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Python | Get first index values in tuple of strings

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  • Last Updated : 01 May, 2019

Yet another peculiar problem which might not be common, but can occur in python programming while playing with tuples. Since tuples are immutable, they are difficult to manipulate and hence knowledge of possible variation solutions always helps. This articles solves problem of extracting only the first index element of each string in tuple. Let’s discuss certain ways in which this problem can be solved.

Method #1 : Using list comprehension

Almost every problem can be solved using list comprehension as a shorthand to naive approach and this problem isn’t an exception. In this, we just iterate through each list picking just the 0th index element to build the resultant list.




# Python3 code to demonstrate
# Get first index values in tuple of strings
# using list comprehension
  
# initializing tuple
test_tuple = ('GfG', 'for', 'Geeks')
  
# printing original tuple 
print("The original tuple : " + str(test_tuple))
  
# using list comprehsion
# Get first index values in tuple of strings
res = list(sub[0] for sub in test_tuple)
  
# print result
print("The first index string character list : " + str(res))
Output :
The original tuple : ('GfG', 'for', 'Geeks')
The first index string character list : ['G', 'f', 'G']

 

Method #2 : Using next() + zip()

This particular task can also be performed using the combination of above two in more efficient way, using the iterators to do this task. The zip function can be used bind together the string elements.




# Python3 code to demonstrate
# Get first index values in tuple of strings
# using next() + zip()
  
# initializing tuple
test_tuple = ('GfG', 'for', 'Geeks')
  
# printing original tuple 
print("The original tuple : " + str(test_tuple))
  
# using next() + zip()
# Get first index values in tuple of strings
res = list(next(zip(*test_tuple)))
  
# print result
print("The first index string character list : " + str(res))
Output :
The original tuple : ('GfG', 'for', 'Geeks')
The first index string character list : ['G', 'f', 'G']

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