Basics of Python Learning fifth day how to base data types

1, the list of basic operations Method 1, the list is one of the underlying data types in Python, other languages also have a list-like data type, such as JS called array, he is surrounded by [], each element is separated by commas, and he can hold a variety of data types such as:

You can take values based on indexes, slices, and steps, just as you do with string methods.

Li =['HHD','Rob a crossbow vv',2,'big guy .','to Anger','your Uncle',8,]print (li[5]) print (li[:5]) print (li[-1::-1]) #倒序取值print (li[1:6:2]) #可以加步长取值

2, increase, append, insert, Extend

li=['ll','888','jjhh',' like',' See',['Star','Galaxy','Universe'],8]# Li.append ('to learn'Append # Print (LI) # Li.insert at the end of the list (3,'Xian San'), insert can add # Print (LI) # Li.extend by index ('Yqeyey'to iterate, add each element to the smallest element and add a # print (LI)

Name_list = ['Traitors','of Christianity','it's all good.'] whileTrue:name=input ('Please enter the name of the new employee:')    ifName.upper () = ='Q': Break    Else: Name_list.append (name) print ('New employee%s was added successfully'%name) print (name_list)

3, delete, pop,, remove,,clear,,, del

li=['JFH','er','wer','Oh','Ask','wer',[' -','Add']] #li. Pop () #默认删除最后一个 #li.pop (1#根据索引删除, you can define a variable to accept the deleted value, and the pop delete return value #li.remove ('wer'#按照元素删除, the default is to delete only one, if there are two identical elements #li.clear () #清空列表中的数据, leave the empty list #del Li to delete the entire list #del li[:4] #del li[can be deleted based on the index tiles:7:2] You can also remove print (LI) with step size

4, change, change by index

Li =[' A',' -','ADN','ASD',['ci','Yu'],'wen6','Ash']# li[0]='9'#根据索引去改 (an element separated by commas) #li [2:5]='Hdshds'#把字符串的化成最小元素添加 #li[3]="' cozy ', ' yuan ', [' sxxzx '], ' 22uu '"Delete the original element and add it

5, check, according to index, slicing step to check, you can also for the loop to check

Li =[' A',' -','ADN','ASD',['ci','Yu'],'wen6','Ash']print (li[:5]) #根据切片和索引去查 forIinchLi:print (i)

6, other methods of operation

Li =[' A',' -','ADN','ASD','Qen6','Ash']#li.sort () #根据ascii sorting must be of the same data type #Li.sort (reverse=true) Reverse sort#li.reverse () FlipPrint(LI)

Li =[' A',' -','ADN','ASD','Qen6','Ash']Print(Li.count (' A'))#CountPrint(Li.index ('Ash'))#Indexed by ElementPrint(Len (LI))#List Length

7, Nesting of lists

# Li =[2, ' Zhen ', ' Xing ', 4,[' flower ', ' shh ', 66], ' people ']1,' capitalize the Xing's initials '2,'  Put Shh all caps '3,' put 66 +1 back in place '# # Li[2]=li[2].capitalize ()  #  # li[4][2]=li[4][2]+1#  li[4][1] = Li[4][1].upper ()# Print (LI)

2, tuple read-only (), by index, slicing

Tuples are called read-only lists, where data can be queried but cannot be modified, so the slicing of strings also applies to tuples. Example: ("A", "B", "C").

If there are other data types in the tuple, you can also modify them.

Other Range,len.

 for  in Range (100,0,-1):# as a list of numbers, the range    #(0,100,2) can also be added in step size, self-defined range,     #(100,0,-1)-1 can also be inverted to value    print(i)

Join: Use a string to make a connector that iterates over each element in the object, forming a new string

s='^'. Join (' Meizu beautiful phone ')print(s)

Basics of Python Learning fifth day how to base data types