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Python | Extract digits from given string

  • Last Updated : 08 Feb, 2022

While programming, sometimes, we just require a certain type of data and need to discard other. This type of problem is quite common in Data Science domain, and since Data Science uses Python worldwide, its important to know how to extract specific elements. This article discusses certain ways in which only digit can be extracted. Let’s discuss the same.
Method #1 : Using join() + isdigit() + filter()
This task can be performed using the combination of above functions. The filter function filters the digits detected by the isdigit function and join function performs the task of reconstruction of join function. 
 

Python3




# Python3 code to demonstrate
# Extract digit string
# using join() + isdigit() + filter()
 
# initializing string
test_string = 'g1eeks4geeks5'
 
# printing original strings 
print("The original string : " + test_string)
 
# using join() + isdigit() + filter()
# Extract digit string
res = ''.join(filter(lambda i: i.isdigit(), test_string))
     
# print result
print("The digits string is : " + str(res))
Output : 
The original string : g1eeks4geeks5
The digits string is : 145

 

 
Method #2 : Using re 
The regular expressions can also be used to perform this particular task. We can define the digit type requirement, using “\D”, and only digits are extracted from the string.
 

Python3




# Python3 code to demonstrate
# Extract digit string
# using re
import re
 
# initializing string
test_string = 'g1eeks4geeks5'
 
# printing original strings 
print("The original string : " + test_string)
 
# using re
# Extract digit string
res = re.sub("\D", "", test_string)
     
# print result
print("The digits string is : " + str(res))
Output : 
The original string : g1eeks4geeks5
The digits string is : 145

 

Method 3: Using loops:

This task is done by using for loop.

Python3




# Python3 code to demonstrate
# Extract digit string
s="g1eeks4geeks5"
#using for loop
for i in s:
  # using isdigit() function
  if(i.isdigit()):
    print(i,end="")
Output:
The original string : g1eeks4geeks5
The digits string is : 145

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