Python

Two versions of python2.7 and python3.5 installedpython2.7 first install the download ReadLine:Py-2-m pip install Pyreadline650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M01/89/18/wKiom1gHNcWAuAjFAADb1cogOfY708.png-wh_500x0-wm_3 -wmp_4-s_163

What is an operator>> in Python, we have symbols that manipulate one or more numbers or stringsWhat are the operators>> Our common operators in Python are: + 、-、 *,/, * *, ,! =,//,%, &, |, ^, ~, >>, =, = =, not, and, orHow to use Operators>>> # ' + '

1>>> name ="I Love my job!"2>>> name.capitalize ()#Capitalize first letter3 'I Love my job!'4>>> Name.count ("o")#count the number of letters526>>> Name.center (50,"-")#output 50 characters, not enough to "-" completion, and name in the middle; Name.

# -*- coding: utf-8 -*-#!/usr/bin/env pythonimport pexpect,os      #导入需要用到模块def  ssh_cmd (ip, shell_cmd):p asswd=  ' 1qaz#edc ' print  ' Host: %s is  connected...  '  % ipchild = pexpect.spawn (' ssh [email protected]%s ')  %  (IP)) fout = file ('

str= ' python String function ' Generate string variable str= ' python string function ' String length acquisition: Len (str) Example: print '%s length=%d '% (Str,len (str)) 1. Letter Handling All caps: Str.upper () All lowercase: str.lower () Case

function in the definition, by the parameter before the asterisking number, passing in a number of arguments into an object, a tuple or a dictionary, it can be said that these parameter values are collected. Parameter with an asterisk indicates

Introduction: Daniel often says reading the source code is a very inefficient way to learn. But for my generation, reading source code is a good way to master programming ideas and coding norms. In short, read the source code is not omnipotent, do

Preparatory work To ensure that the class is a new class, you should put the _metaclass_=type into the beginning of your module. Class NewType (Object): Mor_code_hereclass oldtype:mor_code_here In this two class Newtype is the new class, Oldtype

Python's namespace is something the Python program ape must understand, and learning about the Python namespace will allow us to essentially master some of the trivial rules in Python. Next I will reveal the nature of the Python namespace in four

One, package name, module name, local variable name, function name All-lowercase + underline hump Example:this_is_var Second, global variables All caps + Underline hump Example:global_var Third, class name First-Letter Capital

Python type conversion Function description int (x [, Base]) converts x to an integer Long (x [, Base]) converts x to a long integer Float (x) converts x to a floating-point number Complex (real [, Imag]) creates a complex number STR (x) converts

When I recently backed up the photos on my phone, I felt a bit of a hassle with purely manual operation and wanted to write a script to do it automatically. Some photos have been backed up before, so there is a need for a weight-back operation. The

Python global variables and local variables #Python中的变量: Global variables and local variables #在很多语言中, when declaring global variables, like to define the name of the global variable as uppercase #定义学生人数为100STUDENT_NUMBER = 100# School name

Complete data science learning path (Python version), path python Reprinted from: http://python.jobbole.com/80981/ Connection:

Python django multi-level business tree structure Planning and page rendering, pythondjangoOverview: In the project, the Parent-Child structure is not uncommon. If there are only two tree structures, we can use the foreign key design of the database

Python built-in functions (7) -- bytearray, pythonbytearray English document: Classbytearray([Source[,Encoding[,Errors]) Return a new array of bytes.bytearrayClass is a mutable sequence of integers in the range 0 bytesType has, see Bytes and

Python built-in functions (8) -- bytes, pythonbytes English document: Classbytes([Source[,Encoding[,Errors]) Return a new "bytes" object, which is an immutable sequence of integers in the range0 .bytesIs an immutable versionbytearray-It has the same

Python screen code and function details, python function details Let's talk about the code for implementing the python screen first. The specific code is as follows: from selenium import webdriverimport timedef capture(url,

Use the Python script to detect problems and solutions for batch website survival. During the penetration test, there was a large project with hundreds of websites. In this way, you must first determine which websites are normal and which websites

Django model removes the unique_together error solution, djangomodelunique This is the case. I have a table that stores the exam. class Exam(models.Model): category = cached_fields.ForeignKeyField(Category) name = models.CharField(max_length=128)