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Python | Convert string list into multiple cases
  • Last Updated : 18 Oct, 2019

Sometimes, while working with Python strings, we might have a problem in which we have list of strings and we wish convert them into specified cases. This problem generally occurs in the cases in which the strings we recieve are ill-cased. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using list comprehension + inbuilt functions
In this method, we use list comprehension as shortened way to perform this task rather than loop method that could span some lines of codes. The conversions are made using generic inbuilt functions that can perform interconversion tasks.




# Python3 code to demonstrate working of
# Convert string list into multiple cases
# Using inbuilt functions + list comprehension
  
# Initializing list
test_list = ['bLue', 'ReD', 'yeLLoW']
  
# printing original list
print("The original list is : " + str(test_list))
  
# Convert string list into multiple cases
# Using inbuilt functions + list comprehension
res = [(ele.upper(), ele.title(), ele.lower()) for ele in test_list]
  
# printing result
print("The list with multiple cases are : " + str(res))
Output :
The original list is : ['bLue', 'ReD', 'yeLLoW']
The list with multiple cases are : [('BLUE', 'Blue', 'blue'), ('RED', 'Red', 'red'), ('YELLOW', 'Yellow', 'yellow')]

 

Method #2 : Using map() + lambda + inbuilt functions
This is another method to perform this particular task. In this, we just perform the task of extending the logic of conversions using lambda and iterations and application to each string is done by lambda function.






# Python3 code to demonstrate working of
# Convert string list into multiple cases
# Using map() + lambda + inbuilt functions
  
# Initializing list
test_list = ['bLue', 'ReD', 'yeLLoW']
  
# printing original list
print("The original list is : " + str(test_list))
  
# Convert string list into multiple cases
# Using map() + lambda + inbuilt functions
res = list(map(lambda ele: (ele.upper(), ele.title(), ele.lower()), test_list))
  
# printing result
print("The list with multiple cases are : " + str(res))
Output :
The original list is : ['bLue', 'ReD', 'yeLLoW']
The list with multiple cases are : [('BLUE', 'Blue', 'blue'), ('RED', 'Red', 'red'), ('YELLOW', 'Yellow', 'yellow')]

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