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Python Loops Tutorial
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Course Content

Python Loops Tutorial

Python Loops Tutorial

1. The for Loop
The first for LoopRange() in a for Loop 1/2Range() in a for Loop 2/2List & for LoopIf/Else in a for LoopBreak/Continue in a for LoopPass, Else in a for LoopEnumerate() in a for LoopChallenge
2. The while Loop
The First while LoopInfinite LoopList & while LoopIf/Else in a while LoopBreak/Continue in a while LoopPass, Else in a while Loop
3. Nested Loops
First Nested Loop PatternNested for LoopNested while LoopWhile Loop inside a for LoopIf/Else in a Nested LoopBreak/Continue in a Nested LoopChallenge

bookRange() in a for Loop 1/2

Imagine that we wish to print numbers from 1 to 100. Naturally, we could do this manually:

But that would be incredibly time-consuming!

If we had to print numbers from 1 to 1,000,000, we'd be counting manually for the rest of our lives!

To tackle this challenge, we'll employ the for loop in conjunction with the range() function!

Take a look at the following code:


              
123

            
# Printing all numbers from 0 to 100
for i in range(101):
  print(i)
copy

How does the code work?

The range() function provides a sequence of numbers that starts at 0 (by default) when the initial limit is unspecified. It increments by 1 (by default) until it reaches a final limit (the final limit itself is not included).

The format of the range() function is: range(start, end, step).

If our intention is to operate with decreasing numbers, we can achieve this by inputting a negative step argument into the range() function.

Look at the code below:


              
123456789

            
# Increasing
# Printing numbers from 0 to 10
for i in range(0, 11, 1):
  print(i)

# Decreasing
# Printing numbers from 10 to 0
for i in range(10, -1, -1):
  print(i)
copy

Task

Print numbers from -1 to -5, follow these steps:

  1. Configure the for loop to display decreasing numbers from -1 to -5.
  2. Print each number within the loop.

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 1. Chapter 2
toggle bottom row

bookRange() in a for Loop 1/2

Imagine that we wish to print numbers from 1 to 100. Naturally, we could do this manually:

But that would be incredibly time-consuming!

If we had to print numbers from 1 to 1,000,000, we'd be counting manually for the rest of our lives!

To tackle this challenge, we'll employ the for loop in conjunction with the range() function!

Take a look at the following code:


              
123

            
# Printing all numbers from 0 to 100
for i in range(101):
  print(i)
copy

How does the code work?

The range() function provides a sequence of numbers that starts at 0 (by default) when the initial limit is unspecified. It increments by 1 (by default) until it reaches a final limit (the final limit itself is not included).

The format of the range() function is: range(start, end, step).

If our intention is to operate with decreasing numbers, we can achieve this by inputting a negative step argument into the range() function.

Look at the code below:


              
123456789

            
# Increasing
# Printing numbers from 0 to 10
for i in range(0, 11, 1):
  print(i)

# Decreasing
# Printing numbers from 10 to 0
for i in range(10, -1, -1):
  print(i)
copy

Task

Print numbers from -1 to -5, follow these steps:

  1. Configure the for loop to display decreasing numbers from -1 to -5.
  2. Print each number within the loop.

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 1. Chapter 2
toggle bottom row

bookRange() in a for Loop 1/2

Imagine that we wish to print numbers from 1 to 100. Naturally, we could do this manually:

But that would be incredibly time-consuming!

If we had to print numbers from 1 to 1,000,000, we'd be counting manually for the rest of our lives!

To tackle this challenge, we'll employ the for loop in conjunction with the range() function!

Take a look at the following code:


              
123

            
# Printing all numbers from 0 to 100
for i in range(101):
  print(i)
copy

How does the code work?

The range() function provides a sequence of numbers that starts at 0 (by default) when the initial limit is unspecified. It increments by 1 (by default) until it reaches a final limit (the final limit itself is not included).

The format of the range() function is: range(start, end, step).

If our intention is to operate with decreasing numbers, we can achieve this by inputting a negative step argument into the range() function.

Look at the code below:


              
123456789

            
# Increasing
# Printing numbers from 0 to 10
for i in range(0, 11, 1):
  print(i)

# Decreasing
# Printing numbers from 10 to 0
for i in range(10, -1, -1):
  print(i)
copy

Task

Print numbers from -1 to -5, follow these steps:

  1. Configure the for loop to display decreasing numbers from -1 to -5.
  2. Print each number within the loop.

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!

Imagine that we wish to print numbers from 1 to 100. Naturally, we could do this manually:

But that would be incredibly time-consuming!

If we had to print numbers from 1 to 1,000,000, we'd be counting manually for the rest of our lives!

To tackle this challenge, we'll employ the for loop in conjunction with the range() function!

Take a look at the following code:


              
123

            
# Printing all numbers from 0 to 100
for i in range(101):
  print(i)
copy

How does the code work?

The range() function provides a sequence of numbers that starts at 0 (by default) when the initial limit is unspecified. It increments by 1 (by default) until it reaches a final limit (the final limit itself is not included).

The format of the range() function is: range(start, end, step).

If our intention is to operate with decreasing numbers, we can achieve this by inputting a negative step argument into the range() function.

Look at the code below:


              
123456789

            
# Increasing
# Printing numbers from 0 to 10
for i in range(0, 11, 1):
  print(i)

# Decreasing
# Printing numbers from 10 to 0
for i in range(10, -1, -1):
  print(i)
copy

Task

Print numbers from -1 to -5, follow these steps:

  1. Configure the for loop to display decreasing numbers from -1 to -5.
  2. Print each number within the loop.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 1. 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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