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Python – Conditional String Append
  • Last Updated : 01 Mar, 2020

Sometimes, while working with data, we have a problem in which we need to perform append operation in string on a particular condition. This kind of problem is common in web development and day-day programming. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is brute force way to perform this task. In this, we run a loop and check for the condition and according to that append the string to original string.




# Python3 code to demonstrate 
# Conditional String Append
# using loop
  
def append_str(item, boy_str, girl_str):
    if len(item) > 4 and item[-5] == ' ':
        return item + girl_str
    return item + boy_str
      
# initializing list 
test_list = ['Manjeet Singh', 'Harsimran Kaur', 'Sarbjeet Kaur']
  
# initializing append string 
boy_str = " Boy"
girl_str = " Girl"
  
# printing original list
print ("The original list is : " + str(test_list))
  
# Conditional String Append
# using loop
res = [append_str(item, boy_str, girl_str) for item in test_list]
  
# printing result 
print ("The filtered strings are : " + str(res))
Output :
The original list is : ['Manjeet Singh', 'Harsimran Kaur', 'Sarbjeet Kaur']
The filtered strings are : ['Manjeet Singh Boy', 'Harsimran Kaur Girl', 'Sarbjeet Kaur Girl']

 

Method #2 : Using list comprehension
List comprehension is shorthand to longer method of loops. This solved problem in similar way but in shorter constructs.






# Python3 code to demonstrate 
# Conditional String Append
# using list comprehension
  
# initializing list 
test_list = ['Manjeet Singh', 'Harsimran Kaur', 'Sarbjeet Kaur']
  
# initializing append string 
boy_str = " Boy"
girl_str = " Girl"
  
# printing original list
print ("The original list is : " + str(test_list))
  
# Conditional String Append
# using list comprehension
res = [ele + girl_str if ele[-5] == ' ' else ele + boy_str for ele in test_list]
  
# printing result 
print ("The filtered strings are : " + str(res))
Output :
The original list is : ['Manjeet Singh', 'Harsimran Kaur', 'Sarbjeet Kaur']
The filtered strings are : ['Manjeet Singh Boy', 'Harsimran Kaur Girl', 'Sarbjeet Kaur Girl']

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