字母“n”在Python中是无效语法？

Question

它以前在我的程序中是一个变量名，现在突然Python在我的程序中返回字母'n'作为无效语法。在

你知道为什么吗？怎么解决这个问题吗？在

bad_input=True
while bad_input:
    bad_input=False
    User_Choice=int(input('Which frame would you like to choose(1,2,3 represent positive selections, 4,5,6 represent -1,-2, and -3 respectively')
    n = 3
    if User_Choice== int(1):
        Chunks=[RNA_Comp[i:i+n] for i in range(0, len(RNA_Comp), n)]
    if User_Choice== int(2):
        Chunks=[RNA_Comp[i:i+n] for i in range(1, len(RNA_Comp), n)]
    if User_Choice== int(3):
        Chunks=[RNA_Comp[i:i+n] for i in range(2, len(RNA_Comp), n)]
    else:
        print('Please select an integer value from 1 to 6')
        bad_input=True

Answer 1

您忘了在n = 3前一行中结束)