大约有 47,000 项符合查询结果（耗时：0.0404秒） [XML]
How do I move files in node.js?
... can I move files (like mv command shell) on node.js? Is there any method for that or should I read a file, write to a new file and remove older file?
...
What is the maximum float in Python?
...
For float have a look at sys.float_info:
>>> import sys
>>> sys.float_info
sys.floatinfo(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, min=2.2
250738585072014e-308, min_exp=-1021, min_10_exp=-3...
how to “reimport” module to python then code be changed after import
...
For Python 2.x
reload(foo)
For Python 3.x
import importlib
import foo #import the module here, so that it can be reloaded.
importlib.reload(foo)
...
Django self-referential foreign key
...
You can pass in the name of a model as a string to ForeignKey and it will do the right thing.
So:
parent = models.ForeignKey("CategoryModel")
Or you can use the string "self"
parent = models.ForeignKey("self")
...
Python Regex - How to Get Positions and Values of Matches
...an I get the start and end positions of all matches using the re module? For example given the pattern r'[a-z]' and the string 'a1b2c3d4' I'd want to get the positions where it finds each letter. Ideally, I'd like to get the text of the match back too.
...
Python pandas: fill a dataframe row by row
...ant; converting to a Series tells pandas
that you want to align the input (for example you then don't have to to specify all of the elements)
In [7]: df = pandas.DataFrame(columns=['a','b','c','d'], index=['x','y','z'])
In [8]: df.loc['y'] = pandas.Series({'a':1, 'b':5, 'c':2, 'd':3})
In [9]: df
...
Is it possible to delete an object's property in PHP?
...
unset($a->new_property);
This works for array elements, variables, and object attributes.
Example:
$a = new stdClass();
$a->new_property = 'foo';
var_export($a); // -> stdClass::__set_state(array('new_property' => 'foo'))
unset($a->new_property...
What differences, if any, between C++03 and C++11 can be detected at run-time?
...::operator int&& +a) == sizeof(Y);
}
That test-case doesn't work for C++0x in GCC (looks like a bug) and doesn't work in C++03 mode for clang. A clang PR has been filed.
The modified treatment of injected class names of templates in C++11:
template<typename T>
bool g(long) { return...
In Python script, how do I set PYTHONPATH?
...dd entries to sys.path. It's a list of directories that should be searched for Python packages, so you can just append your directories to that list.
sys.path.append('/path/to/whatever')
In fact, sys.path is initialized by splitting the value of PYTHONPATH on the path separator character (: on Li...
Two submit buttons in one form
I have two submit buttons in a form. How do I determine which one was hit serverside?
19 Answers
...