大约有 45,000 项符合查询结果（耗时：0.0178秒） [XML]
Operation on every pair of element in a list
...
233
Check out product() in the itertools module. It does exactly what you describe.
import iterto...
rspec 3 - stub a class method
I am upgrading from rspec 2.99 to rspec 3.0.3 and have converted instance methods to use allow_any_instance_of , but haven't figured out how to stub a class method. I have code like this:
...
No secret option provided to Rack::Session::Cookie warning?
I am running Rails 3.2.3, Ruby 1.9 under Fedora 17. I get this warning, when I run rails s , and how do I fix?
7 Answers
...
Why is conversion from string constant to 'char*' valid in C but invalid in C++
...
3 Answers
3
Active
...
NameError: global name 'unicode' is not defined - in Python 3
...
Python 3 renamed the unicode type to str, the old str type has been replaced by bytes.
if isinstance(unicode_or_str, str):
text = unicode_or_str
decoded = False
else:
text = unicode_or_str.decode(encoding)
decoded =...
NameError: global name 'xrange' is not defined in Python 3
...
You are trying to run a Python 2 codebase with Python 3. xrange() was renamed to range() in Python 3.
Run the game with Python 2 instead. Don't try to port it unless you know what you are doing, most likely there will be more problems beyond xrange() vs. range().
For the recor...
Looping over a list in Python
...with sublists in it. I want to print all the sublists with length equal to 3.
4 Answers
...
How to drop columns by name in a data frame
...
389
You should use either indexing or the subset function. For example :
R> df <- data.fram...
How to create abstract properties in python abstract classes
...
3 Answers
3
Active
...
Python - abs vs fabs
...(-2))
Out[7]: int
In [8]: type(abs(-2.0))
Out[8]: float
In [9]: type(abs(3+4j))
Out[9]: float
In [10]: type(math.fabs(-2))
Out[10]: float
In [11]: type(math.fabs(-2.0))
Out[11]: float
In [12]: type(math.fabs(3+4j))
---------------------------------------------------------------------------
Type...