python陷井：for循环中list（列表）remove、de

例1

list1 = ['1','2','3','4','5']

for i in list1:

    list1.remove(i)

print (list1)

========================================

['2', '4']

>>>

例2

list2 = ['1','2','3','4','5']

for i in list2:

    j=list2.index(i)

    del list2[j]

print (list2)

========================================

['2', '4']

>>>

#预期删掉list中的所有字符，结果还有两个字符没删掉

解决方法：

list1 = ['1','2','3','4','5']

list2=list1

for i in list2:

    list1.remove(i)

print (list1)