Python – Column Minimum in Tuple list

Sometimes, while working with records, we can have a problem in which we need to find min of all the columns of a container of lists which are tuples. This kind of application is common in web development domain. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using min() + list comprehension + zip()
This task can be performed using combination of above functions. In this, we cummulate the like index elements, i.e columns using zip(), and then iterate through them using list comprehension and perform minimum using min().

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# Python3 code to demonstrate working of
# Column Minimum in Tuple list
# using list comprehension + min() + zip()
  
# initialize list
test_list = [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
  
# printing original list
print("The original list : " + str(test_list))
  
# Column Minimum in Tuple list
# using list comprehension + min() + zip()
res = [min(ele) for ele in zip(*test_list)]
  
# printing result
print("The Cummulative column minimum is : " + str(res))

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Output :



The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column minimum is : [1, 2, 3]

 

Method #2 : Using zip() + map() + min()
This method is similar to the above method. In this, the task performed by list comprehension is performed by map(), which extends the minimum of columns to zipped elements.

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# Python3 code to demonstrate working of
# Column Minimum in Tuple list
# using zip() + map() + min()
  
# initialize list
test_list = [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
  
# printing original list
print("The original list : " + str(test_list))
  
# Column Minimum in Tuple list
# using zip() + map() + min()
res = list(map(min, zip(*test_list)))
  
# printing result
print("The Cummulative column minimum is : " + str(res))

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Output :

The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column minimum is : [1, 2, 3]



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