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How to take column-slices of dataframe in pandas
...at']
# foo bar quz ant cat sat
.loc accepts the same slice notation that Python lists do for both row and columns. Slice notation being start:stop:step
# slice from 'foo' to 'cat' by every 2nd column
df.loc[:, 'foo':'cat':2]
# foo quz cat
# slice from the beginning to 'bar'
df.loc[:, :'bar']
# f...
Select between two dates with Django
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Temporarily disable auto_now / auto_now_add
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For those looking at this when they are writing tests, there is a python library called freezegun which allows you to fake the time - so when the auto_now_add code runs, it gets the time you actually want. So:
from datetime import datetime, timedelta
from freezegun import freeze_time
wit...
Is it worthwile to learn assembly language? [closed]
...t languages, from lots of different paradigms. Learning Java, C++, C#, and Python doesn't count, since they are all instances of the same paradigm.
As assembly is at the root (well, close to the root) of all languages, I for one say that it is worthwhile to learn assembly.
Then again, it's worthw...
Django: Get list of model fields?
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@mpen Wont claim it the best way or the most pythonic but below will/should get the values u would want to display in a view, so the headers of an HTML table if u will. As get_fields() returns a tuple, u can iterate over it and get the values that look like appname.Mo...
How to delete the contents of a folder?
How can I delete the contents of a local folder in Python?
24 Answers
24
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Error handling in getJSON calls
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If possible, this seems like the easiest solution. Here's a sample of the Python code I used. (Using Flask, Flask's jsonify f and SQLAlchemy)
try:
snip = Snip.query.filter_by(user_id=current_user.get_id(), id=snip_id).first()
db.session.delete(snip)
db.session.commit()
return jsoni...
Recursion or Iteration?
...a stack frames; the penalty for this varies. Also, in some languages like Python (more correctly, in some implementations of some languages...), you can run into stack limits rather easily for tasks you might specify recursively, such as finding the maximum value in a tree data structure. In these...
Search and replace in bash using regular expressions
...l" or PCRE extensions \s\S\w\W\d\D etc don't work as supported in php ruby python etc. These extensions are from Perl-compatible regular expressions (PCRE) and may not be compatible with other forms of shell based regular expressions.
These don't work:
#!/bin/bash
hello=ho02123ware38384you443d34o...
Elements order in a “for (… in …)” loop
...ink about objects as a hash map (table/whatever). In most languages (Java, Python, etc) these kinds of data structures are not sorted. So it is not surprising that this is the same case in JavaScript as well and it certainly does not make the specification wrong or stupid.
– Fe...