Python list, tuple operations

The Python list is used to hold a set of data represented by [].

1, List of common methods:

names = ['!alex','Eric','Rain','2kity']names.append ('Knochkapoor')#Add a single elementNames.count ('Alex')#statistics Alex NumberNames.insert (0,'Jlliu')#insert ' Julliu ' in the first positionNames.remove ('Jlliu')#delete ' Jlliu 'Names.pop ()#Delete the last one without parameters by defaultdel[Names[0]]#Delete the first element of a namesNames.index ()#Get subscriptNames.extend ()#List ExtensionNames.reverse ()#list top nephew, reversalNames.sort ()#List sort default First sign, then number, last letterNames.clear ()#clears the elements in the listNames[0:3]#take the first three values of the list, the slice of the list is Guxio regardless of the tailNAMES[-2:-1]#take the second value of the list, because the list's ' ignore the tail ' so the last one will not be taken outNames[-2:]#fetch the last two values of a listnames[:]#full slices of the listPrint(Names[::2])#An element that takes a list acrossEnumerate (names)#print out the subscript of the list forV,iinchEnumerate (names):#print out the subscript of the list    Print(v,i)

The use of list copy (), copy only one layer

name = ['ABC','BBB','CCC',['LJL','YHC',['Olace', 66,'MNBV'],'Lyw'],'FFF']c_name=name.copy ()Print(name)Print(c_name) name[3][2][0] ='SQL'name[3][1] ='QAZ'name[2] ='Zaq'Print(name)Print(C_name)#The above output # Note the list of elements in the list is changed, but the outermost list of the element quality is not changed['ABC','BBB','CCC', ['LJL','YHC', ['Olace', 66,'MNBV'],'Lyw'],'FFF']['ABC','BBB','CCC', ['LJL','YHC', ['Olace', 66,'MNBV'],'Lyw'],'FFF']['ABC','BBB','Zaq', ['LJL','QAZ', ['SQL', 66,'MNBV'],'Lyw'],'FFF']['ABC','BBB','CCC', ['LJL','QAZ', ['SQL', 66,'MNBV'],'Lyw'],'FFF']

Full copy () of the list

ImportCopy#introduction of a copy modulename = ['ABC','BBB','CCC',['LJL','YHC',['Olace', 66,'MNBV'],'Lyw'],'FFF']c_name=copy.deepcopy (name)Print(name)Print(c_name) name[3][2][0] ='SQL'name[3][1] ='QAZ'name[2] ='Zaq'Print(name)Print(c_name) Print results#at this time, C_name has a copy of the whole, not affected by the name['ABC','BBB','CCC', ['LJL','YHC', ['Olace', 66,'MNBV'],'Lyw'],'FFF']['ABC','BBB','CCC', ['LJL','YHC', ['Olace', 66,'MNBV'],'Lyw'],'FFF']['ABC','BBB','Zaq', ['LJL','QAZ', ['SQL', 66,'MNBV'],'Lyw'],'FFF']['ABC','BBB','CCC', ['LJL','YHC', ['Olace', 66,'MNBV'],'Lyw'],'FFF']

2, meta-group

Tuples are actually similar to the list, but also to save a group of numbers, it is not once created, it can not be modified, so it is called a read-only list, the expression of tuples with () to the table

There are only 2 methods, one is count, the other is index

Names = ('Alex','Eric','Rain','kity','Alex','Knoch')Print(Names.count ('Alex'))Print(Names.index ('Alex'))#If there are multiple identical elements, only the subscript of the first element is printed

Python list, tuple operations