defines functions, but also has many built-in useful functions that can be called directly.
Abstraction
Abstract is a very common concept in mathematics. For example:
Calculate the sum of the series, such as: 1 + 2 + 3 +... + 100, it is very inconvenient to write, so mathematicians invented the summation symbol Σ, which can put 1 + 2 + 3 +... + 100 note:
100∑nn=1
This abstract notation is very powerful, because we can see that Σ can be understood a
This article mainly introduces the Python encryption module md5, sha, and crypt instances. This article provides the MD5 and crypt module code examples, for more information, see the MD5 (Message-Digest Algorithm 5) module to calculate information ciphertext (Information Digest) and obtain a 128-bit ciphertext. The sha module is similar to md5, but generates a 160-bit signature. The usage is the same.
The following
This article mainly introduces the usage of the urllib module in python, and analyzes in detail the curl operation method of replacing PHP with the urllib module in python in the form of an instance, which has good reference value, for more information about the urllib module usage in python, see the following example.
Example of how to use Python multi-process concurrency (multiprocessing)
This example describes how to use Python multi-process concurrency (multiprocessing. Share it with you for your reference. The specific analysis is as follows:
Due to restrictions of Python design (I am
The example of this article describes the Python socket programming in more detail. Share to everyone for your reference. Specifically as follows:
Copy code code as follows:
Sock=socket.socket (Socket.af_inet,socket. SOCK_STREAM)
The code above creates a socket object. The type parameter represents a socket type and can be sock_stream (stream sockets) and Sock_dgram (datagram sockets). Af_inet represents
Python OpenCV histogram calculation and display method example, pythonopencv
This article introduces how to use OpenCV Python to calculate histograms, and briefly introduces how to use NumPy and Matplotlib to calculate and draw histograms.
The background knowledge and usage of the histogram are omitted. Here we will introduce the method directly.
Calculate and di
This article mainly introduces the implementation of the python dictionary sorting method. The example analyzes the skills related to the Python dictionary sorting. If you need it, you can refer to the example in this article to analyze the python dictionary sorting method.
The following is an example of how to declare an anonymous function using Python lambda statements: pythonlambda
The so-called anonymous function does not need to define a function. It is used like an expression and does not need a function name (many times it bothers me). Some simple functions are simple. For exampleI need a function that adds two integers, which is usually defined in this way.
def add(x,
Today, we mainly talk about the thinking and habits of developers.
Thinking includes programming thinking and analytical thinking for solving a specific problem, analysis ideas, analysis methods, and even analysis tools.
Both good habits and bad habits are formed by a day's thinking. Those bad habits are hard to be changed after a long time. Therefore, if you recognize it today, you can change it from today, and get the benefit of it early.
Let's talk about today's introduction, that is, using
Example of the usage of dictionary items () series functions in Python, pythondictionary
This article describes the usage of dictionary items () series functions in Python and provides reference for Python program design. The specific analysis is as follows:
Let's look at an exampl
() functionThe reduce () function receives a parameter similar to map (), a function f, a list, but behaves differently from map (), and reduce () the incoming function f must receive two parameters, and reduce () calls function f repeatedly on each element of the list, and returns the final result value. For example, write an F function that receives x and Y, and returns the and of X and Y:
12
deff(x, y):return x+y
W
\d+)/vote/$ ', views.vote,name= ' vote '), #url中, three parameters. Regular URLs, processed functions, and name # REGULAR Expressions!!!!!
Then in the root urls.py file, include this file.
dizzy@dizzy-pc:~/python/mysite$ Vim mysite/urls.py
From Django.conf.urls import patterns, include, url from django.contrib import adminadmin.autodiscover () Urlpatterns = Pat Terns (', # Examples: # URL (r ' ^$ ', ' mysit
Example Analysis of sys. argv parameter usage in python
This example describes how to use the sys. argv parameter in python. Share it with you for your reference. The specific analysis is as follows:
In the course of learning python, I have never understood the meaning of sy
As a concept, regular expressions are not unique to Python. However, regular expressions in Python have some minor differences in actual use.
This article is part of a series of articles about Python regular expressions. In the first article in this series, we'll focus on using regular expressions in Python and highli
This article mainly describes the Python implementation of other programs run four ways, in conjunction with the instance form of Python to perform other program related modules and functions of the use of skills, the need for friends can refer to the following
The examples in this article describe four ways Python implements other programs. Share to everyone fo
This example describes the use of the range () function in Python development. Share to everyone for your reference, as follows:
The range () function in Python is very powerful, so I think it is necessary to share with you
As described in its API:
If you don't need to iterate through a sequence of numbers, the built-in function range () comes in handy. It gener
one, python in the file, folder operations often used in the OS module and Shutil module common methods.
1. Get the current working directory, that is, the directory path of the current Python script work: OS.GETCWD ()
2. Return all files and directories under the specified directory name: Os.listdir ()
3. function to delete a file: Os.remove ()
4. Delete multiple directories: Os.removedirs (r "C:\
This article mainly introduces the while usage of the loop statement in python, and analyzes the usage of the while Statement. if you need it, refer to the example in this article to describe the while usage of the loop statement in python. Share it with you for your reference. The specific analysis is as follows:
Note the indentation of the while statement in
This article mainly introduces the inheritance code examples of classes in Python. This article provides the code and running effect directly. if you need it, you can refer to the inheritance compiling of C ++. Python is more concise, and the efficiency is very high. Below is a simple Python inheritance example.
The
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