python元组打包和解包过程详解

1、在将多个以逗号分隔的值赋给一个变量时，多个值被打包成一个元组类型。当我们将一个元组赋给多个变量时，它将解包成多个值，然后分别将其赋给相应的变量。

# 打包a = 1, 10, 100print(type(a), a) # <class ’tuple’> (1, 10, 100)# 解包i, j, k = aprint(i, j, k) # 1 10 100

2、解包时，如果解包出来的元素数目与变量数目不匹配，就会引发ValueError异常。错误信息为：too many values to unpack（解包的值太多）或not enough values to unpack（解包的值不足）。

a = 1, 10, 100, 1000# i, j, k = a # ValueError: too many values to unpack (expected 3)# i, j, k, l, m, n = a # ValueError: not enough values to unpack (expected 6, got 4)

知识点扩充：

python之打包，解包

#coding:utf-8#字符串，列表，元组打包与解包aString = ’abc’aList = [1, 2, 3]aTuple = ’a’, ’A’, 1print(’Unpacking string......’)first, second, third = aStringprint('string values:', first, second, third)print(’nUnpacking list......’)first, second, third = aListprint('string values:', first, second, third)print(’nUnpacking tuple......’)first, second, third = aTupleprint('string values:', first, second, third)#swapping two valuesx = 3y = 4print(’nBefore swapping: x = %d,y =%d’ % (x, y))#首先将右边的部分打包成一个元组，即（4，3），而后解包指派给变量x,yx, y = y, x #swap Variablesprint(’After swapping: x = %d, y = %d’ % (x, y))

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