Python: Create set difference
Python sets: Exercise-8 with Solution
Write a Python program to create set difference.
Sample Solution-1:
Using difference() Method
Python Code:
setc1 = set(["green", "blue"])
setc2 = set(["blue", "yellow"])
print("Original sets:")
print(setc1)
print(setc2)
r1 = setc1.difference(setc2)
print("\nDifference of setc1 - setc2:")
print(r1)
r2 = setc2.difference(setc1)
print("\nDifference of setc2 - setc1:")
print(r2)
setn1 = set([1, 1, 2, 3, 4, 5])
setn2 = set([1, 5, 6, 7, 8, 9])
print("\nOriginal sets:")
print(setn1)
print(setn2)
r1 = setn1.difference(setn2)
print("\nDifference of setn1 - setn2:")
print(r1)
r2 = setn2.difference(setn1)
print("\nDifference of setn2 - setn1:")
print(r2)
Sample Output:
Original sets: {'green', 'blue'} {'yellow', 'blue'} Difference of setc1 - setc2: {'green'} Difference of setc2 - setc1: {'yellow'} Original sets: {1, 2, 3, 4, 5} {1, 5, 6, 7, 8, 9} Difference of setn1 - setn2: {2, 3, 4} Difference of setn2 - setn1: {8, 9, 6, 7}
Pictorial Presentation:
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:
Using - Operator
Python Code:
setc1 = set(["green", "blue"])
setc2 = set(["blue", "yellow"])
print("Original sets:")
print(setc1)
print(setc2)
r1 = setc1 - setc2
print("\nDifference of setc1 - setc2:")
print(r1)
r2 = setc2 - setc1
print("\nDifference of setc2 - setc1:")
print(r2)
setn1 = set([1, 1, 2, 3, 4, 5])
setn2 = set([1, 5, 6, 7, 8, 9])
print("\nOriginal sets:")
print(setn1)
print(setn2)
r1 = setn1 - setn2
print("\nDifference of setn1 - setn2:")
print(r1)
r2 = setn2 - setn1
print("\nDifference of setn2 - setn1:")
print(r2)
Sample Output:
Original sets: {'blue', 'green'} {'yellow', 'blue'} Difference of setc1 - setc2: {'green'} Difference of setc2 - setc1: {'yellow'} Original sets: {1, 2, 3, 4, 5} {1, 5, 6, 7, 8, 9} Difference of setn1 - setn2: {2, 3, 4} Difference of setn2 - setn1: {8, 9, 6, 7}
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Sample Solution-3:
Multiple sets in the difference() method
Python Code:
setn1 = set([1, 1, 2, 3, 4, 5])
setn2 = set([1, 5, 6, 7, 8, 9])
setn3 = set([3, 4, 5, 3, 9, 10])
setn4 = set([5, 7, 9, 10, 12, 14])
print("\nOriginal sets:")
print(setn1)
print(setn2)
print(setn3)
print(setn4)
print("\nDifference of setn1 - setn2,setn3,setn4:")
r1 = setn1.difference(setn2,setn3,setn4)
print(r1)
print("\nDifference of setn4 - setn1,setn2,setn3:")
r2 = setn4.difference(setn1,setn2,setn3)
print(r2)
Sample Output:
Original sets: {1, 2, 3, 4, 5} {1, 5, 6, 7, 8, 9} {3, 4, 5, 9, 10} {5, 7, 9, 10, 12, 14} Difference of setn1 - setn2,setn3,setn4: {2} Difference of setn4 - setn1,setn2,setn3: {12, 14}
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 create a union of sets.
Next: Write a Python program to create a symmetric difference.
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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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