list
This is a list :
classmates = ['Michael', 'Bob', 'Tracy'] //内部数据类型可以不同The same len() function can get the length:
len(classmates)Take out the list contents:
classmates[0]
classmates[-1]
Append elements at the end of the list:
classmates.append('Adam')Insert the specified position:
classmates.insert(1, 'Jack')Remove elements from the end of a list:
classmates.pop()// can specify the locationclassmates.pop(i)
To replace an element with another element
classmates[1] = 'Sarah'A list element can also be another list
>>> s = ['python', 'java', ['asp', 'php'], 'scheme'] >>> len(s) 4 Note that sthere are only 4 elements, of which s[2]is another list, which is easier to understand if you split it up:
>>> p = ['asp', 'php']
>>> s = ['python', 'java', p, 'scheme'] To get it, it can 'php'be written p[1]or s[2][1], so it scan be regarded as a two-dimensional array, similar to three-dimensional, four-dimensional... arrays, but it is rarely used.
If there is no element in a list, it is an empty list, and its length is 0:
>>> L = []
>>> len(L)
0
tuple
Tuples are similar to lists, but immutable, so the code is safer
Special attention is needed when the tuple locates only one element: add, disambiguate
>>> t = (1,)
>>> t
(1,)
This is a mutable tuple
>>> t = ('a', 'b', ['A', 'B']) >>> t[2][0] = 'X' >>> t[2][1] = 'Y' >>> t ('a', 'b', ['X', 'Y'])In fact, the list is changed, and the invariant of tuple is that "pointing to the same" still points to that list