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; otherwise, it returns None (a null value in Python ). 3-3.Identifier. Why should we avoid double underscores (_) at the beginning and end of the variable name?[Answer]Because the variable name _ xxx _ has a special meaning for Python, this naming style should be avoided for common variables.

sequence query like a if-elif-else statement or a for loop.As you can see, the solution in Python is more powerful and concise for implementing the same functionality. 4. Conditional expressions (ternary operators) syntax : X if C else Y Use the following:>>> x, y =4, 3>>> smaller = x if x 5.while statements Grammar While Expression:suite_to_repeat Counting

knew * what she was doing. */PyErr_SetString (PyExc_SystemError, "NULL object passed to Py_BuildValue"); return v ;} Example: The left side is the function call form, and the right side is the returned Python value: Py_BuildValue("") NonePy_BuildValue("i", 123) 123Py_BuildValue("iii", 123, 456, 789) (123, 456, 789)Py_BuildValue("s", "hello") 'hello'Py_BuildValue("ss", "hello", "world") ('h

of the sequence. For example: #! /Usr/bin/python Output: $ Python seq. PY The Slice operator is a sequence name followed by a square bracket, which contains an optional number and is separated by a colon. Note that this is very similar to the index operator you are using. Remember that numbers are optional, while colons are required. shoplist[1:3]Returns a

files, you can import test first, then call it through Test.add (A, B), and of course, by using the From test import Add.Three, the characteristics of module import:(1), loading the execution module, that is, the import module's top-level code will be executed, usually enclosing the module in the global variables, classes and functions of the Declaration.(2), A module can be imported (import) multiple times, but only load (load) once.Why use a module?1, code reuse.2, the System name space div

defined.Application of arguments: How to use it, but follow the corresponding rules. 　　　　variable length parameter : variable length worth is the number of arguments is not fixed * number equal to the position parameterVariable length arguments defined by location: *Variable length arguments defined by keyword: * *def func (X,y,*args): #x =1 y=2, args= (3,4,5,6) Tuple formPrint (x, y)Print (args)Func (1,2,3,4,5,6) #实参为位置参数使用 *argsFunc (1,2,* (3,4,5,6)) #等同于 func (1,2,3,4,5,6)D:\

Python function Programming Guide (3): iterator details, python programming guide 3. iterator 3.1. Iterator Overview An iterator is a way to access elements in a set. The iterator object is accessed from the first element of the set until all elements are accessed. The iterator cannot be rolled back and can only be ite

Add by ZHJ: For a multi-line string connection, the 6th connection method is convenient and no additional space is added when connecting.Original: http://www.cnblogs.com/bigtreei/p/7892113.html1. PlusFirst, people with programming experience know that many languages use a plus sign to connect two strings, and Python also uses "+" directly to connect two strings;print ' Python ' + ' Tab 'Results:PythontabBac

' time.sleep (Random.randrange (3)) #消费者3秒内吃掉一个包子q =queue.queue () #队列p1 = threading. Thread (target=producer,args=[' chef 1 ', Q]) #目标是Producer这个函数, args is a reference p2=threading. Thread (target=producer,args=[' Chef 2 ', Q]) P1.start () P2.start () c1=threading. Thread (target=consumer,args=[' Zhang San ', Q]) c2=threading. Thread (target=consumer,args=[' John Doe ', Q]) C1.start () C2.start ()4.

be used in the function4, sum (A, B) at the time of execution, the "a" and "C" is passed to the SUM function5, return is the result when we call the function, the call function returns two number of the C=a+bb, various parameter types of the functionYou will often see how func (*args,**kwargs) functions are definedExample 1:1. Set a default value for variable bIf a value of B is specified when the argument is passed in, then there is a default value when B has no valuedef Funca (a,b=0): prin

][11, 9, 9, 9, 23, 9, 7, 11]>>> [(x+1,y+1) for x in range (3) for Y in range (5)][(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (2, 1), (2, 2), (2,3), (2, 4), (2, 5), (3, 1), (3, 2), (3, 3), (3