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Python: Delete the smallest element from the given Heap and then inserts a new item

Python heap queue algorithm: Exercise-5 with Solution

Write a Python program to delete the smallest element from the given Heap and then inserts a new item.

Sample Solution:

Python Code:

import heapq as hq

heap = [25, 44, 68, 21, 39, 23, 89]
hq.heapify(heap)
print("heap: ", heap)
hq.heapreplace(heap, 21)
print("heapreplace(heap, 21): ", heap)
hq.heapreplace(heap, 110)
print("heapreplace(heap, 110): ", heap)

Sample Output:

heap:  [21, 25, 23, 44, 39, 68, 89]
heapreplace(heap, 21):  [21, 25, 23, 44, 39, 68, 89]
heapreplace(heap, 110):  [23, 25, 68, 44, 39, 110, 89]

Flowchart:

Python heap queue algorithm: Delete the smallest element from the given Heap and then inserts a new item.

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Previous: Write a Python function which accepts an arbitrary list and converts it to a heap using Heap queue algorithm.
Next: Write a Python program to sort a given list of elements in ascending order using Heap queue algorithm.

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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