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...有多大？有多少用户受益？”，回答不清这个问题，没有数据的支持，就不做。所以，产品经理要做很多数据挖拙和用户调研的工作，而不是拍拍脑袋，听极少数的用户抱怨就要开需求了。
2）产品经理也要管理和教育的。你要...
Split string using a newline delimiter with Python
...w.com%2fquestions%2f22042948%2fsplit-string-using-a-newline-delimiter-with-python%23new-answer', 'question_page');
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python generator “send” function purpose?
Can someone give me an example of why the "send" function associated with Python generator function exists? I fully understand the yield function. However, the send function is confusing to me. The documentation on this method is convoluted:
...
How do I migrate a model out of one django app and into a new one?
...ic.models.cat).
First make the changes in the source code and then run:
$ python manage.py schemamigration specific create_cat --auto
+ Added model 'specific.cat'
$ python manage.py schemamigration common drop_cat --auto
- Deleted model 'common.cat'
myproject/
|-- common
| |-- migrations
| |...
Removing numbers from string [closed]
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In Python 2.7 and above, you don't need the brackets around the list comprehension. You can leave them out and it becomes a generator expression.
– Kirk Strauser
Oct 12 '12 at 3:38
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Python using enumerate inside list comprehension
...appears the list comprehension's faster, not to mention more readable.
~$ python -mtimeit -s"mylist = ['a','b','c','d']" "list(enumerate(mylist))"
1000000 loops, best of 3: 1.61 usec per loop
~$ python -mtimeit -s"mylist = ['a','b','c','d']" "[(i, j) for i, j in enumerate(mylist)]"
1000000 loops, b...
Get protocol + host name from URL
...
You should be able to do it with urlparse (docs: python2, python3):
from urllib.parse import urlparse
# from urlparse import urlparse # Python 2
parsed_uri = urlparse('http://stackoverflow.com/questions/1234567/blah-blah-blah-blah' )
result = '{uri.scheme}://{uri.netloc}/...
multiprocessing.Pool: When to use apply, apply_async or map?
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Back in the old days of Python, to call a function with arbitrary arguments, you would use apply:
apply(f,args,kwargs)
apply still exists in Python2.7 though not in Python3, and is generally not used anymore. Nowadays,
f(*args,**kwargs)
is pr...
Rank items in an array using Python/NumPy, without sorting array twice
...array that represents the rank of each item in the first array. I'm using Python and NumPy.
11 Answers
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Python Nose Import Error
...ase, nosetests was the one in /usr/bin/nosetests, which was using /usr/bin/python. The packages in the virtualenv definitely won't be in the system path. The following fixed this:
source myvirtualenv/activate
pip install nose
which nosetests
/home/me/myvirtualenv/bin/nosetests
...