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How to get the current time as datetime
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27 Answers
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How to get rspec-2 to give the full trace associated with a test failure?
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244
You must run rspec with -b option to see full backtraces
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Create Pandas DataFrame from a string
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A simple way to do this is to use StringIO.StringIO (python2) or io.StringIO (python3) and pass that to the pandas.read_csv function. E.g:
import sys
if sys.version_info[0] < 3:
from StringIO import StringIO
else:
from io import StringIO
import pandas as pd
TESTDATA = ...
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...t's an EXAMPLE.
BEGIN;
UPDATE testtable
SET somedata = 'blah'
WHERE id = 2;
-- Remember, this is WRONG. Do NOT COPY IT.
INSERT INTO testtable (id, somedata)
SELECT 2, 'blah'
WHERE NOT EXISTS (SELECT 1 FROM testtable WHERE testtable.id = 2);
COMMIT;
then when two run at once there are several f...
How to avoid warning when introducing NAs by coercion
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142
Use suppressWarnings():
suppressWarnings(as.numeric(c("1", "2", "X")))
[1] 1 2 NA
This supp...
How to extract base URL from a string in JavaScript?
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20 Answers
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On EC2: sudo node command not found, but node without sudo is ok
I have just installed nodejs on a new EC2 micro instance.
12 Answers
12
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Converting a date string to a DateTime object using Joda Time library
I have a date as a string in the following format "04/02/2011 20:27:05" . I am using Joda-Time library and would like to convert it to DateTime object. I did:
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Downloading images with node.js [closed]
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edited Feb 12 '14 at 10:11
answered Oct 5 '12 at 18:01
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How to take the first N items from a generator or list in Python? [duplicate]
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526
Slicing a list
top5 = array[:5]
To slice a list, there's a simple syntax: array[start:stop:...