Detailed Python development rules

1.Python Advantages: Simple, elegant, clear python drawbacks

2. Powerful modular three-bedroom library 1. Code cannot be encrypted

3. Easy to transplant 2. Slow speed

4. Object-oriented

5. Extensible (c\java\c# .... ）

CPython

Ipython

Jython

PyPy

Lronpython

Programming style

Indentation Unification

Variable

1. The first character of the identifier must be the letter in the alphabet (uppercase or lowercase) or a lower loop ('_').

2. Other parts of the identifier name can consist of a letter (uppercase or lowercase), an underscore ('_'), or a number (0-9).

3. The identifier name is case-sensitive. For example, MyName and myname are not an identifier.

4. Examples of valid identifier names are I, _my_name, name_23, and A1B2_C3.

5. Examples of invalid identifier names are 2things, this was spaced out and my-name.

Python data types (by feature)

Numeric type integer: Boolean, Long Integer, standard integer non-integral: double-precision floating point, plural, decimal (not built-in type)

Sequence type: string, tuple, list

Image type: Dictionary

Collection type: Mutable collection, immutable collection

Python data type (by variability)

Hash, immutable data type: Numeric type, immutable collection, string, tuple

mutable data types: Dictionaries, lists, mutable collections

Convert utf-8 name.encode (' Utf-8 ') Cancel Name.decode (' Utf-8 ')

Program if you want to save Chinese

#_ *_ Coding:utf-8 _*

Name=u "Chinese"

Print Name

To interact with the system to save files

Import OS

A=os.popen (' pwd '). Read ()

A

Import commands

Res =commands.getstatusoutput ("pwd")

Res

Import Sys

Import System as Alias

Not recommended: Form SYS import *

Print SYS.ARGV

Print aliases

Print path

User interaction

Raw_input

%s string

%d numbers

1

# (Single comment) Note each line cannot exceed 80 characters

"" (multiline comment) can comment the whole paragraph

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

Rules that force indentation of code (official proposal to indent 4 spaces)

2

The modules that you write yourself must be in the current directory to be imported or a python-specified directory:

Importsys

Print (Sys.path)

/usr/bin/python2.7/dist-packages Directory (Global)

Assign value

Counter + = 1 #counter = counter + 1

user = = Username

passwd = = Password

User,password = ' liangml ', ' LIANGML '

Del Delete the in-memory data

Del Name[2:3]

You should be constant when you see someone else's code in uppercase, don't change it easily.

3

3.0:input Module

2.7 or less: raw_input