Python

Develop a simple Python calculator1, realize subtraction and extension number priority analysis2, the user input 1-2 * ((60-30 + ( -40/5) * (9-2*5/3 + 7/3*99/4*2998 +10 * 568/14))-( -4*3)/(16-3*2)) and other similar formulas, you must parse the

Python version 3.6mkdir makedirs DifferenceMkdir1. Recursive creation is not supported;2. Support relative path and absolute path;3. Creating directories and working directories is irrelevant.Makedirs1. Support recursive creation;2. Support relative

1. Double Underline (__)Properties that start with a double underscore are confused at execution time, so direct access is not agreed. Properties that actually start with a double underscoreThe underscore and the class name are prepended to the

This article mainly describes the Python program ape code should be avoided when writing 17 "pit", but also can be described as Python program Ape code should be avoided when writing 17 questions, the need for friends to participate in the testDo

Installation methods are similar in each environment, I use the Windows system, after installing Python, the Python installation directory and the installation directory under the scripts directory to join the environment variable PATH variable, if

1 first need to install Cython. Download online after downloading the python setup.py install2 Download Sklearn package, https://pypi.python.org/pypi/scikit-learn/0.14.1. Local installation (using PIP or Easy_install is always an error.) such as can

First, the Linux version:Linux files are stored in: ~/.pip/pip.confSecond, Windows version:Create the PIP directory under the User folder and create the Pip.ini file (%home%\pip\pip.ini) in the PIP directory[global]trusted-host=pypi.doubanio.com

Many people do not understand the role of self, feel redundant, in fact, self is very useful.Give an example first:1 class A_class: 2 def func (self):3 print (self)4 print (self.__class__) 56 >>> a= a_class ()7 >>> a.func 8Object0

Environment Introduction:Win7 64-bit SP1python:2.7.6Gateway Interface: FlupNginx Installation: http://blog.csdn.net/jacson_bai/article/details/46388775Djang Installation: http://blog.csdn.net/jacson_bai/article/details/418239451.flup

I. Definite time tupleSecond, the test code1493368879.41, timestamp print time.time () # Gets a tuple, time.struct_time (tm_year=2017, tm_mon=4, tm_mday=28,# tm_hour=16, tm_ min=41, tm_sec=19, tm_wday=4, tm_yday=118, tm_isdst=0) print time.localtime

1. Time.time () was given a timestamp, how many seconds since 19702, Time.strftime (), set the time in fixed formatResults3. Logical relationshipExample:Import timeimport datetimeimport calendarimport timeimport calendark=0def nowtime (): t1=time.

#Coding:utf-8ImportRequestsImportJsonurl='http://www.toutiao.com/search_content/?offset=0&format=json&keyword=%E5%B0%8F%E5%BA%B7%E7%A4%BE%E4 %bc%9a&autoload=true&count=20&cur_tab=1'Wbdata=requests.get (URL). TextData=json.loads (wbdata) News=

title: Fibonacci sequence.Program Analysis: This sequence starts with the 3rd item, each of which equals the sum of the first two. SoN=1,2,f=1N>2,f=f (n-1) +f (n-2)For example: 1,1,2,3,5,8 .....>>> def f6 (n): If N==1 or N==2:return 1elif n>2:return

We will see some instances of using threads in Python and how to avoid the competition between threads. You should run the example below several times so that you can notice that the thread is unpredictable and that the threads run out of different

Day4 decorations and day4 decorations Python decorator 1. Required Def foo (): Print (foo) >>> Foo Foo is a function, function body; Foo () is the execution of the foo function. Def foo (): Print (foo) Foo = lambda x: x + 1 Foo () will execute the

Python crawler path of a salted fish (1): requests library, pythonrequests After playing the game for three years as a salted fish University, I suddenly realized that now I want to learn something. Here I will record what I learned. The urllib

Python fundemental, fundemental 1. function parameters and local variables The Parameter Variable allocates memory units only when called. The allocated memory units are immediately released at the end of the call. Therefore, the parameter is valid

Python learning-regular expressions, python Regular Expressions A regular expression is a special character sequence that helps you easily check whether a string matches a certain pattern. The re module enables the Python language to have all the

Examples of three traversal methods of Python List (List), pythonlist Python Traversal I recently learned the python language and felt that it has greatly improved my work efficiency. I don't want to talk about it here. I just paste the Code

Python learning notes-json Parsing Method Analysis, pythonjson This example describes how to parse json in Python. We will share this with you for your reference. The details are as follows: I just learned how to parse json in Python and thought it