Question

我使用列表来存储一些值。

示例代码：

for i in range(3):
  print i
  lst[i] = i+1
  print lst[i]

但是我收到这样的错误：

lst[i] = i+1
NameError: name 'lst' is not defined

是否需要在python中初始化数组？我的代码出了什么问题？

Answer 1

你应该将lst列为lst=[]

列表

lst=[]
for i in range(3):
  print i
  lst.append(i+1)
  print lst[i]

你可以做到的另一种方式;以上5行相当于以下单行列表理解，但打印除外：

lst=[i+1 for i in range(3)]

Answer 2

这是您的代码：

    for i in range(3):
        print i
        lst[i] = i+1
        print lst[i]

它有两个问题

1- you havn't initialize your list, the computer doesn't know yet that you are working with a list (like you do in programs where u keep track of a counter variable like count = count + i because it must have a seed value to start with)
2- you cannot append elements to a list with the assignment operator, use the append function for that.

所以这里是正确的代码：

    lst = []
    for i in range(3):
        print(i)
        lst.append(i+1)
    print(lst[i])

输出： 0 1 2 3

Answer 3

是的，你应该

lst=[]
for i in range(3):
  print i
  lst.append(i+1)
  print lst[i]

Answer 4

lst = []
for i in range(3):
    print i
    lst.append(i+1)
    print lst

python中的错误：name＆＃39; ...＆＃39;没有定义

4 个答案: