Python

1,ssh Login Virtual machine (remote server) 2, build the configuration file Jupyter Notebook--generate-config 3. Generate password This step is not actually used, because the password is not recommended to log in, modify the configuration file when

1, control structure 1.1 piece branch 1.2 circulation 1.2.1 while loop 1.2.2 for loop 2, exception handling 2.1 Catch Exception 2.2 Produce exception 2.3 Custom exception 3, custom function 3.1 name and Docstrings 3.2 parameter and parameter split 3.

Network relatedUniversal Urllib-Network library (standard library) requests-Network library grab-network library (PYCURL) Pycurl-Network library (with Libcurl binding) URLLIB3-with thread-safe connection pool, file Psot support, high-availability

This article mainly refers to: http://www.cnblogs.com/mouse-coder/archive/2013/03/03/2941265.html Author: The mouse who knocks the code Original SHA1 encryption method can refer to my previous blog: http://blog.csdn.net/monsion/article/details/798136

Chapter II NumPy Foundation 2.6 Changing the dimension of an array Ravel (), flatten () flatten multidimensional arraysB.transpose () matrix transpose, equivalent to B. T, one-dimensional arrays are invariant reshape () changing the array dimension

Who to complain the about this terrible package???? Its official website is down, it bugs and exceptions are famous, and its Python wrapper code has errors ... But everyone use it for summarization tasks. Not cool on all. Can not help but spit,

Anaconda, in short, is a packaged Python collection with package management and environmental management tools and Python packages for data science computing. Download and install https://www.anaconda.com/download/#macos from here. After the

Today, let's talk about how to gracefully switch between multiple versions of Python on a Windows system.Although Python3 has been out for a long time, although Python2 is about to become a history, but for historical reasons , there are still many

ParisgabrielStick to Handwriting day by day a decision hold on for a few years to dream for faith　　　　　　　　　　　　　　　　　　　　　　Python ai from beginner to proficientAdd: The relative import of a package is only useful for the latter two import

Add a lock--fcntl module to a file in PythonImport FcntlOpen a file# #当前目录下test文件要先存在, if not present will error. or open it in a written way.f = open ('./test ')Encrypt the file:Fcntl.flock (F,fcntl. LOCK_EX)This locks the file test, and if there

Life is endless struggle!The purpose of subprocess is to start a new process and communicate with it.Only one class is defined in the Subprocess module: Popen. You can use Popen to create processes and make complex interactions with processes. Its

Import requestsImport reheaders = {' User-agent ': ' mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; trident/5.0) '}Info_lists = []def judgment_sex (class_name):if class_name = = ' Womenicon ':Return ' woman 'ElseReturn ' Male 'def

The variable names in Python are parsed at compile time, in other words, at compile time (that is, when the interactive console enters the code or import file), Python has decided whether a variable should be a local variable or a global variable.

The Dict (or object) of Python and the conversion of JSON to each otherIn the Python language, the conversion between JSON data and dict dictionaries and objects is an essential operation.Bring your own JSON library in Python. by import json

1. Explain what is the stack overflow and under what circumstances it may occur. Stack overflow is due to the fact that the C language family does not have a built-in check mechanism to ensure that data copied to the buffer is not larger

1 file reading and writing supplementFile modificationMethod 1: Simple Rude Direct:1. Get all the contents of the file first2. Then modify the contents of the file3. Empty the contents of the original file4. Re-writef = open (' test1.txt ',' r+

First, Brief introduction matplotlib1. Matplotlib is a powerful toolkit for Python drawing and data visualization2. Installation method: Pip Install Matplotlib3. Citation method: Import Matplotlib.pyplot as Plt4. Drawing function: Plt.plot ()5.

Since it is a Python programmer xxx, it is necessary to use Python Programmer's method.Today our goal is to crawl the community of beauty ~ and, we have to use a new posture (fog) ~scrapy crawler Frame ~1scrapy principleAfter writing a few bots, we

Let's look at an example:Test1 = [' A ', ' B ', ' C ', ', '] for in test1: if': test1.remove (i) #删除空元素 Print (test1)>>>[' A ', ' B ', ' C ', ']At this point, we found that we did not achieve the results we want, the reasons are as follows:

RecursiveContinue running functions within the function, knowing that a goal is reached and the final return value.Characteristics of recursion:1. The function must have a definite end condition2. Without entering a recursion, the problem that needs