Contenu du cours

Python Loops

1. While Loops: Get Started

Simple While Loop Challenge 1 Challenge 2

2. While Loops: Essentials

Infinite Loops Challenge Break Continue Else Challenge

3. For Loops

Simple For Loops range()enumerate()zip()

4. Nested Loops

Nested Loops Break and Continue with Nested Loops Challenge

range()

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)

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)

Tâche

Swipe to start coding

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.

Solution

Passez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessous

Tout était clair ?

Merci pour vos commentaires !

Section 3. Chapitre 2

range()

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)

Negative step


              12
            
for i in range(20, 8, -2):
  print(i)

Tâche

Swipe to start coding

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.

Solution

Passez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessous

Tout était clair ?

Merci pour vos commentaires !

Section 3. Chapitre 2

Passez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessous