This article mainly introduces four knowledge points, which is also the content of my lecture.
1.PCA Dimension reduction operation;
PCA expansion pack of Sklearn in 2.Python;
3.Matplotlib subplot function to draw a child graph;
4. Through the Kmeans to the diabetes dataset clustering, and draw a child map.
Previous recommendation:The Python data Mining course. I
Guangzhou Python training course which is good? Python is not only a computer programming language, but also a concise, powerful, object-oriented programming language, has become more and more popular in recent years. Guangzhou Python training course which is good? How do I
listLet's look at the following code:1names = ['Peter','Mina','Mpeter','Katherine']2My_friends =names[:]3 4 Print('I have a list of my friends:')5 Print(names)6 Print("however Mina have a same list!")7 Print(my_friends)8 Print("But Mike just has both in my list")9Mike_friends = Names[0:2]Ten Print(mike_friends)The principle of copying a list is actually simple: Declares a list, and assigns a value, and then declares a list B, and then iterates through list A and passes the value to the end of
Course Notes and Python tutorials
Concise Python tutorial is a good entry-level Python tutorial on the Internet. Although the version is old, the basic explanation is very powerful.
Ch2-install Python: After downloading and installing Py
matrix when you calculate Np.dot (A, A.T). The shape of A is (5, 1), and a. The shape of T is (1, 5).A.shape = (5,) This is an array of rank 1, not a row vector or a column vector. Many students appear to be difficult to debug bugs are from the rank of 1 arrays.In addition, if you do a lot of things in the code, you may not remember or are unsure of how a is, use assert (A.shape = = (5,1)) to check the dimensions of your matrix.If you get (5,) you can reshape it into (5, 1) or (1, 5), reshape i
This article summarizes the first day of the study of the old boy's Python automated operations course.
The general contents are as follows:
Python Introduction
First Python program: Hello World
Python variables
User interaction (user input, Output)
Process Control: Conditi
Assume is s a string of lower case characters.Write A program This prints the longest substring of in s which the letters occur in alphabetical order. For example, if s = ‘azcbobobegghakl‘ , then your program should printLongest substring in alphabetical order Is:begghIn the case of ties, print the first substring. For example, if s = ‘abcbcd‘ , then your program should printLongest substring in alphabetical order IS:ABC# Paste Your code into this boxCount = 1result = S[0]While S:Newcount = 1New
In the support of everyone, basically completed a quick tour of the serial. I learned a lot from this process. After Python's foundation, the Python standard library naturally becomes the next challenge. The importance of the Python standard library is:1 It is part of Python.2 python philosophy is a problem with only
This article mainly introduces the detailed process of Python crawling Coursera course resources. For more information, see some typical things, some Coursera courses are undoubtedly classic. Most of Coursera's finishing courses provide complete teaching resources, including ppt, video, and subtitles. it is very easy to learn offline. Obviously, we won't download a file or a file. it's just a fool. programm
, Xcsrf2cookie, Xcsrf2token)Post_headers = {"User-agent": user_agent,"Referer": "Https://accounts.coursera.org/signin","X-requested-with": "XMLHttpRequest","X-csrf2-cookie": Xcsrf2cookie,"X-csrf2-token": Xcsrf2token,"X-csrftoken": Xcsrftoken,"Cookie": Cookie}
This login function is initially implemented.
Analyze Resource Links
After the login is successful, we just need to get to the content of the resource page and then filter out the resource links that we need. The address of the resource
SummaryIntroductionResearch background and research status of the projectBackground and purpose of the project Research status meaning Main work Project arrangement Development tools and their development environmentDemand Analysis and Design Functional AnalysisCrawler page CrawlCrawler page ProcessingCrawler function implementationCrawler SummaryPython Programming Course report the application of Python te
. Float type, floatPrint (Type (52.3E4)) print (Type (52.3E-4))C. Boolean valueTrue or FalseTrue or False1 or 0Data operations1. Arithmetic operations:+-*/, subtraction% modulus, remainder* * Power, exponentiationThe integer part that returns the quotient.2. Comparison operation:= =, equal to! =, not equal to, in Python 2.x sometimes this means:, 3. Assignment operation=,+=,-=,*=,/=,%=,**=,//=4. Logical operationAnd,or,notWith, or, non-5. Member Opera
many parameters are passed in when defined
Positional parameters/keyword parameters
When calling a function, you can pass in two arguments
One that doesn't have a name.
One is the keyword parameter with key
If mixed, all positional parameters must be before the keyword argument must be in the back
Range function
Range (N)
Sequence from A to n-1
Range (Start,end)
Sequence from start to End-1
Range (Start,end,step)
Step inte
Zero basic learning python _ list and Meta Group (course 10-13), python10-13
Today, I will go back and look at the list and metadata. Let's talk about the list. The list is actually the most frequently used data type in python. It is not only often used but also powerful, this is similar to the array in the C language, and the list can also be added, deleted, mod
enterprise merit, the competitive environment of the fittest, the kind of institutions that do not ask students basic conditions, commitment to package employment needs careful choice.Good training institutions should have many years of employment counseling professional teachers, to help students from career development direction, resume perfect, mock interview and other aspects of counseling, and through pre-interview set up to help students accurate positioning, mining their potential compet
Share--https://pan.baidu.com/s/1c3emfje Password: eew4Alternate address--https://pan.baidu.com/s/1htwp1ak Password: u45nContent IntroductionThis course is intended for students who have never been in touch with Python, starting with the most basic grammar and gradually moving into popular applications. The whole course is divided into two units of foundation and
The python language has been increasingly liked and used by program stakeholders in recent years, as it is not only easy to learn and master, but also has a wealth of third-party libraries and appropriate management tools; from the command line script to the GUI program, from B/S to C, from graphic technology to scientific computing, Software development to automated testing, from cloud computing to virtualization, all these areas have
Is there a future for Python learning?U.S. Python Engineer Salary: 8-11w USDChina, with Beijing as an example, had only 30 python jobs nationwide in 2013,The geographical difference is very large.Programming language rankings:2013, Python row eighth2015 rows to the four.Codeeval website Research, project development pr
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