大约有 30,000 项符合查询结果（耗时：0.0661秒） [XML]
Correct way to use get_or_create?
...
Following @Tobu answer and @mipadi comment, in a more pythonic way, if not interested in the created flag, I would use:
customer.source, _ = Source.objects.get_or_create(name="Website")
share
...
What is an ORM, how does it work, and how should I use one? [closed]
... here:
Java: Hibernate.
PHP: Propel or Doctrine (I prefer the last one).
Python: the Django ORM or SQLAlchemy (My favorite ORM library ever).
C#: NHibernate or Entity Framework
If you want to try an ORM library in Web programming, you'd be better off using an entire framework stack like:
Symfo...
Looping in a spiral
...
Here's my solution (in Python):
def spiral(X, Y):
x = y = 0
dx = 0
dy = -1
for i in range(max(X, Y)**2):
if (-X/2 < x <= X/2) and (-Y/2 < y <= Y/2):
print (x, y)
# DO STUFF...
if ...
How do I do word Stemming or Lemmatization?
...
If you know Python, The Natural Language Toolkit (NLTK) has a very powerful lemmatizer that makes use of WordNet.
Note that if you are using this lemmatizer for the first time, you must download the corpus prior to using it. This can b...
Match everything except for specified strings
...
It's valid Python, too.
– Joe Mornin
Mar 17 '15 at 22:13
...
What is the difference between __init__ and __call__?
...
In Python, functions are first-class objects, this means: function references can be passed in inputs to other functions and/or methods, and executed from inside them.
Instances of Classes (aka Objects), can be treated as if th...
How do you sort a list in Jinja2?
...
Ok, thanks. I did end up sorting in Python before sending to template: <code>movie_list = sorted( movie_list, key = lambda movie:movie.rating, reverse = True )</code> Too bad, it might be nice to let the template decide on the sort order! ( could ...
How do I get the different parts of a Flask request's url?
...
If you are using Python, I would suggest by exploring the request object:
dir(request)
Since the object support the method dict:
request.__dict__
It can be printed or saved. I use it to log 404 codes in Flask:
@app.errorhandler(404)
def ...
How can I correctly prefix a word with “a” and “an”?
...ter program that spits out only article text (the download is generally in XML format, along with non-article metadata too).
Find all instances of a(n).... and make an index on the following word and all of its prefixes (you can use a simple suffixtrie for this). This should be case sensitive, and y...
Adding a y-axis label to secondary y-axis in matplotlib
...
I don't have access to Python right now, but off the top of my head:
fig = plt.figure()
axes1 = fig.add_subplot(111)
# set props for left y-axis here
axes2 = axes1.twinx() # mirror them
axes2.set_ylabel(...)
...