Writing high-quality code to improve Python programs 91 recommendations for Learning 01

Writing high-quality code to improve python programs take the advice of learning

Chapter I.

Recommendation 1: Understanding The relevant concepts of Pythonic

Narrow understanding: It is a high-level dynamic scripting language with many powerful libraries that are interpreted from the top down

Characteristics:

Beauty wins the ugly, obviously wins the hidden, Jiansheng Miscellaneous, miscellaneous wins the chaos, the flat wins the steep, the sparse wins the secret

Python definition

#python Sort

def quicksort (arr):

Less=[];greater=[]

If Len (arr) <=1:

Return arr

Pivot=arr.pop ()

For x in arr:

If X<=pivot:

Less.append (x)

Else

Greater.append (x)

return quicksort (less) +[pivot]+quicksort (greater)

ARR=[9,8,4,5,32,64,2,1,0,10,19,27]

Print (Quicksort (arr))

# Results : [0, 1, 2, 4, 5, 8, 9, ten, , +, +]

Code style

How to switch between multiple variables, basic syntax

A,b=b,a

Principle

For conversions between multiple variables

Using an XOR method to implement conversions between multiple variables, as follows

a ^=b;

B^=a;

A^=b;

Please look at the explanations in this : http://blog.csdn.net/magictong/article/details/3321232

Http://www.cnblogs.com/haoshine/p/5117433.html

http://lionelliu.com/?p=970

An interpretation of a different or

& two digits in bitwise and binary, and the binary is 1 , the result is 1, otherwise 0.

| two digits in a bitwise OR binary, binary has 1 , the result is 1 , otherwise the 0.

^ two digits in bitwise XOR or binary, the result is 1 when the binary wants to be different .

~ Flip x rollover is -(x+1), that is,positive negative number, negative number becomes positive

# Traversal

def fo_r (d):

# The first kind of traversal

For I in range (len (d)):

Return # Statement body

# The second kind of traversal

For I in D:

Return

Close File

with it is a style that contains iterators

with open () as F:

Pass

Slice

s=[1,2,3,4]

S[::-1]

Recommended Use

List (reversed (s))

Connection string :%s,+

Recommended . Format (*args,**kw)

Use a python framework or library to boost your productivity

Frames such as :d jango,tornado,flask , etc.

Library : Time,requests

If you need to go to pipy official download,

Pipy address is as follows : Https://pypi.python.org/pypi

Writing pythonic code

Rules

1: to avoid the deterioration of the code

(1): Avoid using case only to distinguish different objects

(2): Avoid the use of confusing names, including the reuse of variable names that already exist in the context to represent different classes

Model, misuse of built-in methods or functions

(3) don't be afraid to use too long variable names

Writing high-quality code to improve Python programs 91 recommendations for Learning 01