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Using OpenSSL what does “unable to write 'random state'” mean?
...ame is known because neither RANDFILE nor HOME is set. (Versions up to 0.9.6 used file ".rnd" in the current directory in this case, but this has changed with 0.9.6a.)
So I would check RANDFILE, HOME, and permissions to write to those places in the filesystem.
If everything seems to be in order,...
Combine two columns of text in pandas dataframe
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600
if both columns are strings, you can concatenate them directly:
df["period"] = df["Year"] + d...
How to create a cron job using Bash automatically without the interactive editor?
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edited Jul 9 '16 at 15:20
Jean-Luc Barat
85788 silver badges1717 bronze badges
answered May 1...
update package.json version automatically
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npm version is probably the correct answer. Just to give an alternative I recommend grunt-bump. ...
How do I cast a string to integer and have 0 in case of error in the cast with PostgreSQL?
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I was just wrestling with a similar problem myself, but didn't want the overhead of a function....
How to generate all permutations of a list?
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Starting with Python 2.6 (and if you're on Python 3) you have a standard-library tool for this: itertools.permutations.
import itertools
list(itertools.permutations([1, 2, 3]))
If you're using an older Python (<2.6) for some reason or are j...
Generate an integer that is not among four billion given ones
... you to count how many numbers there are in the input file with any given 16-bit prefix, for all possible 16-bit prefixes in one pass through the input file. At least one of the buckets will have be hit less than 216 times. Do a second pass to find of which of the possible numbers in that bucket are...
Which one will execute faster, if (flag==0) or if (0==flag)?
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16 Answers
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How to implement a queue with three stacks?
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SUMMARY
O(1) algorithm is known for 6 stacks
O(1) algorithm is known for 3 stacks, but using lazy evaluation which in practice corresponds to having extra internal data structures, so it does not constitute a solution
People near Sedgewick have confirmed they a...
SQL Switch/Case in 'where' clause
...d it worked fine.
– Bob Probst
Oct 16 '08 at 0:48
Why are the @ needed? What do they do?
– Tadej...