大约有 45,000 项符合查询结果（耗时：0.0443秒） [XML]
What does enumerate() mean?
...by Brett Slatkin and he shows another way to iterate over a list and also know the index of the current item in the list but he suggests that it is better not to use it and to use enumerate instead.
I know you asked what enumerate means, but when I understood the following, I also understood how en...
How to write inline if statement for print?
...ilarly when you write
x = a if b else 0
it means
x = (a if b else 0)
Now what would it print/assign if there was no else clause? The print/assignment is still there.
And note, that if you don't want it to be there, you can always write the regular if statement on a single line, though it's le...
Python read-only property
I don't know when attribute should be private and if I should use property.
10 Answers
...
What is the advantage of GCC's __builtin_expect in if else statements?
...there is a slow path and a fast path, and you as the programmer happen to know which path is most likely to be used.
– Adam Kaplan
Sep 20 '17 at 0:47
|
...
Merge PDF files
...
And now, pypi.python.org/pypi/PyPDF2 which is the successor project to PyPDF
– David Fraser
Aug 22 '13 at 10:04
...
What does “mro()” do?
...ase, and so on up to object (only works for new-style classes of course).
Now, with multiple inheritance...:
>>> class D(B, C): pass
...
>>> D.__mro__
(<class '__main__.D'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.A'>, <type 'objec...
What is the iPad user agent?
...
This answer is incorrect. From iOS 13 there is now no mention of iPad at all.
– CpnCrunch
Dec 16 '19 at 18:51
...
Calendar Recurring/Repeating Events - Best Storage Method
... between 1 and 5 potentially. repeat_weekday in the day of the week, 1-7.
Now assuming you are looping through the days/weeks to create a month view in your calendar, you could compose a query like this:
SELECT EV . *
FROM `events` AS EV
JOIN `events_meta` EM1 ON EM1.event_id = EV.id
AND EM1.meta_...
Detecting Unsaved Changes
...he form with the users previous entries - without firing the change-event. Now the form will be dirty, but the flag won't be set unless the user makes another edit.
– Oskar Berggren
Aug 31 '14 at 16:05
...
Getting number of elements in an iterator in Python
Is there an efficient way to know how many elements are in an iterator in Python, in general, without iterating through each and counting?
...