Python: Push an item on the heap, then pop and return the smallest item from the heap
Python heap queue algorithm: Exercise-23 with Solution
Write a Python program to push an item on the heap, then 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("Using heappushpop push item on the heap and return the smallest item.")
heapq.heappushpop(heap, ('V', 6))
for a in heap:
print(a)
Sample Output:
Items in the heap: ('V', 1) ('V', 3) ('V', 2) ---------------------- Using heappushpop push item on the heap and return the smallest item. ('V', 2) ('V', 3) ('V', 6)
Flowchart:
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Python Code Editor:
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
Previous: 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.
Next: Write a Python program to create a heapsort, pushing all values onto a heap and then popping off the smallest values one at a time.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
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
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework