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Selecting/excluding sets of columns in pandas [duplicate]
I would like to create views or dataframes from an existing dataframe based on column selections.
9 Answers
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Checking if a string can be converted to float in Python
...ent)
except ValueError:
print "Not a float"
..it's simple, and it works
Another option would be a regular expression:
import re
if re.match(r'^-?\d+(?:\.\d+)?$', element) is None:
print "Not float"
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Programmatically Determine a Duration of a Locked Workstation?
How can one determine, in code, how long the machine is locked?
8 Answers
8
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SQL query to group by day
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Gone Coding
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answered Nov 1 '09 at 21:22
Anwar ChandraAn...
Gunicorn worker timeout error
I have setup gunicorn with 3 workers 30 worker connections and using eventlet worker class. It is setup behind Nginx. After every few requests, I see this in the logs.
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how to override action bar back button in android?
I want to customize the activity back button in action bar, not in hard key back button. I have overriden the onBackPressed() method. It works with my emulator back button, but not with action bar back button.
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What columns generally make good indexes?
...uppose, we have a table named buyers where the SELECT query uses indexes like below:
SELECT
buyer_id /* no need to index */
FROM buyers
WHERE first_name='Tariq' /* consider to use index */
AND last_name='Iqbal' /* consider to use index */
Since "buyer_id" is referenced in the SELECT portion, M...
What is the difference between self-types and trait subclasses?
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It is predominately used for Dependency Injection, such as in the Cake Pattern. There exists a great article covering many different forms of dependency injection in Scala, including the Cake Pattern. If you Google "Cake Pattern and Scala", you'll get many links, including presentations and v...
Safe integer parsing in Ruby
...those starting with 0x for hex and 0b for binary, and potentially more tricky numbers starting with zero that will be parsed as octal.
Ruby 1.9.2 added optional second argument for radix so above issue can be avoided:
Integer('23') # => 23
Integer('0x23') ...
Any recommendations for a CSS minifier? [closed]
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The YUI Compressor is fantastic. It works on JavaScript and CSS. Check it out.
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