list删除方面的

 lst = ["我不是药神", "西游记", "西红柿首富", "天龙八部"]
#
# # lst.clear()
# # list在循环的时候不能删. 因为会改变索引
# del_lst = []
# for el in lst:
# del_lst.append(el) # 记录下来要删除的内容
#
# for el in del_lst: # 循环记录的内容
# lst.remove(el) # 删除原来的内容
# print(lst)

# lst = ["周杰伦", "周润发", "周星星", "马化腾", "周树人"]
# 删除掉姓周的人的信息
# del_lst = []
# for el in lst:
# if el.startswith("周"):
# del_lst.append(el)
#
# for el in del_lst:
# lst.remove(el)
# print(lst)

# 字典也不能在循环的时候更改大小
# dic = {"a":"123", "b":"456"}
# for k in dic:
# dic.setdefault("c", "123")