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Python Loops
course content

Course Content

Python Loops

Python Loops

1. While Loops: Get Started
Simple While LoopChallenge 1Challenge 2
2. While Loops: Essentials
Infinite LoopsChallengeBreakContinueElseChallenge
3. For Loops
Simple For Loopsrange()enumerate()zip()
4. Nested Loops
Nested LoopsBreak and Continue with Nested LoopsChallenge

bookrange()

range() is a special function that generates range of numbers. range() has three parameters:

range(start, end, step) - returns the numbers starting from start up to end (exclusive) with the step step.

Examples

range(1, 10, 1): returns (1, 2, 3, 4, 5, 6, 7, 8, 9).

range(-3, 4, 3): returns (-3, 0, 3).

range(22, 22, 1): returns empty range.

You can also use such a range() functions:

  • range(end): the shorter version of range(0, end, 1)
  • range(start, end): the shorter version of range(start, end, 1).

Run the following examples to see the loop iteration.


              
12345678

            
for i in range(8):
  print(i)

for i in range(7, -1, -1):
  print(i)

for i in range(1, 11, 2):
  print(i)
copy

Using range() in for loop condition helps to specify the start and end conditions, however set a step. By the way, variable that stores the value (here is an i) shouldn't be defined before the loop. It exists only inside the loop.

Negative step

What happens if pass negative value of step? Actually, still the same: generates range of numbers starting with start decreasing down to end (still exclusive). The code to generate odd numbers between 8 and 20 in descending order:


              
12

            
for i in range(20, 8, -2):
  print(i)
copy

Task

Output the list in reverse order using for loop and range(): iterate from the last symbol to the first one. Output each symbol separately on each line.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 3. Chapter 2
toggle bottom row

bookrange()

range() is a special function that generates range of numbers. range() has three parameters:

range(start, end, step) - returns the numbers starting from start up to end (exclusive) with the step step.

Examples

range(1, 10, 1): returns (1, 2, 3, 4, 5, 6, 7, 8, 9).

range(-3, 4, 3): returns (-3, 0, 3).

range(22, 22, 1): returns empty range.

You can also use such a range() functions:

  • range(end): the shorter version of range(0, end, 1)
  • range(start, end): the shorter version of range(start, end, 1).

Run the following examples to see the loop iteration.


              
12345678

            
for i in range(8):
  print(i)

for i in range(7, -1, -1):
  print(i)

for i in range(1, 11, 2):
  print(i)
copy

Using range() in for loop condition helps to specify the start and end conditions, however set a step. By the way, variable that stores the value (here is an i) shouldn't be defined before the loop. It exists only inside the loop.

Negative step

What happens if pass negative value of step? Actually, still the same: generates range of numbers starting with start decreasing down to end (still exclusive). The code to generate odd numbers between 8 and 20 in descending order:


              
12

            
for i in range(20, 8, -2):
  print(i)
copy

Task

Output the list in reverse order using for loop and range(): iterate from the last symbol to the first one. Output each symbol separately on each line.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 3. Chapter 2
toggle bottom row

bookrange()

range() is a special function that generates range of numbers. range() has three parameters:

range(start, end, step) - returns the numbers starting from start up to end (exclusive) with the step step.

Examples

range(1, 10, 1): returns (1, 2, 3, 4, 5, 6, 7, 8, 9).

range(-3, 4, 3): returns (-3, 0, 3).

range(22, 22, 1): returns empty range.

You can also use such a range() functions:

  • range(end): the shorter version of range(0, end, 1)
  • range(start, end): the shorter version of range(start, end, 1).

Run the following examples to see the loop iteration.


              
12345678

            
for i in range(8):
  print(i)

for i in range(7, -1, -1):
  print(i)

for i in range(1, 11, 2):
  print(i)
copy

Using range() in for loop condition helps to specify the start and end conditions, however set a step. By the way, variable that stores the value (here is an i) shouldn't be defined before the loop. It exists only inside the loop.

Negative step

What happens if pass negative value of step? Actually, still the same: generates range of numbers starting with start decreasing down to end (still exclusive). The code to generate odd numbers between 8 and 20 in descending order:


              
12

            
for i in range(20, 8, -2):
  print(i)
copy

Task

Output the list in reverse order using for loop and range(): iterate from the last symbol to the first one. Output each symbol separately on each line.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

range() is a special function that generates range of numbers. range() has three parameters:

range(start, end, step) - returns the numbers starting from start up to end (exclusive) with the step step.

Examples

range(1, 10, 1): returns (1, 2, 3, 4, 5, 6, 7, 8, 9).

range(-3, 4, 3): returns (-3, 0, 3).

range(22, 22, 1): returns empty range.

You can also use such a range() functions:

  • range(end): the shorter version of range(0, end, 1)
  • range(start, end): the shorter version of range(start, end, 1).

Run the following examples to see the loop iteration.


              
12345678

            
for i in range(8):
  print(i)

for i in range(7, -1, -1):
  print(i)

for i in range(1, 11, 2):
  print(i)
copy

Using range() in for loop condition helps to specify the start and end conditions, however set a step. By the way, variable that stores the value (here is an i) shouldn't be defined before the loop. It exists only inside the loop.

Negative step

What happens if pass negative value of step? Actually, still the same: generates range of numbers starting with start decreasing down to end (still exclusive). The code to generate odd numbers between 8 and 20 in descending order:


              
12

            
for i in range(20, 8, -2):
  print(i)
copy

Task

Output the list in reverse order using for loop and range(): iterate from the last symbol to the first one. Output each symbol separately on each line.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 3. Chapter 2
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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