Python

#用python打印出直角三角形:1 #!/usr/bin/env Python 2 # coding=utf-8 3 i = 0 4 while I #对上面的程进行深化, you can get two relative triangles:#!/usr/bin/env python  2 # coding=utf-8  3 i = 0   4 while i  0: 13     j =  0 14     while j The output results are as

Help on the class file in module __builtin__:class file (object)| File (name[, mode[, buffering]), file object||  Open a file. The mode can is ' R ', ' W ' or ' A ' for reading (default),|  Writing or appending. The file would be created if it doesn

Help on the class complex in module __builtin__:Class Complex (object)| Complex (real[, imag]), complex number|| Create a complex number from a real part and an optional imaginary part.| This was equivalent to (real + imag*1j) where imag defaults to

Built-in modules (can be used directly without import) common built-in functions Help (obj), obj is any type callable (obj) to see if an obj can call repr (obj) like a function to get the representation string of obj, which can be used to

Many programs have logging requirements, and the log contains information that has normal program access logs, there may be errors, warnings and other information output, Python's logging module provides a standard log interface, you can store

"""@author:P Eng (non-original)Reference: http://python.jobbole.com/81519/Record: Development history"""Recently writing an Android APP, you need to download the data on the server. Some PDFs, if transmitted directly, will increase the amount of

Two days on business, take advantage of the passion to play Python againThe IDE will choose between Vs and Pycharm, and these two ides likeFirst, VSThe best way to develop python in VS is to get used to it. You can install PTVs, directly create a

Help on built-in function No in module __builtin__:Any (...)Any (iterable), BOOLReturn true if bool (x) is true to any x in the iterable.Any (iterable)Return true if any element of the iterable is true. If the iterable is empty, return False.

There are a lot of things that we have to do in our lives, or actions, that we call loops. There will also be loops in the development process, that is, the need to execute a code repeatedly, or to perform some kind of calculation over and over

Preface Recently, due to project needs, you need to read a TXT document containing Chinese, and then save the file. The document was previously encoded by Base64, resulting in garbled reading of all Chinese characters. After the project team

Preface As you know, Python is a strongly typed, dynamic type-checking language. The so-called dynamic type is that when defining a variable, we do not need to specify the type of the variable, and the Python interpreter automatically checks at

The following small series to bring you a perfect solution to the Python traversal delete the value of the dictionary null element error problem. Small series feel very good, now share to everyone, also for everyone to make a reference. Let's take a

to add a key-value pair First define an empty dictionary >>> dic={} Assign a value directly to a key that does not exist in the dictionary to add >>> dic[' name ']= ' Zhangsan ' >>> dic{' name ': ' Zhangsan '} If key or value are variables, you

Found that too many people will not use the waiting, bloggers today really can't help but to tell everyone about the need to wait. A lot of people in the group asked, this drop-down box is not located, the pop-up box cannot be located ... Various

background Recently the company is doing a message push, then naturally will produce a lot of interfaces, testing process need to call interface, I suddenly feel can I write a test framework? Say dry, because the existing interface test tools

One day in the group of classmates asked, in Python I use input or raw_input all have to input after enter to get to enter the value, that how to implement any key exit pause and other functions, I did not think, because the contact Python time is

Requirements: 1, Level three menu 2, you can choose to enter the sub-menu, select the serial number into the directory 3, enter B to return to the parent directory, q exit change directory Code implementation: #！ /bin/env python#!--*--coding:utf-8

In Python 3.3, generator added a syntax yield from, what is the yield from? What is the grammar? The following through this article mainly give you a detailed introduction of the Python 3 yield from the syntax of the relevant data, the need for

Day 03, day Key knowledge point: Function Definition, recursive function call, flag usage, eval () function #! C: \ Program Files \ Python35 \ bin #-*-conding: UTF-8-*-# author: Frankdef search_backend (): search_list = [] # defines an empty list,

Solution to lxml installation error in Python pip: piplxml Solution to lxml installation error in Python pip 1. An error occurred while installing lxml using pip: >>> Pip install lxml C:\Users\Chen>pip install lxml Collecting lxml Using cached lxml-