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Python: Push three items into a heap and return the smallest item from the heap

Python heap queue algorithm: Exercise-22 with Solution

Write a Python program to push three items into a heap and return the smallest item from the heap. Also Pop and return the smallest item from the heap.

Sample Solution:

Python Code:

import heapq
heap = []
heapq.heappush(heap, ('V', 3))
heapq.heappush(heap, ('V', 2))
heapq.heappush(heap, ('V', 1))
print("Items in the heap:")
for a in heap:
	print(a)
print("----------------------")
print("The smallest item in the heap:")
print(heap[0])
print("----------------------")
print("Pop the smallest item in the heap:")
heapq.heappop(heap)
for a in heap:
	print(a)

Sample Output:

Items in the heap:
('V', 1)
('V', 3)
('V', 2)
----------------------
The smallest item in the heap:
('V', 1)
----------------------
Pop the smallest item in the heap:
('V', 2)
('V', 3)

Flowchart:

Python heap queue algorithm: Push three items into a heap and return the smallest item from the heap.

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Python: Tips of the Day

Creates a dictionary with the same keys as the provided dictionary and values generated by running the provided function for each value:

Example:

def tips_map_values(obj, fn):
  ret = {}
  for key in obj.keys():
    ret[key] = fn(obj[key])
  return ret
users = {
  'Owen': { 'user': 'Owen', 'age': 29 },
  'Eddie': { 'user': 'Eddie', 'age': 15 }
}

print(tips_map_values(users, lambda u : u['age'])) # {'Owen': 29, 'Eddie': 15}

Output:

{'Owen': 29, 'Eddie': 15}