python之元组
1、定义一个元组：
例如：
In [77]: tupe=(12,33,23.32,"zhang","qing")
In [78]: tupeOut[78]: (12, 33, 23.32, 'zhang', 'qing')
In [79]: tupe1=(12,(12,34),"zhang")
In [80]: tupe1
Out[80]: (12, (12, 34), 'zhang')
In [81]: tupe2=("zhang",[12,34,"zhang"],23)
In [82]: tupe2
Out[82]: ('zhang', [12, 34, 'zhang'], 23)
In [83]: tupe3=('zhang',{"name":"zhang"},12)
In [84]: tupe3
Out[84]: ('zhang', {'name': 'zhang'}, 12)
2、访问元组（一）：
In [85]: tupe
Out[85]: (12, 33, 23.32, 'zhang', 'qing')
In [86]: tupe[0]
Out[86]: 12
In [87]: tupe[1]
Out[87]: 33
In [88]: tupe[2]
Out[88]: 23.32
In [89]: tupe[3]
Out[89]: 'zhang'
In [90]: tupe[1,3]
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-90-3f0c13dc8437> in <module>()
----> 1 tupe[1,3]
TypeError: tuple indices must be integers or slices, not tuple
In [91]: tupe[1:3]
Out[91]: (33, 23.32)
3、访问元组（二）：
In [92]: tupe1
Out[92]: (12, (12, 34), 'zhang')
In [93]: tupe1[0]
Out[93]: 12
In [94]: tupe1[1]
Out[94]: (12, 34)
In [95]: tupe1[2]
Out[95]: 'zhang'
In [96]: tupe1[1][1]
Out[96]: 34
In [97]: tupe1[1][0]
Out[97]: 12
4、修改元组：
注意：不能对元组进行修改
In [98]: tupe
Out[98]: (12, 33, 23.32, 'zhang', 'qing')
In [99]: tupe[1]
Out[99]: 33
In [100]: tupe[1]=123
---------------------------------------------------------------------------
TypeError 冷陵愁 Traceback (most recent call last)
<块八ipython-input-100-d8823ba5f314> in <module>()
----> 1 tupe[1]=123
TypeError: 'tuple' object does not support item assignment
In [101]: tupe[1]="zhang"
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-101-7e6f9e95e567> in <module>()
---->关塑 1 tupe[1]="zhang"
TypeError: 'tuple' object does not support item assignment
5、元组内置函数之count:
count 与字符串和列表中的用法相同
例如：
In [102]: tupe
Out[102]: (12, 33, 23.32, 'zhang', 'qing')
In [103]: tupe.index(12)
Out[103]: 0
In [104]: tupe.index(33)
Out[104]: 1
In [105]: tupe.index(3)
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-105-0a22a2aab0ff> in <module>()
----> 1 tupe.index(3)
ValueError: tuple.index(x): x not in tuple
In [106]: tupe.index('zhang',0,4)
Out[106]: 3
In [107]: tupe.index('zhang',0,3)
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-107-19c37b0692f1> in <module>()
----> 1 tupe.index('zhang',0,3)
ValueError: tuple.index(x): x not in tuple
6、元组的内置函数之index
index与字符串和列表中的用法相同
例如：
In [110]: tupe
Out[110]: (12, 33, 23.32, 'zhang', 'qing')
In [111]: tupe.count("zhang")
Out[111]: 1
In [112]: tupe.count("qing")
Out[112]: 1
In [113]: tupe.count(12)
Out[113]: 1
