A. Introduction of random packets, randomly number of packets import random to generate integers in random range: random.randint (1,100) randomly remove an element from a sequence Random.choice ("abc") Generates a random decimal random.random () generates a decimal number with a specified length of # # random.random () *100# generates a decimal of 3-bit integers random.random () *1000 generates an integer int of the specified digits ( Random.random () *1000) disrupts the order of the internal elements of the list a=[1,2,3,4,5]random.shuffle (a) print ab. Read:>>> lista=[1,2,3,4]>> > Print lista[0]1>>> print lista[-1]4>>> print lista[1]2>>> print lista[-2]3c change:>> > lista[0]=lista[0]+10>>> lista[1]=20>>> Print lista[11, 3, 4]d traverse:>>> for I in Lista:.. . Print I ... 112034e censored:>>> lista=[1,2,3,4]>>> del lista[-1]>>> del lista[0]>>> print lista[2, 3] F add:>>> lista[2, 3]>>> lista.append ("abc") >>> lista[2, 3, ' abc ']>>> lista.append ([ ) >>> lista[2, 3, ' abc ', [1, 2, 3]]>>> lista.extend ([4,5,6]) >>> print lista[2, 3, ' abc ', [ 1, 2, 3], 4, 5, 6]>>> Lista.insert (1,1000) >>> lista[2, 1000, 3, 'ABC ', [1, 2, 3], 4, 5, 6]g Consolidated List:>>> a=[1,2,3]>>> b=[4,5,6]>>> a+b[1, 2, 3, 4, 5, 6]>>>& Gt;>>f Consolidated List:>>> a=[1,2,3]>>> b=[4,5,6]>>> a+b[1, 2, 3, 4, 5, 6]>>>>> >g stored functions in the list, and subsequent calls to stored functions:>>> sum<function sum at 0x000000000231df98>>>> a.append (sum) > >> print A[1, 2, 3, <function sum at 0x000000000231df98>]>>> a[-1]<function sum at 0x000000000231d F98>>>> a[-1] [3>>> print a[-1] (3h) .......... Gorgeous split line ....... ....... SWOT-opportunity/risk/advantage/disadvantage function is not a method, but in an object-oriented class, it is called a method. Examples of functions: Example: Addition and division short-circuit statement: none, no return value and Pass import random a range of random values: Random.randint (A, B) Random decimal values in a sequence (str/list/tuple): Random.choice () Fetch (0,1): Random.random () disrupts the order of the internal elements of the list: Random.shuffler (a) Introducing random packets, randomly number of packages import random to generate integers in random range: random.randint (1,100) randomly extracts an element from a sequence Random.choice ("abc") Generates a random decimal random.random () generates a decimal number with a specified length of # random.random () *100# generates a fractional number of 2-bit integers random.randoM () *1000 the integer int (random.random () *1000) that generates the specified number of digits disrupts the order of the internal elements of the list a=[1,2,3,4,5]random.shuffle (a) print A example: randomly generated 135 mobile phone number: List to add elements to the list: List.append (), can be put into variables, can also be put into functions. Delete entire List:del list Delete the element at the specified location (1th): del list[0] Delete a value (1th): List.remove (123) List can put list (full list): Listc.append ( Lista) Add all the values in Lista and Listb to LISTC: listc.extend (lista) list read value:list[0]/list[1] "Teacher Note:" Introduce the random package, Random number of packets import random generates integers in random range: random.randint (1,100) randomly extracts an element from a sequence Random.choice ("abc") generates a random fractional random.random () Generates a decimal number with a specified length # random.random () to generate a 2-bit integer, *100# generates a decimal random.random () of 3-bit integers *1000 generates an integer int (random.random () *1000) of the specified number of digits A=[1,2,3,4,5]random.shuffle the internal element order of the list (a) print A------------------------------------------------------------------------------>>> lista=[1,2,3,4]> >> lista[0]1>>> lista[1]2>>> lista[2]3>>> lista[3]4>>> lista[4]Traceback ( Most recent call last): File "<stdin>", line 1, in <module>indexerror:list index out of range>>>>& Gt;> for I in Lista: ... Print I ... 1234>>> del A[-1]traceback (most recent): File ' <stdin> ', line 1, in <module>nameerror:name ' A ' is not defined>>>>>> del lista[-1]>>> lista[1, 2, 3]>>>----------------------- ---------------->>> del lista[1]>>> lista[1, 3]>>> lista.remove (1) >>> lista[3] >>> Lista.remove (3) >>> lista[]>>> lista.remove (3) Traceback (most recent call last): File " <stdin> ", line 1, in <module>valueerror:list.remove (x): X not in List>>>>>>>>> Lista=[1,2,3]>>> listb=[4,5,6]>>> listc=[]>>> listc.append (lista) >>> Listc.append (LISTB) >>> print listc[[1, 2, 3], [4, 5, 6]]--------------------------------------->>> Lista=[1,2,3,1,3,1]>>> lista.remove (1) >>> lista[2, 3, 1, 3, 1]>>> lista.remove (1) >> > lista[2, 3, 3, 1]>>> lista.remove (1) >>> Lista[2, 3, 3]--------------------------------------->>> a=[10,20,30]>>> b=[1,2,3]>>> B.append (a) >>> b[1, 2, 3, [Ten, 30]]>>> B.extend (a) >>> print b---------------------------------------Read:>>> lista=[1,2,3,4]>>> print lista[0]1>>> Print lista[-1]4>>> print lista[1]2>>> print lista[-2]3---------------------------------------change: >>> lista[0]=lista[0]+10>>> lista[1]=20>>> Print lista[11, 3, 4]---------------------- -----------------Traverse:>>> for i in Lista: ... print i ... 112034---------------------------------------Delete:>>> lista=[1,2,3,4]>>> del lista[-1]>>> Del lista[0]>>> print lista[2, 3]---------------------------------------increase:>>> lista[2, 3]>> > Lista.append ("abc") >>> lista[2, 3, ' abc ']>>> lista.append ([]) >>> lista[2, 3, ' ABC ', [1, 2, 3]]>>> lista.extend ([4,5, 6]) >>> print lista[2, 3, ' abc ', [1, 2, 3], 4, 5, 6]>>> Lista.insert (1,1000) >>> lista[2, 1000, 3, ' abc ', [1, 2, 3], 4, 5, 6]---------------------------------------Consolidated List:>>> a=[1,2,3]>>> b=[4,5,6] >>> a+b[1, 2, 3, 4, 5, 6]>>>>>>---------------------------------------the stored function in the list, and subsequent calls to the stored function: >>> sum<function sum at 0x000000000231df98>>>> a.append (sum) >>> print a[1, 2, 3, < function sum at 0x000000000231df98>]>>> a[-1]<function sum at 0x000000000231df98>>>> a[-1] ( 3>>> Print A[-1] 3
Python Preview-section III
