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. (actually based on QueryPerformanceCounter () on WIN32, which is more accurate than milliseconds)Import Time Print (Time.clock ()) Time.sleep (2) Print (Time.clock ())View Code5.datetime ModuleShow Current TimeImport datetime Print (Datetime.datetime.now ())View CodeThird, random moduleThe random module mainly has the following functionsImportRandomPrint(Random.random ())#randomly generate a floating-point number less than 1Print(Random.randint (1,3))#randomly generates an integer that can be

classes in the data. - -Many, many more ... the the a total of 150 data samples the evenly distributed over 3 subspecies the 4 petals per sample, calyx shape Description - " " the the " " the 2 dividing the training set and the test set94 " " theX_train, X_test, y_train, y_test =train_test_split (Iris.data, the Iris.target, thetest_size=0.25,98Random_state=33) About - " "101 3 K Nearest Neighbor Classifier learning model and prediction102 " "103 #standardization of training data and test

" " ? # print Self.name print ' normal method ' ? @classmethod def class_func (CLS): "" " defines a class method with at least one CLS parameter" "" ? print ' class method ' ? @staticmethod def static_func (): "" " defines a static method with no default parameter" "" ? print ' static method ' ? ? # Call the normal method F = Foo () f.ord_func () ? # Call class method Foo.class_func () ? # call static method

quotes, when to use single quotes, when to use double quotes, three quotes S1 = ' yangchen ' s2 = "yangchen" msg = "My name is Coy, I ' m years old!" Print (msg)Three quotes are usually quoted in a long stringmsg = "" Today I want to write a poem, praise my deskmate, you see his black short hair, like a fried chicken. "Print (msg)2, String +*(1) +S1 = ' Coy ' s2 = ' ssss ' Print (S1+S2)(2) *S1= ' Coy ' Print (s1*8)Third, str index slicing and simple operation1, String index sliceThrough the ind

the space behind it is wasted.So, if the list element can be calculated according to an algorithm, can we continue to calculate the subsequent elements in the process of the loop? This eliminates the need to create a complete list, which saves a lot of space. In Python, this side loop computes the mechanism, called the generator: Generator.There are a number of ways to create a generator. The first method is simple, as long as you change a list-gener

#!/usr/bin/env python#coding:utf-8import osimport reimport sysnum = []game_gen_path = ‘/data/bz-tw-and/‘for dirs in os.listdir(game_gen_path): if re.match(‘s\d+‘,dirs): num.append(dirs[1:])number = sorted(map(int,num))def callable(input_args): if input_args == ‘start‘: for i in number: script_abs_path = game_gen_path + ‘s‘ + str(i) + ‘/bin/hotup.sh‘ os.system(‘\nsh %s\n‘ % script_abs_path) print(‘ \

==commons.login) func () # and then we'll execute the following func, which means to execute the function inside the Commons else: print (" 404 ") # if Hasattr does not check, execute this sentence 404if __name__ = = ' __main__ ': # __name__ is the current module name and the module is named __main__ when the module is run directly. This means that when the module is run directly, the following code block will be run and the code block is not run when the module is imported.