大约有 44,000 项符合查询结果（耗时：0.0485秒） [XML]
How to extract the decision rules from scikit-learn decision-tree?
...
143
I believe that this answer is more correct than the other answers here:
from sklearn.tree impor...
Convert a String In C++ To Upper Case
...
|
edited Jul 31 at 6:54
ana
3766 bronze badges
answered Apr 9 '09 at 17:47
...
Is there any difference between “foo is None” and “foo == None”?
...
|
edited Mar 3 '17 at 14:56
answered Aug 25 '08 at 18:38
...
How to get everything after a certain character?
...
343
The strpos() finds the offset of the underscore, then substr grabs everything from that index ...
How do you build a Singleton in Dart?
...
360
Thanks to Dart's factory constructors, it's easy to build a singleton:
class Singleton {
st...
How to JSON serialize sets?
...owing that it can handle lists, dicts, and sets:
>>> data = [1,2,3, set(['knights', 'who', 'say', 'ni']), {'key':'value'}, Decimal('3.14')]
>>> j = dumps(data, cls=PythonObjectEncoder)
>>> loads(j, object_hook=as_python_object)
[1, 2, 3, set(['knights', 'say', 'who', 'n...
Immutability of Strings in Java
...
319
str is not an object, it's a reference to an object. "Hello" and "Help!" are two distinct Stri...
How do i find out what all symbols are exported from a shared object?
...
bdesham
13.3k1010 gold badges6767 silver badges112112 bronze badges
answered Aug 9 '09 at 4:17
Employed Russia...
In Python, if I return inside a “with” block, will the file still close?
...nusual way of course).
It is also mentioned in one of the examples of PEP-343 which is the specification for the with statement:
with locked(myLock):
# Code here executes with myLock held. The lock is
# guaranteed to be released when the block is left (even
# if via return or by an un...
Format numbers to strings in Python
...
Starting with Python 3.6, formatting in Python can be done using formatted string literals or f-strings:
hours, minutes, seconds = 6, 56, 33
f'{hours:02}:{minutes:02}:{seconds:02} {"pm" if hours > 12 else "am"}'
or the str.format function s...