Python: Create a heapsort, pushing all values onto a heap and then popping off the smallest values one at a time
Python heap queue algorithm: Exercise-24 with Solution
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.
Sample Solution:
Python Code:
import heapq
def heapsort(h):
heap = []
for value in h:
heapq.heappush(heap, value)
return [heapq.heappop(heap) for i in range(len(heap))]
print(heapsort([10, 20, 50, 70, 90, 20, 50, 40, 60, 80, 100]))
Sample Output:
[10, 20, 20, 40, 50, 50, 60, 70, 80, 90, 100]
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Previous: Write a Python program to push an item on the heap, then pop and return the smallest item from the heap.
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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
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