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Python | Convert case of elements in a list of strings

  • Last Updated : 13 Feb, 2019

Given a list of strings, write a Python program to convert all string from lowercase/uppercase to uppercase/lowercase.

Input : ['GeEk', 'FOR', 'gEEKS']
Output: ['geeks', 'for', 'geeks']

Input : ['fun', 'Foo', 'BaR']
Output: ['FUN', 'FOO', 'BAR']

 
Method #1 : Convert Uppercase to Lowercase using map function

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# Python code to convert all string
# from uppercase to lowercase.
  
# Using map function
out = map(lambda x:x.lower(), ['GeEk', 'FOR', 'gEEKS'])
  
# Converting it into list
output = list(out)
  
# printing output
print(output)
Output:
['geek', 'for', 'geeks']

 
Method #2: Convert Lowercase to Uppercase using List comprehension




# Python code to convert all string
# from uppercase to lowercase.
  
# Initialisation
input = ['fun', 'Foo', 'BaR']
  
# Converting
lst = [x.upper() for x in input]
  
# printing output
print(lst)
Output:
['FUN', 'FOO', 'BAR']
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