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How do I parallelize a simple Python loop?
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13 Answers
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Fastest way to replace NAs in a large data.table
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system.time(a_gdata = f_gdata(dt1))
user system elapsed
18.805 12.301 134.985
system.time(a_andrie = f_andrie(dt1))
Error: cannot allocate vector of size 305.2 Mb
Timing stopped at: 14.541 7.764 68.285
system.time(f_dowle(dt1))
user system elapsed
7.452 4.144 19.590 # EDIT h...
Which is the fastest algorithm to find prime numbers?
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mmcdole
83.7k6060 gold badges178178 silver badges221221 bronze badges
answered Jan 17 '09 at 18:45
Greg Hewgil...
Convert from ASCII string encoded in Hex to plain ASCII?
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233
A slightly simpler solution:
>>> "7061756c".decode("hex")
'paul'
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Java 8 stream reverse order
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edited Jan 29 '16 at 18:31
answered Jun 3 '14 at 9:13
Stu...
How do I modify fields inside the new PostgreSQL JSON datatype?
With postgresql 9.3 I can SELECT specific fields of a JSON data type, but how do you modify them using UPDATE? I can't find any examples of this in the postgresql documentation, or anywhere online. I have tried the obvious:
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How do you remove a specific revision in the git history?
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To combine revision 3 and 4 into a single revision, you can use git rebase. If you want to remove the changes in revision 3, you need to use the edit command in the interactive rebase mode. If you want to combine the changes into a single revisi...
How to apply shell command to each line of a command output?
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pixatlazaki
41355 silver badges1818 bronze badges
answered Apr 26 '10 at 3:34
Michael MrozekMichael Mrozek
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Display number with leading zeros
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In Python 2 (and Python 3) you can do:
print "%02d" % (1,)
Basically % is like printf or sprintf (see docs).
For Python 3.+, the same behavior can also be achieved with format:
print("{:02d}".format(1))
For Python 3.6+ the same behavior c...
Print list without brackets in a single row
...nstead.
– Anonymous
Dec 1 '19 at 9:43
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