文档介绍：Introduction to Python
Data Structures
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List
Tuple
Dictionary
Data Structures
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Construction
Syntax: [elem1, elem2, …]
Heterogeneous, ordered sequence
Mutable
Example:
>>> list1 = [1, 'hello', 4+2j, ]
>>> list1
[1, 'hello', (4+2j), ]
>>> list1[0] = 'a'
>>> list1
['a', 'hello', (4+2j), ]
Lists
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Concatenation (+)
Syntax: list1 + list2
Example:
>>> [1, 'a', 'b'] + [3, 4, 5]
[1, 'a', 'b', 3, 4, 5]
Repetition (*)
Syntax: list * number
Example:
>>> [23, 'x'] * 4
[23, 'x', 23, 'x', 23, 'x', 23, 'x']
Lists - Operations
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Indexing operator: [ ]
Positive indices count from the left
Negative indices count from the right
Indexing
0 1 2 3 4 5 6
-7 -6 -5 -4 -3 -2 -1
a b c d e f g
sequence[0] == a sequence[-7] == a
sequence[6] == g sequence[-1] == g
sequence[2] == c sequence[-5] == c
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Two indices separated by a colon
Available for both strings and lists
Example
>>> sequence = [0, 1, 2, 3, 4, 5, 6, 7]
>>> sequence[1:4]
[1, 2, 3]
>>> sequence[2:-1]
[2, 3, 4, 5, 6]
Missing Index implies end point
>>> sequence[:2]
[0, 1]
>>> sequence[3:]
[3, 4, 5, 6, 7]
Slices
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