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Python Exercise: Converting a list of tuples into a dictionary

Python tuple: Exercise-19 with Solution

Write a Python program to convert a list of tuples into a dictionary.

Sample Solution:-

Python Code:

#create a list
l = [("x", 1), ("x", 2), ("x", 3), ("y", 1), ("y", 2), ("z", 1)]
d = {}
for a, b in l:
    d.setdefault(a, []).append(b)
print (d)

Sample Output: 

{'y': [1, 2], 'z': [1], 'x': [1, 2, 3]}

Flowchart:

Flowchart: Converting a list of tuples into a dictionary

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Python: Tips of the Day

Returns the maximum value of a list, after mapping each element to a value using the provided function

Example:

def tips_max(lst, fn):
  return max(map(fn, lst))

print(tips_max([{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }], lambda v : v['n']))

Output:

8