Python – Conditional String Append
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 listprint ("The original list is : " + str(test_list)) # Conditional String Append# using loopres = [append_str(item, boy_str, girl_str) for item in test_list] # printing result print ("The filtered strings are : " + str(res)) |
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 listprint ("The original list is : " + str(test_list)) # Conditional String Append# using list comprehensionres = [ele + girl_str if ele[-5] == ' ' else ele + boy_str for ele in test_list] # printing result print ("The filtered strings are : " + str(res)) |
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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