Which part of the loop is it going through in this class frame?
When we want to set attributes of `self`, we should do it explicitly.
Not like `this.` in java or C#, `self.` is needed in python.
So, the method
> def print_time(self):
> time = '6:30'
1. set a local variable `time` as '6:30'
2. print `time` which is an attribute of `self`
Two `time` s are different.
It runs line-by-line. `__init__` works at the insantiation.
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