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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}/...
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
| |...
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...
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
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multiprocessing.Pool: When to use apply, apply_async or map?
...
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...
How do you check whether a number is divisible by another number (Python)?
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E.g. try x=10000000000000000; b = str(x/(x-1)); b in the python interpreter.
– NickD
Oct 18 '19 at 15:08
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What's the best way of scraping data from a website? [closed]
...ited for this task and the library/framework support is poor in this area. Python (Scrapy is a great starting point) and Clojure/Clojurescript (incredibly powerful and productive but a big learning curve) are great languages for this problem. Since you would rather not learn a new language and you a...
Different ways of clearing lists
...e complicated than one of these two lines when you want to clear a list in Python?
8 Answers
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Python Regex instantly replace groups
...re.sub:
result = re.sub(r"(\d.*?)\s(\d.*?)", r"\1 \2", string1)
This is Python's regex substitution (replace) function. The replacement string can be filled with so-called backreferences (backslash, group number) which are replaced with what was matched by the groups. Groups are counted the same ...