1、在將多個(gè)以逗號(hào)分隔的值賦給一個(gè)變量時(shí)，多個(gè)值被打包成一個(gè)元組類型。當(dāng)我們將一個(gè)元組賦給多個(gè)變量時(shí)，它將解包成多個(gè)值，然后分別將其賦給相應(yīng)的變量。

# 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、解包時(shí)，如果解包出來(lái)的元素?cái)?shù)目與變量數(shù)目不匹配，就會(huì)引發(fā)ValueError異常。錯(cuò)誤信息為：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)

知識(shí)點(diǎn)擴(kuò)充：

python之打包，解包

#coding:utf-8#字符串，列表，元組打包與解包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))#首先將右邊的部分打包成一個(gè)元組，即（4，3），而后解包指派給變量x,yx, y = y, x #swap Variablesprint(’After swapping: x = %d, y = %d’ % (x, y))

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