Python: Merge multiple sorted inputs into a single sorted iterator (over the sorted values) using Heap queue algorithm
Python heap queue algorithm: Exercise-11 with Solution
Write a Python program to merge multiple sorted inputs into a single sorted iterator (over the sorted values) using Heap queue algorithm.
Sample Solution:
Python Code:
import heapq
num1 = [25, 24, 15, 4, 5, 29, 110]
num2 = [19, 20, 11, 56, 25, 233, 154]
num3 = [24, 26, 54, 48]
num1 = sorted(num1)
num2 = sorted(num2)
num3 = sorted(num3)
result = heapq.merge(num1, num2, num3)
print(list(result))
Sample Output:
[4, 5, 11, 15, 19, 20, 24, 24, 25, 25, 26, 29, 48, 54, 56, 110, 154, 233]
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Previous: Write a Python program to get the n expensive and cheap price items from a given dataset using Heap queue algorithm.
Next: Given a n x n matrix where each of the rows and columns are sorted in ascending order, write a Python program to find the kth smallest element in the matrix.
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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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