Python basics: 1. Data type (tuple)

Hint: Python version is 2.7,windows system

1. Tuples (tuple)

Tuple, similar to list, but once initialized, a tuple cannot be modified without adding, deleting, or modifying elements.

1>>> colors = ('Red','Orange','Yello')2>>>Colors3('Red','Orange','Yello')4>>>type (colors)5<type'tuple'>

Empty tuple

1 >>> color = ()2 >>> color3 ()

1 elements

1 >>> color = (1)      #这is the same as a mathematical parenthesis, so when there is only one element, add a comma at the end of the 2 >>> Color 3 14 >>> color = (1,)     #是这种 5 >>> color 6 (1,)

Modify elements, cannot be modified, and does not add or remove methods

1>>> colors[0] =' White'2 3 Traceback (most recent):4File"<pyshell#18>", line1,inch<module>5colors[0] =' White'6TypeError:'tuple' ObjectDoes not support item assignment

Other similar to list

1>>>Colors[0]2 'Red'3>>> colors[-1]4 'Yello'5>>> colors[0:1]6('Red',)7>>> colors[-1:-2]8 ()9>>> colors[-1:]Ten('Yello',) One>>> colors[-1:1] A () ->>> colors[-1:-1] - () the>>> colors[-2:-1] -('Orange',) ->>> colors[-3:-2] -('Red',)

When there is a list in a tuple

1>>> test = ('a','b','C', ['D','e','F'])2>>> test[3]3['D','e','F']4>>> Type (test[3])5<type'List'>6>>> test[3] = ['D']#You cannot modify the list7 8 Traceback (most recent):9File"<pyshell#38>", Line 1,inch<module>TenTEST[3] = ['D'] OneTypeError:'tuple'Object does notSupport Item Assignment A  - #You can modify the elements of a list ->>> Test[3][0] ='g' the>>> Test[3][1] ='h' ->>> test[3][2] ='I' ->>>Test -('a','b','C', ['g','h','I']) + #Delete List element ->>> test[3].pop () + 'I' A>>>Test at('a','b','C', ['g','h'])

In fact, the non-modification of the tuple refers to each element of the point of the address is unchanged, pointing to ' red ' cannot be changed to point to ' white ', when pointing to the list, the list can not be changed to other elements, but the list of elements may change

Python basics: 1. Data type (tuple)