Python program to extract maximum value in record list as tuple attribute

Method 1:

One combination of methods in python that can perform the task is finding the maximum of each record using the max() method and extracting it using list comprehension by iterating the list of tuples.

# Python program to extract maximum value 
# in record list as record 

# Initializing and printing list of tuples
tupList = [('java', [4, 3, 8, 9]), ('python', [7, 1, 4, 2]), ('scala' , [4, 5, 6, 11])]
print("The elements of list of  tuples are " + str(tupList))

# Extracting maximum value from each record 
# using max() method with list comphrehension 
maxList = [(key, max(rec)) for key, rec in tupList]

# Printing maximum record value list 
print("The extracted values from the list of tuple are " + str(maxList))

Output:

The elements of list of  tuples are [('java', [4, 3, 8, 9]), ('python', [7, 1, 4, 2]), ('scala', [4, 5, 6, 11])]
The extracted values from the list of tuple are [('java', 9), ('python', 7), ('scala', 11)]

Method 2:

One more combination that can be employed is mapping the list which uses a lambda function to extract tuple with value and maximum of record extracted using the the max() method.

# Python program to extract maximum value 
# in record list as record 

# Initializing and printing list of tuples
tupList = [('java', [4, 3, 8, 9]), ('python', [7, 1, 4, 2]), ('scala' , [4, 5, 6, 11])]
print("The elements of list of  tuples are " + str(tupList))

# Extracting maximum value from each record 
# using max() method with list comphrehension 
maxList = list(map(lambda tup: (tup[0], max(tup[1])), tupList))

# Printing maximum record value list 
print("The extracted values from the list of tuple are " + str(maxList))

Output:

The elements of list of  tuples are [('java', [4, 3, 8, 9]), ('python', [7, 1, 4, 2]), ('scala', [4, 5, 6, 11])]
The extracted values from the list of tuple are [('java', 9), ('python', 7), ('scala', 11)]