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Create table in SQLite only if it doesn't exist already
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answered Nov 4 '10 at 15:06
David WoleverDavid Wolever
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How does the Brainfuck Hello World actually work?
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+100
1. Basics
To understand Brainfuck you must imagine infinite array of cells initialized by 0 each.
...[0][0][0][0][0]...
When bra...
How do I update if exists, insert if not (AKA “upsert” or “merge”) in MySQL?
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10
Yeah, I believe SQL Server's equivalent is called MERGE. In general, the concept is often referred to as "UPSERT".
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Python != operation vs “is not”
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310
== is an equality test. It checks whether the right hand side and the left hand side are equal ...
Algorithm to find top 10 search terms
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edited Jul 17 '10 at 11:53
answered Jul 15 '10 at 23:35
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Types in MySQL: BigInt(20) vs Int(20)
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answered Jun 28 '10 at 20:20
Bill KarwinBill Karwin
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What does `kill -0 $pid` in a shell script do?
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answered Jun 13 '12 at 10:16
dwalterdwalter
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Removing duplicates from a list of lists
...sort, dogroupby, donewk:
resk = f(k)
assert k == savek
print '%10s %s' % (f.__name__, sorted(resk))
Note the sanity check (performed when you just do python nodup.py) and the basic hoisting technique (make constant global names local to each function for speed) to put things on equal f...
How can I use if/else in a dictionary comprehension?
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MarcinMarcin
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31
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Does the ternary operator exist in R?
... %?% rnorm(5) %:% month.abb
## [1] 0.05363141 -0.42434567 -0.20000319 1.31049766 -0.31761248
FALSE %?% rnorm(5) %:% month.abb
## [1] "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"
# or, more generally
condition %?% value1 %:% value2
It actually works if you define the op...