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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:
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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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How to retrieve absolute path given relative
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readlink is the simple solution for linux, but this solution works on OSX too, so +1
– thetoolman
Aug 21 '17 at 23:58
1
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Get protocol + host name from URL
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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}/...
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...
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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How do I use the nohup command without getting nohup.out?
...>&1 & # runs in background, still doesn't create nohup.out
On Linux, running a job with nohup automatically closes its input as well. On other systems, notably BSD and macOS, that is not the case, so when running in the background, you might want to close input manually. While closing ...
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
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