Detailed explanation of python development rules

1.python advantages: simple, elegant, clear python disadvantage

2. Powerful module Three reservoirs 1. Code cannot be encrypted

## 3.

#4. Object-oriented

5. Extensible (c\java\c#....)

cpython

ipython

jython

pypy

lronpython

Programming style

Uniform indentation

Variables

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

          2. The other parts of the identifier name can be composed of letters (uppercase or lowercase), underscores (‘_’) or numbers (0-9).

3. Identifier names are case-sensitive. For example, myname and myName are not the same 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 is spaced out and my-name.

Python data types (divided by characteristics)

Numeric type Integer type: boolean, long integer, standard integer type Non-integer type: double precision floating point type, complex number, decimal (not Built -in type)

## Series Sequence type: string, Yuan group, list

image type: dictionary

collection type: variable collection, non -variable collection

python data type (divided by variability)

可: Number type, non -variable collection, string, Yuan group

## Variable data type: Dictionary, list, variable collection

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

If you want to save Chinese

#_*_ coding:utf-8 _*

name=u"中文"

print name

Interact with the system to save files

                                                                                                                                                                                                                                                                                         " getstatusoutput(''pwd)

res

import sys

import system as alias

Not recommended: form sys import *

print sys.argv

print alias

print path

User interaction

raw_input

%s string

%d number

1

# (single-line comment) each line of comment cannot exceed 80 characters

''' '''(multi-line comment) OK Comment the entire paragraph

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

Rules for forcing indentation of code Zhijian (the official recommendation is to indent 4 spaces)

2

The module you write must be importable in the current directory or the directory specified by python:

importsys

print(sys.path)

/usr/bin/python2.7/dist-packages directory (global)

Assignment

counter += 1 #counter = counter + 1

user == username

passwd == password

user,password = 'liangml','liangml'

del Delete data in memory

del name[2 :3]

When you see other people’s code in uppercase, it should be a constant, don’t change it easily

3

3.0: input module

2.7 or below :raw_input

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