeric() on the first string of all binary digits, returns True.