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Python: Print out a set containing all the colors from a list which are not present in other list

Python Basic: Exercise-29 with Solution

Write a Python program to print out a set containing all the colors from color_list_1 which are not present in color_list_2.

Test Data:
color_list_1 = set(["White", "Black", "Red"])
color_list_2 = set(["Red", "Green"])
Expected Output :
{'Black', 'White'}

Pictorial Presentation:

Print out a set containing all the colors from a list which are not present in other list

Sample Solution-1:

Python Code:

color_list_1 = set(["White", "Black", "Red"])
color_list_2 = set(["Red", "Green"])
print("Original set elements:")
print(color_list_1)
print(color_list_2)
print("\nDifferenct of color_list_1 and color_list_2:")
print(color_list_1.difference(color_list_2))
print("\nDifferenct of color_list_2 and color_list_1:")
print(color_list_2.difference(color_list_1))

Sample Output:

Original set elements:
{'White', 'Black', 'Red'}
{'Green', 'Red'}

Differenct of color_list_1 and color_list_2:
{'White', 'Black'}

Differenct of color_list_2 and color_list_1:
{'Green'}

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:

color_list_1 = set(["White", "Black", "Red"])
color_list_2 = set(["Red", "Green"])
print("Original set elements:")
print(color_list_1)
print(color_list_2)
print("\nDifferenct of color_list_1 and color_list_2:")
print(color_list_1 - color_list_2)
print("\nDifferenct of color_list_2 and color_list_1:")
print(color_list_2 - color_list_1)

Sample Output:

Original set elements:
{'Red', 'Black', 'White'}
{'Red', 'Green'}

Differenct of color_list_1 and color_list_2:
{'Black', 'White'}

Differenct of color_list_2 and color_list_1:
{'Green'}

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 print out all even numbers from a given numbers list in the same order and stop the printing if any numbers that come after 237 in the sequence.
Next: Write a Python program that will accept the base and height of a triangle and compute the area.

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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