﻿ Python: Create set difference - w3resource # 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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## Python: Tips of the Day

While-else construct:

```i = 5

while i > 1:
print("Whil-ing away!")
i -= 1
if i == 3:
break
else:
print("Finished up!")
```