examples of inheritance in python

to use Os.path.join (Dirpath, name). Auto-complete recursive enumeration via for loop for example: F:\aaa directory is such a file directory structure f:\aaa|--------1.txt| --------2.txt|--------3.txt|--------4 |-------5.txt |-------6.txt |-------7.txt Os.walk (Top, Topdown=true, Onerror=none, Followlinks=false) can get a ternary tupple (Dirpath, Dirnames, filenames), the first one for the starting path, The second is the folder under the starting path, and the third one is the file under the s

Examples of how to add and compare the combined values of the dictionary in Python. Sum of dictionary merge valuesWhen collecting and summarizing game data, some data is stored in dictionaries every day. When I want to collect statistics for multiple days, I need to merge the dictionaries.If the keys are the same, their values are added.The update method cannot be used, because the value of the same key is

-dimensional list becomes a two-dimensional list, the two list changes at the same timeThis is a shallow copy, cloning only the first layer listThe second list is a reference to the first listBased on the shallow copy, modify the copy out of the list, you can implement the concept of similar inheritanceDeep copyImport CopyCopy.copy (a_list): shallow copy, same as A_list.copy ()Copy.deepcopy (a_list): Deep copyDon't use it. Large amount of data memory consumptionTwo-dimensional listEach element i

.insert (1, ' abc ')SortList2.sort ()ReverseList2.reverse ()Delete and return a valueList.pop (1)Append elementList2.extend (' Qweq ')Tuple ()Tuples and lists are similarTuples and strings are not becoming-tuples can store a range of values-tuples are typically used in user-defined functions to safely take a set of worthwhile times, that is, the value of the tuple being used does not change.T= (1,a,)Split of a B c=t tupleCommon methods of dictionaries> Dictionary is the only type of mapping (has

This article mainly introduces the usage examples of super in Python, this article compares the general inheritance with the super inheritance, from the results of the run, ordinary inheritance and super inheritance are the same, but in fact their internal operating mechanism is different, this point in multiple inheritance is evident, Need friends can refer to the following Super is used to solve multiple

Let's take a look at an example: Copy Code code as follows: >>> def foo (*args, **kwargs): print ' args = ', args print ' Kwargs = ', Kwargs print '-----------------------' >>> if __name__ = = ' __main__ ':Foo (1, 2, 3, 4)Foo (a=1, b=2, c=3)Foo (1,2,3,4, A=1, b=2, c=3)Foo (' A ', 1, None, a=1, b= ' 2 ', c=3) The output results are as follows: Copy Code code as follows: args = (1, 2, 3, 4) Kwargs = {} ----------------------- args = () Kwargs

Careful use of variable length parametersPython supports variable-length parameter lists, which can be implemented by *arg, **kwargs these two special syntaxes. The following examples are used for variable length parameters:* Use *args to implement the variable parameter list: *args with AcceptA parameter list wrapped as a tuple to pass a non-critical parameter, and the number of parameters can be arbitrary. def sumfun (*args): Result = 0 for