On Jun 18, 8:56 pm, Matthew Wilson <m...@tplus1.com> wrote:
> Here's the code that I'm feeding to pylint:
>
> $ cat f.py
> from datetime import datetime
>
> def f(c="today"):
>
> if c == "today":
> c = datetime.today()
>
> return c.date()
>
> And here's what pylint says:
>
> $ pylint -e f.py
> No config file found, using default configuration
> ************* Module f
> E: 10:f: Instance of 'str' has no 'date' member (but some types could
> not be inferred)
>
> Is this a valid error message? Is the code above bad? If so, what is
> the right way?
>
> I changed from using a string as the default to None, and then pylint
> didn't mind:
>
> $ cat f.py
> from datetime import datetime
>
> def f(c=None):
>
> if c is None:
> c = datetime.today()
>
> return c.date()
>
> $ pylint -e f.py
> No config file found, using default configuration
>
> I don't see any difference between using a string vs None. Both are
> immutable. I find the string much more informative, since I can write
> out what I want.
>
> Looking for comments.
>
> Matt
>>> def midnight_next_day(initial_time="use today's date"):
if initial_time == "use today's date":
initial_time = datetime.now()
return initial_time.date() + timedelta(days=1)
>>> midnight_next_day()
Traceback (most recent call last):
File "<pyshell#24>", line 1, in <module>
midnight_next_day()
File "<pyshell#23>", line 6, in midnight_next_day
return initial_time.date() + timedelta(days=1)
AttributeError: 'str' object has no attribute 'date'
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