Python Learning Notes _ character encoding

1. Character encoding

ASCII code: One byte=8 bit, 128 characters in English letter case, Roman character, etc.

GB2312, GBK, GB18030 (China's own) Express Chinese characters, get up early general mobile device support to GB2312

Unicode: Universal code, 2 byte=16 bits representing all characters

UTF-8: A dynamically varying length encoding. Save in English 1byte, Chinese 3byte. Python3 character Set bit UTF-8. Python2 default encoding is ASCII code, if you want to support Chinese characters in Python2, add #-*-coding:utf-8-*-at the top of the code

2. Symbol syntax

A single line in front of the line with #, paragraph comments in a row before the paragraph and after the paragraph with ""

"Can also be used to refer to a paragraph string

Single and double quotes are exactly the same in Python, and special symbols in the referenced content are not escaped. (single quotes are escaped in Bashell)

Referencing a variable in a string, Method 1 uses the + connection

Method 2: Use the placeholder%s to write% after the string (variable name 1, variable name 2) # # #s表示string, D for digital numbers, F for floating-point number floating, percent sign to be the same as variable type, python default Volume types are str, print variable type: print (type (variable name))

Method 3: Use {} After the string to add. Format () For example

Method 4:

Convert variable type int () str ()

Input (' string ') # # #在python27里位raw_input ()

3.getpass Module

Import Getpass

passwd = Getpass.getpass ()

Python Learning Notes _ character encoding