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Python: Iterate over two lists simultaneously

Python List: Exercise - 64 with Solution

Write a Python program to iterate over two lists simultaneously.

Sample Solution-1:

Python Code:

num = [1, 2, 3]
color = ['red', 'white', 'black']
for (a,b) in zip(num, color):
     print(a, b)

Sample Output: 

1 red                                                                                                         
2 white                                                                                                       
3 black

Pictorial Presentation:

Python List: Iterate over two lists simultaneously.

Flowchart:

Flowchart: Iterate over two lists simultaneously

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-2:

Python Code:

def print_itr(itr1, itr2, fn):
    for (itr1, itr2) in zip(num, color):
     fn(itr1, itr2)     
num = [1, 2, 3]
color = ['red', 'white', 'black']
print_itr(num, color, print)

Sample Output: 

1 red
2 white
3 black

Flowchart:

Flowchart: Iterate over two lists simultaneously

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:

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Previous: Write a Python program to insert a given string at the beginning of all items in a list.
Next: Write a Python program to move all zero digits to end of a given list of numbers.

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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