Python - the basics

Original source code and web page address

Python basis

Comment Syntax

" " #No comment syntax is python, written on the front of the language you want to comment. as follows:

# 我就是一行注释语言，你看也白看～

• " " #Any number of data output will not be back at the stage of code to run.

Define the variable

Definition of variables and variable assignments

name='python'
# name就是变量，一个“=”号进行赋值。值为字符串“python”

In the code of the world, the assignment symbol = (equal sign) is not equal to the left of the right meaning. Action only for assignment: to put the right content to the left box.

Representative of the left and right sides of the equal sign is the comparison operator == (double equal sign)

Modify variable values

The final value of the variable is equal to the last value assigned.

name='python'
name='小石头学python'
print(name)
# 最终输出结果：小石头学python

Variable naming convention

• Only one word
• Names can only contain numbers, letters, underscores
• You can not begin with a number
• Semantic far as possible, their meanings description comprising
• Do not use python function names and keywords

Malformed

A, syntax error: syntaxError: invalid syntax

This is usually because the python with the Chinese symbol caused.

In Python, by default all the correct grammar, punctuation are included [English].
Chinese careless use of punctuation, then the computer will not recognize, then an error syntaxError: invalid syntax (syntax error: invalid syntax).