Python basic data type--list list

List:

The list is one of the underlying data types in Python, and other languages have data types similar to lists, such as JS called arrays, which are enclosed in [] and each element is separated by commas, and he can store various data types such as:

Li = [' Alex ', 123,ture, (Wusir), [All-in-all, ' xiaoming ',],{' name ': ' Alex '}]

Compared to strings, lists can store not only different data types, but also large amounts of data, 32-bit Python is limited to 536,870,912 elements, and 64-bit Python is limited to 1.,152,921,504,606,85e,+18 elements. And the list is ordered, there are index values, can be sliced, convenient to take value.

#列表能放字符串, numbers, lists, dictionaries, when none of the properties of the list are changed
Li = ['Alex', 100,true,[1,2,3],{'name': ' Taibai '}]

1. Index, slice, slice + step

Index

Li = ['Alex', 100,true,[1,2,3],{'name': ' Taibai '}]
Print (Li[0],type (li[0))
#运行结果 Alex <class ' str ' >

Slice + Step

Li = ['Alex', 100,true,[1,2,3],{'name':' Taibai ' }]print(Li[0:2])
Print (Li[0:3:2])
Print (Li[-1:1:-1])

2. Increase, delete, change, check

L1 = [' Alex ', ' Wusir ', ' Taibai ', ' Egon ', ' King Girl ', ' Wen Zhou Teacher ', ' Day of the day ']

Increase:

Append appended.

L1 = ['Alex','Wusir','Taibai','Egon','King Girl','Mr. Wen Zhou','Day Day']l1.append ('teacher Xiao Wen')Print(L1) #[' Alex ', ' Wusir ', ' Taibai ', ' Egon ', ' King Girl ', ' Wen Zhou Teacher ', ' Day of the Week ', ' Little Miss Wen ']

#循坏追加姓名, enter Q or Q to exit and print the list.

Name_list = [' Zhao three ', ' John Doe ']
While 1:
    Username = input (' Please enter a new employee name '). Strip ()
    If username.upper () = = ' Q ':
        Break
    Name_list.append (username)
Print (name_list)

Inser: Insert Add:

L1 = ['Alex','Wusir','Taibai','Egon','King Girl','Mr. Wen Zhou','Day Day']l1.insert (1,'Bao Yuan')Print(L1)

Expend: Iterative Append

L1 = ['Alex','Wusir','Taibai','Egon','King Girl','Mr. Wen Zhou','Day Day']l1.extend ('1111'#[' Alex ', ' Wusir ', ' Taibai ', ' Egon ', ' King Girl ', ' Wen Zhou Teacher ', ' Day ', ' 1 ', ' 1 ', ' 1 ', ' 1 ']l1.extend ('Alex'#[' Alex ', ' Wusir ', ' Taibai ', ' Egon ', ' King Girl ', ' Wen Zhou Teacher ', ' Day ', ' 1 ', ' 1 ', ' 1 ', ' 1 ', ' A ', ' l ', ' e ', ' X ']Print(L1)

Delete

Pop: According to the index to delete, pop (index), index, the default is not filled out the last element of the list, pop delete will return the deleted element

L1 = ['Alex','Wusir','Taibai','Egon','King Girl','Mr. Wen Zhou','Day Day']Print(L1.pop (0)) #返回 AlexPrint(L1) #[' Wusir ', ' Taibai ', ' Egon ', ' King Girl ', ' Wen Zhou Teacher ', ' Day of the day ']

3. Nesting of Lists

Python basic data type--list list