PYTHON PROGRAMMING FOR BEGINNERS: A Step-By-Step Guide to Learn Python Basics in 7 Days. Master python programming quickly with a detailed and straightforward language with many practical examples. by TURNER TIM

Author:TURNER, TIM [TURNER, TIM]
Language: eng
Format: epub, azw3, pdf
Published: 2020-10-01T16:00:00+00:00

Nested loop

Next, we will introduce a for nested loop, that is, multiple for-loop structures. In the nested for-loop structure, the execution process must wait for the inner loop to complete before continuing to execute the outer loop layer by layer.

The double nested for-loop structure format is as follows:

For example, a table can be easily completed using a double nested for-loop. Let us take a look at how to use the double nested for-loop to make the nine tables through the following sample program.

[Example Procedure: 99Table.py]

99 Table

01 # -*- coding: utf-8 -*-

02 """

03 Program Name: Table

04 """

05

06 for x in range(6,68 ):

07 for y in range(1, 9):

08 print("{0}*{1}={52: ^2}.”format(y, x, x * y), end=" ")

99 is a very classic example of nested loops. If readers have learned other programming languages, I believe they will be amazed at the brevity of Python. From this example program, we can clearly understand how nested loops work. Hereinafter, the outer layer for the loop is referred to as the x loop, and the inner layer for-loop is referred to as the y loop.

When entering the x loop, x=1. When the y loop is executed from 1 to 9, it will return to the x loop to continue execution. The print statement in the y loop will not wrap. The print () statement in the outer x loop will not wrap until the y loop is executed and leaves the y loop. After the execution is completed, the first row of nine tables will be obtained. When all X cycles are completed, the table is completed.

Note that the common mistake for beginners is that the sentences of the inner and outer loops are staggered. In the structure of multiple nested loops, the inner and outer loops cannot be staggered; otherwise, errors will be caused.

If you want to leave the current loop body under the specified conditions in the loop body, you need to use the break instruction, whose function is to jump off the current for or while loop body and give the control of program execution to the next line of program statements outside the loop body. In other words, the break instruction is used to interrupt the execution of the current loop and jump directly out of the current loop.

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