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Python3 Module 2Standard modulesStochastic module randomSuppose importing import random as RFunction:R.random () returns a random number between [0, 1]R.getrandbits (nbit) returns the random number represented by the nbit in the form of a long integer;R.uniform (A, B) returns the random number in the interval (a, b)R.randrange ([Start,] stop [, step]) returns the random number in range (Start, stop, step);R.choice (SEQ) returns random elements from the sequence;R.shuffle (seq) randomly specifies

Python3 Set Set set concept of setsThe collection is a mutable containerData objects in the collection are in default (cannot be repeated multiple times)A collection is an unordered storage structure, and the data in the collection has no precedence relationshipA collection is a dictionary that is equivalent to a key and has no value, then the key is the collection's data,The elements within the collection must be immutable objectsThe collection is iterative (can be traversed with for and so on)

are not mentioned, all of which are Unicode codes for this symbol.D.GBK (16-bit)　　GBK is China's national code, the versatility is worse than UTF8, but UTF8 occupies more space than GBK.UTF8 is an international code, its versatility is better, foreigners can also browse the forum, and Chinese can be directly recognized, if your forum to do more internationalization that must be used UTF8.3. Storage unitsThe minimum computer unit is byte1byte = 8bit1KB = 1024byte1MB = 1024KB1GB = 1024MB1TB = 102

-8-*-#__Author__: mr_zhangfor i in range (0,10,2): print ("*" *10,i) for J in range: if j Gt;5: break Else: print (j)　　In two nested loops, the internal loop uses a break, the result is only affecting the internal loop, for the outer loop has no effect, so who, break out of the current loop body, then, here, some programming knowledge people will think of Contine, So how does this actually carry out, in fact, in the step execution program when the most c

The meaning of a slice literally is also well understood, which is to cut something into a fragment. In other words, a slice is an operation on data that intercepts a fragment of data, a string, a list, and a tuple that support slicing.#syntax: Action Object [start Position: End position: Step]#The default value for the start position is 0, the default value for the end position is the maximum length of the operand +1, the default value for the step is 1, the positive number is cut from left to

[1:]#print (' bytes ', N, Time.time ()-start)##For N in (100000, 200000, 300000, 400000):#data = B ' x ' *n#start = Time.time ()#B = Memoryview (data)#While B:#B = b[1:]#print (' Memoryview ', N, Time.time ()-start)Summary: Differences between the map, filter, and reduce three functionsThe map function can have multiple sequence parameters and can modify the value of item in the parameter sequenceThe filter function can have only one sequence parameter and cannot modify the value of item in the

reason, although the F1 racing theory speed of up to 400 km, but because the third ring road traffic jam speed of only 20 kilometers, so as a passenger, you feel the speed is always 20 kilometers.2, the code can not be encrypted, but what does it matter, no one will waste too much time to study your rotten code.3. Threads cannot take advantage of multiple CPUs.Installation of PythonFirst, depending on your version of Windows (64-bit or 32-bit), download the

" and "Environment variable"-"Select Path under System Variables"-"SELECT Edit"-" Copy the Python installation directory to the last side of the line and remember to break the English delimiter when copying the installation directory. " Unix LinuxPlatform InstallationPythonIn general, now the Linux default installation Python2, if not installed, follow the steps below to install: Open a Web b

Install Python Windows: 1234567 1、下载安装包https://www.python.org/downloads/2、安装默认安装路径：C:\python273、配置环境变量【右键计算机】--》【属性】--》【高级系统设置】--》【高级】--》【环境变量】--》【在第二个内容框中找到 变量名为Path 的一行，双击】 --> 【Python安装目录追加到变值值中，用 ； 分割】如：原来的值;C:\python27，切记前面有分号 Linux: 123 无需安装，原装Python