Python program to Sort Strings by Punctuation count

Last Updated : 11 Oct, 2020

Given the Strings list, sort by punctuations count.

Input : test_list = [“gfg@%^”, “is”, “Best!”]
Output : [‘is’, ‘Best!’, ‘gfg@%^’]
Explanation : 0 < 1 < 3, sorted by punctuation count.
Input : test_list = [“gfg@%^”, “Best!”]
Output : [ ‘Best!’, ‘gfg@%^’]
Explanation : 1 < 3, sorted by punctuation count.

Method #1 : Using string.punctuation + sort()

In this, sorting is done using sort() and punctuations are extracted from punctuation pool from string library. Performs inplace sort.

Python3

# Python3 code to demonstrate working of 
# Sort Strings by Punctuation count
# Using string.punctuation + sort()
from string import punctuation
  
def get_pnc_count(strng):
      
    # getting punctuation count
    return len([ele for ele in strng if ele in punctuation])
  
# initializing list
test_list = ["gfg@%^", "is", "Best!", "fo@#r", "@#$ge24eks!"]
  
# printing original list
print("The original list is : " + str(test_list))
  
# performing inplace sort 
test_list.sort(key = get_pnc_count)
  
# printing result 
print("Sorted Strings list : " + str(test_list))

Output:

The original list is : [‘gfg@%^’, ‘is’, ‘Best!’, ‘fo@#r’, ‘@#$ge24eks!’]
Sorted Strings list : [‘is’, ‘Best!’, ‘fo@#r’, ‘gfg@%^’, ‘@#$ge24eks!’]

Method #2 : Using sorted() + punctuation + lambda

In this, we perform sort using sorted() using lambda to avoid external function to perform task of filtering punctuations extracted using punctuation.

Python3

# Python3 code to demonstrate working of
# Sort Strings by Punctuation count
# Using sorted() + punctuation + lambda
from string import punctuation
  
# initializing list
test_list = ["gfg@%^", "is", "Best!", "fo@#r", "@#$ge24eks!"]
  
# printing original list
print("The original list is : " + str(test_list))
  
# performing sort using sorted() with lambda
# function for filtering
res = sorted(test_list, key=lambda strng: len(
    [ele for ele in strng if ele in punctuation]))
  
# printing result
print("Sorted Strings list : " + str(res))

Output:

The original list is : [‘gfg@%^’, ‘is’, ‘Best!’, ‘fo@#r’, ‘@#$ge24eks!’]
Sorted Strings list : [‘is’, ‘Best!’, ‘fo@#r’, ‘gfg@%^’, ‘@#$ge24eks!’]

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course

My Personal Notes

Related Articles

Python3

Python3