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Python: Create a FIFO queue

Python heap queue algorithm: Exercise-28 with Solution

Write a Python program to create a FIFO queue.

Sample Solution:

Python Code:

import queue
q = queue.Queue()
#insert items at the end of the queue 
for x in range(4):
    q.put(str(x))
#remove items from the head of the queue 
while not q.empty():
    print(q.get(), end=" ")
print("\n")

Sample Output:

0 1 2 3

Flowchart:

Python heap queue algorithm: Create a FIFO queue.

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Python Code Editor:

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Previous: Write a Python program to find whether a queue is empty or not.

Next: Write a Python program to create a LIFO queue.

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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