List 在列表的第i个列表中追加值
b是一个列表，它还包含10个列表，列表的每个索引都包含列表本身。现在，当我尝试在第I个列表ob中附加一些值时，它会在所有列表中附加它。我不明白为什么？救命啊 代码：List 在列表的第i个列表中追加值,list,python-2.7,append,List,Python 2.7,Append,b是一个列表，它还包含10个列表，列表的每个索引都包含列表本身。现在，当我尝试在第I个列表ob中附加一些值时，它会在所有列表中附加它。我不明白为什么？救命啊 代码： a=[3,5,1,7,2,22,9,8,4,11] b=[[]]*10 d=10 for i in range(len(a)): b[i].append(a[i]) print b 输出： a=[3,5,1,7,2,22,9,8,4,11] b=[[]]*10 d=10 for i in rang
a=[3,5,1,7,2,22,9,8,4,11]
b=[[]]*10
d=10
for i in range(len(a)):
b[i].append(a[i])
print b
a=[3,5,1,7,2,22,9,8,4,11]
b=[[]]*10
d=10
for i in range(len(a)):
b[i].append(a[i])
print b
不要像本文建议的那样将其初始化为可变对象： 相反，请将列表改写为：
>>> b=[[] for _ in xrange(10)]
>>> b
[[], [], [], [], [], [], [], [], [], []]
>>> b[0].append(0)
>>> b
[[0], [], [], [], [], [], [], [], [], []]
a=[3,5,1,7,2,22,9,8,4,11]
b=[[] for _ in xrange(10)]
d=10;
for i in range(len(a)):
b[i].append(a[i])
print b
[[3], [], [], [], [], [], [], [], [], []]
[[3], [5], [], [], [], [], [], [], [], []]
[[3], [5], [1], [], [], [], [], [], [], []]
[[3], [5], [1], [7], [], [], [], [], [], []]
[[3], [5], [1], [7], [2], [], [], [], [], []]
[[3], [5], [1], [7], [2], [22], [], [], [], []]
[[3], [5], [1], [7], [2], [22], [9], [], [], []]
[[3], [5], [1], [7], [2], [22], [9], [8], [], []]
[[3], [5], [1], [7], [2], [22], [9], [8], [4], []]
[[3], [5], [1], [7], [2], [22], [9], [8], [4], [11]]