python基础-赋值，copy

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赋值运算
l1 = [1,2,3]
l2 = l1
l1.append(‘a’)
print(l1,l2)

copy
l1 = [1,2,3]
l2 = l1.copy()
print(l1,l2)
print(id(l1),id(l2))
l2.append(‘a’)
print(l1,l2)

l1 = [1,2,[4,5,6],3]
l2 = l1.copy()

print(l1,id(l1))
print(l2,id(l2))
l1.append(‘a’)
print(l1,l2)
l1[2].append(‘a’)
print(l1,l2)
print(id(l1[2]))
print(id(l2[2]))
import copy
l1 = [1,2,[4,5,6],3]
l2 = copy.deepcopy(l1)
print(l1,id(l1))
print(l2,id(l2))
l1[2].append(‘a’)
print(l1,l2)

l1 = [1,[1],2,3,4]
l2 = l1[:]
l1[1].append(‘a’)
l2 的结果是什么?

print(l1,id(l1))
print(l2,id(l2))
print(l1[1] is l2[1])

li = [‘alex’,‘taibai’,‘wusir’,‘egon’]
for i in li:
print(li.index(i),i)

for index,i in enumerate(li,1):
print(index,i)