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Python: Calculate the maximum aggregate from the list of tuples (pairs)

Python Collections: Exercise-24 with Solution

Write a Python program to calculate the maximum aggregate from the list of tuples (pairs).

Sample Solution:

Python Code:

from collections import defaultdict
def max_aggregate(st_data):
    temp = defaultdict(int)
    for name, marks in st_data:
        temp[name] += marks
    return max(temp.items(), key=lambda x: x[1])


students = [('Juan Whelan',90),('Sabah Colley',88),('Peter Nichols',7),('Juan Whelan',122),('Sabah Colley',84)]
print("Original list:")
print(students)
print("\nMaximum aggregate value of the said list of tuple pair:")
print(max_aggregate(students))

Sample Output:

Original list:
[('Juan Whelan', 90), ('Sabah Colley', 88), ('Peter Nichols', 7), ('Juan Whelan', 122), ('Sabah Colley', 84)]

Maximum aggregate value of the said list of tuple pair:
('Juan Whelan', 212)

Flowchart:

Python Collections: Calculate the maximum aggregate from the list of tuples (pairs).

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Previous: Write a Python program to get the frequency of the tuples in a given list.
Next: Write a Python program to find the characters in a list of strings which occur more than and less than a given number.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m