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Python built-in type (2) -- Boolean operation, python Boolean In python, the bool operators are sorted by priority.or,and,not, Whereor,andShort-circuit Operator notTest the true value of the expression before obtaining the inverse value. notThe operator has only one expression,notTest the true value of the expression a

The path to Python development article 2 (1) _ data type built-in function usage, the path to python GrowthData Type built-in function usage int There are many built-in methods. Here is a summary. (1) _ abs _ (...) returns the absolute value of x.# Returns the absolute value of x !!! All are double underscoresX. _ abs _ () For example:#! /Usr/bin/pythonPrint "abs

) Change the value within a range list[n:m] = t. T represents a value that can be iterated, and the number must be consistent with the scope of the substitution(3) Delete element Del. Another way to delete a range x[0:2] = [] equals an empty sequence is also a delete(4) List.remove (x) deletes a value. If the same value is the same, the first matching value is deleted(5) List.clear () empty list(6) Append element list.append (x) and extension element

See this topic you may guess what I want to say next, oh, yes, that is the list of these two different versions of the But not! You'll find that Python has two major versions, Python2 and Python3, but Python is different from other languages, backward-compatible, and Python3 is backward-compatible, but most of the components and extensions are based on Python2, Here's a summary of the difference between Py

,open(‘log2‘) as obj2:pass Program Exercises Program 1: Implement a simple shell sed replacement function Program 2: Modify the Haproxy configuration file Demand: Demand Original configuration file 6. Character encoding and transcoding Detailed article: Http://www.cnblogs.com/yuanchenqi/articles/5956943.html Http://www.diveintopyth

Python Regular Expression 2, python Regular Expression Matching phone number: 1 >>> import re 2 >>> pattern=r'\d{3,4}-?\d{8}' 3 >>> re.findall( pattern, '021-12345678' ) 4 ['021-12345678'] 5 >>> re.findall( pattern, '02188888888' ) 6 ['02188888888'] 7 >>> re.findall( patter

Self-taught Python 9 crawler practice 2 (meitu welfare), python Crawler As a young man with ideas, culture, and morality in the new century, in this society, I am so distressed that I am playing slowly to resist Baidu, it's okay to go online and visit YY. It's essential to look at the beautiful pictures. However, although the beautiful pictures are difficult to f

Recently in learning Python, like many beginners, the beginning of a more tangled in the end is version 2 or version 3 is the future trend. In order to avoid too many detours, special online Check the relevant information, summed up some 2 and 3 differences, a lot of content is reproduced, the great God do not despise ha ... 1. Performance The Py3.0 runs Pystone

Recently in learning Python, like many beginners, the beginning of a more tangled in the end is version 2 or version 3 is the future trend. In order to avoid too many detours, special online Check the relevant information, summed up some 2 and 3 differences, a lot of content is reproduced, the great God do not despise ha ... 1. Performance The Py3.0 runs Pystone

Python learning notes (4) Numbers (2) and python learning notes Python Division in Python2 1 >>> 3 / 6 2 0 3 >>> 3.0 / 6 4 0.5 5 >>> 3.0 / 6.0 6 0.5 7 >>> 5 / 2 8

(1, num_num + 1)Print "BEFORE:", fac_list I = 0 While I If num_num % fac_list [I] = 0: # Check whether the input number can be divisible by an element in the list.Del fac_list [I]I = I + 1 Print "AFTER:", fac_list[Execution result]Enter a number: 12BEFORE: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]AFTER: [2, 4, 5, 7, 8,

While loop　　1. Basic cycle 123456 while条件:# 循环体# 如果条件为真，那么循环体则执行# 如果条件为假，那么循环体不执行 2. BreakBreak to exit all loops 1234 whileTrue:print "123"breakprint"456" 3, continueContinue is used to exit the current loop and continue the next loop 1234 whileTrue:print "123"continueprint"456" Exercises1. Use while loop input 1 2