Python basics-list

1. create new_list1 [TV, Car, Cloth, Food] new_list2list ([TV, Car, Cloth, Food]) print (new_list1) print (new_list2) in list: [TV, car, Cloth, Food] [TV, Car... 1. create a list

New_list1 = ['TV', 'car', 'body', 'food']
New_list2 = list (['TV', 'car', 'body', 'food'])
Print (new_list1)
Print (new_list2)
Running result:
['TV', 'car', 'cloth ', 'food']
['TV', 'car', 'cloth ', 'food']

2. list common methods:

1. append

New_list1 = ['TV', 'car', 'body', 'food']
Print (new_list1)
New_list1.append ('water') # append 'water'
Print (new_list1)
Running result:
['TV', 'car', 'cloth ', 'food']
['TV', 'car', 'cloth ', 'food', 'water']

2. count

New_list1 = ['TV', 'car', 'body', 'food', 'food']
Print (new_list1.count ('food') # count the number of times 'food' is in the list => 2

3. extend

New_list1 = ['TV', 'car', 'body', 'food', 'food']
New_list1.extend ([11,22, 33, 'cart'])
Print (new_list1)
Running result:
['TV', 'car', 'cloth ', 'food', 'food', 11, 22, 33, 'car']

4. sort

New_list1 = ['TV', 'car', 'body', 'food', 'food']
Print (new_list1)
New_list1.sort () # forward sorting
Print (new_list1)
New_list1.sort (reverse = True) # reverse sorting
Print (new_list1)
Running result:
['TV', 'car', 'cloth ', 'food', 'food']
['Car', 'br', 'food', 'food', 'TV'] # positive sorting result
['TV', 'food', 'food', 'body', 'car'] # reverse sorting result

5. len

New_list1 = ['TV', 'car', 'food', 'body', 'food']
Print (len (new_list1) => 5 # Number of print elements

6. remove

New_list1 = ['TV', 'car', 'food', 'body', 'food']

New_list1.remove ('food ')
Print (new_list1)
Running result:
['TV', 'car', 'cloth ', 'food'] # remove deletes the first identical element found.

7. pop

New_list1 = ['TV', 'car', 'food', 'body', 'food']
New_list1.pop () # Delete an element randomly
Print (new_list1)
New_list1.pop (2) # specify to delete an element
Print (new_list1)
The running result is:
['TV', 'car', 'food', 'bry']
['TV', 'car', 'body'] #. The first element 'food' is deleted here'

8. index

New_list1 = ['TV', 'car', 'food', 'body', 'food']
Print (new_list1.index ('food') # return the index value of the specified element. if the same element is used, the first one is returned.
Running Result: 2

9. insert

New_list1 = ['TV', 'car', 'food', 'body', 'food']
New_list1.insert (2, 'hahahaha') # insert an element to a specified position
Print (new_list1)
The running result is:
['TV', 'car', 'hahaha', 'food', 'body', 'food']