Python loop types

In this article we introduce Python's loop, the program in general are executed sequentially. Sequentially means in sequential order (top down):

do A
do B
do C

In a variety of programming languages, control structures allows for more complex execution paths.

Loop allows us to perform a statement or group of statements repeatedly, the following is the general form in most programming languages ​​loop statement:

Python is provided for and while loops (not do..while loop in Python):

Circulation type	Description
The while loop	determines the given condition is true. When the execution loop, or exit the loop.
For loop	Repeat statement
[Nested loop]	You can be nested for loop while loop body

The while loop in code:

>>> index = 0
>>> n = 10
>>> while index < n:
...     print(index)
...     index = index + 1
... 
0
1
2
3
4
5
6
7
8
9

The for loop:

>>> for i in range(1,3):
...     print(i)
... 
1
2

The nested for loop:

>>> 
>>> for x in range(1,10):
...     for y in range(1,10):
...         print(f"({x},{y})")

loop control statements

Loop control statements can change the order of statement execution. Python loop control supports the following statement:

Control statements	Description
Break Statement	Terminates the loop during the execution of statement block, and jump out of the entire cycle
Continue Statement	Terminates the current execution loop statement block, out of the cycle, the next cycle execution.
Pass sentence	pass an empty statement, in order to maintain the integrity of the program structure.