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removed from the array, and if the second argument is omitted, all elements are deleted from the starting point to the end of the array. Splice () returns an array of deleted elements that return an empty array if no elements are deleted.var a=[1,2,3,4,5,6,7,8];a.splice (4); // return [5,6,7,8],a to [1,2,3,4] // return [2,3],a to [1,4] // return [4],a to [1]Splice () The first two parameters specify the array elements that need to be deleted, followed by any parameters that specify the eleme
the function that declares it and in any function nested within the body of the function. So in a function body, no matter where the variable is declared or even before it is declared, it can be used (without prompting for an error), but only after it has been declared and assigned, can it use the value assigned to it correctly. Therefore, in general, a good habit is to put the local variables to be declared in the function body at the top of the function body. var scope= "Global"; function f (
set at the beginning of the instance object creation. objects created from direct amounts of objects use Object.prototype as their prototypes, and objects created by new use the prototype property of the constructor as prototypes. Objects created by Object.create () use the first parameter as a prototype.To detect whether an object is a prototype of another object (or in a prototype chain), use the isPrototypeOf () method.var p={x:1}; // defining a prototype object var o=object.create (p);
system between each encoding, it can not recognize each other, will produce garbled.2, file storage, transmission, cannot be Unicode (because Unicode is 32 bit too large) can only be utf-8 utf-16 gbk,gb2312,asciid, etc.For English:STR: representation: s = ' Alex 'Encoding method: 00000001 UnicodeBytes: representation: s = B ' Alex 'Encoding method: 00000000 Utf-8, GBK ....For Chinese:STR: representation: s = ' China 'Encoding method: 00000010 UnicodeBytes: expression form: s = B ' \xe4\xb8\xad\
1. zip function1) How the ZIP function works when there is only one parameter.x = [1, 2, 3]x = zip (x)print XOutput: [(1,), (2,), (3,)]2) How the ZIP function works when there are no parameters.x = zip ()print XOutput: []3)x = [1, 2, 3]r = Zip (* [x] * 3)print R The result of the operation is:[(1, 1, 1), (2, 2, 2), (3, 3, 3)]It operates in such a way that:[x] generates a list of lists that have only one element x[x] * 3 generates a list of lists, it has 3 elements, [x, X, X]The meaning of Zip (
Chapter One: Basic knowledge1. Double slash: The operator that implements the divide>>>1//20Even if it is a floating-point number, the slash will perform the divide>>>1.0//2.00.02. Power (exponentiation) operator: Double star>>>2**38Tip: You can use the function POW instead of the operator, pow (2,3)3.16 Binary and octalHex: Front plus 0x, first is number 0>>>0xaf175Octal: Add 0o to Python in version 3.0, the first number is 0, the second is the lette
#列表可修改, the Yuan Zu cannota=['sdsd',]b=['SDS',]c=[a,b]#分片 :-#list函数#分片赋值#列表方法Lst.append (4) X.count (1) x.count ([up]) A.extend (b) a.index ("w" ) A.insert (3, "all")X.removeX.reverseX.sort#pop removes the list element and returns a value. Implementation data structure-stack, LIFO (LIFO), X.append (X.pop ()), FIFO, X.insert (X.pop (0)#sortX.sort (Key=len)y=sorted (x)#y元祖No list-like methods(a)#tuple函数# become a meta-ancestorPython Basic Learning Note
#模块#包#模块中有什么Dir L List features#文档Print range.__doc__#阅读源代码Print copy.__file__#标准库Sysosfileinput#集合, heap and double-ended queuesSet (range) Thecollection heap data structure is not independent of only one module containing some heap operations, called HEAPQ (6 functions) Double-ended queue#time#random#shelve#re# contains support for regular expressionsPython Basic Learning Note--python Basic Tutorial (2nd
"Basic Python Tutorial (second edition)" Learning notesBasic part (1th chapter)IdeWindows:idle (GUI), Eclipse+pydev; Python (command line);Linux/unix:python>>> 1/2=0 note divisible by 0.>>> from __future__ Import Division performing normal divisionPython-qnew Perform a normal divisionDivide, 1//2=0;% take the remainder
functions. For example: POW is used to calculate standard functions such as Solutionkeys GT;GT;GT;2**38GT;GT;GT;POW (2.3) 8pow, called built-in functions, or you can customize functions. The 1.9 module can be thought of as an extension that imports into Python to enhance its functionality and is imported using the Import command. For example: Import the Math module with import and use >>>importmath>>>math.floor (32.9) in the format "module. function"
Basic Python Tutorial (second edition) Learning Note Strings (Chapter 3rd)All basic sequence Operations (index, Shard, multiply, Judge membership, seek length, maximum minimum) also apply to strings.The string is not to be changed;The left side is the format string, and the right side is the value that needs to be formattedprint '%s=%d '% (' x ', ') ==> x=100% in
Basic Python Tutorial (second edition) Learning note files and materials (11th)Open File:Open (Filename[,mode[,buffering]])Mode is the pattern of reading and writing filesF=open (R ' c:\somefile.txt ') #默认是读模式+ means can read and write, R read mode, W write mode, a append mode, b binary mode;The newline character is \ r \ n in Windows, and in Unix,
() if user== Username and Passwd==password:print ("\033[32;1muser has passed authentication\033[0m") Res=func (*args,**kwargs) # print ("---after authentication---") #保留要装饰函数home的输出结果 r Eturn Res else:exit ("\033[31;1minvalid username or password\033[0m") elif au th_type== "LDAP": Print ("Engage the yarn LDAP, will not ....") ") return wrapper return Outer_authdef index (): Print (" Welcome to Index page ") @auth (auth_type=" local ") def Hom E (): Print ("Welcome to Home Pag
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