The 16th lesson in Python Learning--indentation (indentation)

The most distinctive feature of Python is the code that is labeled as a block in indentation.

below we use the IF selection structure example, if followed by the condition, if the condition is true, then execute a block of code that belongs to the if

look first . C the way of language expression

if (i>0) {    x=1;    Y=3;}

if i>0 , we will carry out the two assignment statements that are included in parentheses. The parentheses contain the block operation, which is subordinate to the if

same purpose, in python , this passage is like this.

if i>0:    x=1    y=3

in python , remove the parentheses around the i>0 , remove the semicolon at the end of each statement, and the curly brace of the block disappears. Extra :( colon ), as well as the indentation of the preceding four spaces in the x=1 and y=3 statements, by indenting python recognizes these two statements when they are subordinate to the if. The reason Python is designed to look good and simple for the program

Summarize:

the indentation of the preceding four spaces in the statement indicates an affiliation, andPython cannot be indented

if < conditions 1>:    statementelif < conditions 2>:    statementelif < conditions 3>:    statementElse:    statement

 while i>0:    x=2    y=3 while     x==2:        Print( " Hello ")

The 16th lesson in Python Learning--indentation (indentation)