大约有 47,000 项符合查询结果（耗时：0.0215秒） [XML]
How to remove an element from a list by index
...
del is overloaded. For example del a deletes the whole list
– Brian R. Bondy
Mar 9 '09 at 18:36
34
...
Circle line-segment collision detection algorithm?
...the code it seems you have assumed its 1 (so its just "removed"). Do these formulas have a name or something? Maybe I can look them up in detail on Wolfram.
– Mizipzor
Jul 6 '09 at 12:17
...
Getting the class name of an instance?
... classes). Your code might use some old-style classes. The following works for both:
x.__class__.__name__
share
|
improve this answer
|
follow
|
...
Does Python have an ordered set?
...
There is an ordered set (possible new link) recipe for this which is referred to from the Python 2 Documentation. This runs on Py2.6 or later and 3.0 or later without any modifications. The interface is almost exactly the same as a normal set, except that initialisation shoul...
How to dynamically load a Python class
...:
components = name.split('.')
mod = __import__(components[0])
for comp in components[1:]:
mod = getattr(mod, comp)
return mod
The reason a simple __import__ won't work is because any import of anything past the first dot in a package string is an attribute of the module yo...
How to serialize SqlAlchemy result to JSON?
...s some good automatic serialization of ORM models returned from DB to JSON format.
26 Answers
...
How to check a string for specific characters?
...e above...
s.find('$')==-1 # not found
s.find('$')!=-1 # found
And so on for other characters.
... or
pattern = re.compile(r'\d\$,')
if pattern.findall(s):
print('Found')
else
print('Not found')
... or
chars = set('0123456789$,')
if any((c in chars) for c in s):
print('Found')
els...
Weighted random numbers
...
There is a straightforward algorithm for picking an item at random, where items have individual weights:
1) calculate the sum of all the weights
2) pick a random number that is 0 or greater and is less than the sum of the weights
3) go throu...
Formatting numbers (decimal places, thousands separators, etc) with CSS
Is it possible to format numbers with CSS?
That is: decimal places, decimal separator, thousands separator, etc.
10 Answers...
Short description of the scoping rules?
...
Actually, a concise rule for Python Scope resolution, from Learning Python, 3rd. Ed.. (These rules are specific to variable names, not attributes. If you reference it without a period, these rules apply.)
LEGB Rule
Local — Names assigned in any ...