python之语法错误之无法在设置变量中分配给运算符

我在 IDLE 中有这个语法错误:

SyntaxError: can't assign to operator

然后高亮显示一行的结尾，即以下代码的第 2 行:

date              = "Unknown" 
day-of-week       = "Unknown"      
time              = "Unknown" 
week              = "Unknown" 

如果我能得到任何帮助，我将不胜感激 :)

请您参考如下方法:

Python 将 day-of-week 解释为“day”减去“of”减去“week”。尝试改用 day_of_week。

展示这一点的示例代码。

>>> day = 3 
>>> of = 2 
>>> week = 4 
>>> day-of-week 
-3