空list赋值

list=[]

i =0

list[i] =1

Traceback (most recent call last):

  File "D:\ProgramData\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 3267, in run_code

    exec(code_obj, self.user_global_ns, self.user_ns)

  File "<ipython-input-4-28c9e44edb79>", line 1, in <module>

    list[i] =1

IndexError: list assignment index out of range

list[0]=1

Traceback (most recent call last):

  File "D:\ProgramData\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 3267, in run_code

    exec(code_obj, self.user_global_ns, self.user_ns)

  File "<ipython-input-5-692d9d6c3702>", line 1, in <module>

    list[0]=1

IndexError: list assignment index out of range

list1=[]

print(list1)

[]

for i,x in enumerate(list1):

    print(i,x)

list1.append(1)

print(list1)

[1]

　　即：空的list不能直接用角标赋值，会报错

要用append进行填充

或者下面这样：

list1=[]

list2=[1,2,3]

list1=list2

list1

Out[17]: [1, 2, 3]