The third day PYTHON basic data Type-list-tuples

List lists

Methods available in the list class (total 11 types)

1. The original value was last appended

Li.append ()

2. Clear the list

Li.clear ()

3. Copy, Shallow copy

Li.copy ()

4. Count the number of occurrences of an element

Li.count (value)

5. Expand the original list, parameters: can iterate objects

Li.extend (objects that can be iterated)

6. Get the current value index position by value (left priority)

Li.index (value)

7. Inserting an element at the specified index location

Li.insert (index position, value)

8. Delete a value (1. Specify an index; 2. The last one by default) and get the deleted value

Li.pop ( index )

9. Delete the specified value from the list, the left priority

Li.remove (value)





3 Del[1]
4 Del[2:3]
5 Clear

10 Flipping the current list

Li.reverse ()

11 Sorting of Lists

Li.sort ()    #从小到大

Li.sort (reverse=true) #从大到小

List Description:
1. List format
2, the list can be nested any type
3, the list can be indexed value
4, the list can be sliced to value, the result is also a list
5. The list can be for loop, while loop
6, the list can be indexed modification, slice modification
7. The list can be used to determine whether the element is in the list
8, list can be used li[3][1][2][1] way to find in depth
9, list conversion, string conversion to a list by default for loop; A list conversion to a string requires you to write a for-loop one-by-one processing; if all of the lists are strings, you can convert them in join mode

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Tuple tuples
Methods provided in the tuple class: (2 total)
1. Gets the number of occurrences of the specified element in the tuple

Tu.count (Element)

2. Gets the position of the specified element in the tuple (left priority)

Tu.index (Element)

Tuple Description:

1, writing format, generally write the tuple when, recommended in the last to join,

2. Can be indexed

3, can be sliced

4. Can be used for loop

5. Can be converted to list, string

6, the first level element of the tuple cannot be modified/deleted/Added

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The third day PYTHON basic data Type-list-tuples