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Python Loops Tutorial
course content

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

bookNested while Loop

To summarize, the while loop statement executes a code block repeatedly as long as a specific condition remains True. We opt for a while loop when the number of iterations isn't predetermined.

Now, let's delve into employing a while loop within another while loop.

Examine the code below:


              
1234567891011

            
# Printing numbers from 0 to 4 for 5 times
i = 0
# Setting outer while loop
while i < 5:
  j = 0
  # Setting inner while loop
  while j < 5:
    print(j, end='')
    j += 1
  i += 1
  print('')
copy

How does the code work?

In the previous section, we worked with a matrix. We can achieve the same using a nested while loop!

Examine the code below:


              
1234567891011121314

            
matrix = [ [1, 2, 4, 29],
           [3, 4, 6, 1] ]

# Printing all elements of the matrix
i = 0
# Setting outer while loop to work with the number of rows
while i < len(matrix):
  j = 0
  # Setting inner while loop to work with the number of elements in the row
  while j < len(matrix[i]):
    print(matrix[i][j], end = ' ')
    j +=1
  i += 1
  print('')
copy

How does the code work?

Task

Increment every element in the matrix by 1.

  1. Configure the outer while loop to iterate through each row in the matrix.
  2. Configure the inner while loop to iterate through each element in the row of the matrix.
  3. Add 1 to every element.
  4. Display each updated element.

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 3
toggle bottom row

bookNested while Loop

To summarize, the while loop statement executes a code block repeatedly as long as a specific condition remains True. We opt for a while loop when the number of iterations isn't predetermined.

Now, let's delve into employing a while loop within another while loop.

Examine the code below:


              
1234567891011

            
# Printing numbers from 0 to 4 for 5 times
i = 0
# Setting outer while loop
while i < 5:
  j = 0
  # Setting inner while loop
  while j < 5:
    print(j, end='')
    j += 1
  i += 1
  print('')
copy

How does the code work?

In the previous section, we worked with a matrix. We can achieve the same using a nested while loop!

Examine the code below:


              
1234567891011121314

            
matrix = [ [1, 2, 4, 29],
           [3, 4, 6, 1] ]

# Printing all elements of the matrix
i = 0
# Setting outer while loop to work with the number of rows
while i < len(matrix):
  j = 0
  # Setting inner while loop to work with the number of elements in the row
  while j < len(matrix[i]):
    print(matrix[i][j], end = ' ')
    j +=1
  i += 1
  print('')
copy

How does the code work?

Task

Increment every element in the matrix by 1.

  1. Configure the outer while loop to iterate through each row in the matrix.
  2. Configure the inner while loop to iterate through each element in the row of the matrix.
  3. Add 1 to every element.
  4. Display each updated element.

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 3
toggle bottom row

bookNested while Loop

To summarize, the while loop statement executes a code block repeatedly as long as a specific condition remains True. We opt for a while loop when the number of iterations isn't predetermined.

Now, let's delve into employing a while loop within another while loop.

Examine the code below:


              
1234567891011

            
# Printing numbers from 0 to 4 for 5 times
i = 0
# Setting outer while loop
while i < 5:
  j = 0
  # Setting inner while loop
  while j < 5:
    print(j, end='')
    j += 1
  i += 1
  print('')
copy

How does the code work?

In the previous section, we worked with a matrix. We can achieve the same using a nested while loop!

Examine the code below:


              
1234567891011121314

            
matrix = [ [1, 2, 4, 29],
           [3, 4, 6, 1] ]

# Printing all elements of the matrix
i = 0
# Setting outer while loop to work with the number of rows
while i < len(matrix):
  j = 0
  # Setting inner while loop to work with the number of elements in the row
  while j < len(matrix[i]):
    print(matrix[i][j], end = ' ')
    j +=1
  i += 1
  print('')
copy

How does the code work?

Task

Increment every element in the matrix by 1.

  1. Configure the outer while loop to iterate through each row in the matrix.
  2. Configure the inner while loop to iterate through each element in the row of the matrix.
  3. Add 1 to every element.
  4. Display each updated element.

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!

To summarize, the while loop statement executes a code block repeatedly as long as a specific condition remains True. We opt for a while loop when the number of iterations isn't predetermined.

Now, let's delve into employing a while loop within another while loop.

Examine the code below:


              
1234567891011

            
# Printing numbers from 0 to 4 for 5 times
i = 0
# Setting outer while loop
while i < 5:
  j = 0
  # Setting inner while loop
  while j < 5:
    print(j, end='')
    j += 1
  i += 1
  print('')
copy

How does the code work?

In the previous section, we worked with a matrix. We can achieve the same using a nested while loop!

Examine the code below:


              
1234567891011121314

            
matrix = [ [1, 2, 4, 29],
           [3, 4, 6, 1] ]

# Printing all elements of the matrix
i = 0
# Setting outer while loop to work with the number of rows
while i < len(matrix):
  j = 0
  # Setting inner while loop to work with the number of elements in the row
  while j < len(matrix[i]):
    print(matrix[i][j], end = ' ')
    j +=1
  i += 1
  print('')
copy

How does the code work?

Task

Increment every element in the matrix by 1.

  1. Configure the outer while loop to iterate through each row in the matrix.
  2. Configure the inner while loop to iterate through each element in the row of the matrix.
  3. Add 1 to every element.
  4. Display each updated element.

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