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How to calculate time difference in java?
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Just like any other language; convert your time periods to a unix timestamp (ie, seconds since the Unix epoch) and then simply subtract.
Then, the resulting seconds should be used as a new unix timestamp and read formatted in whatever format you want.
Ah...
“Variable” variables in Javascript?
...You can use the JavaScript eval(str) function.
What this function does is convert the string provided into JS code, then executes it.
For example:
eval("console.log('hello world')"); // Logs hello world
So to use it as a variable variable, you can do the following:
var a = "hello";
var hello =...
Selecting a row of pandas series/dataframe by integer index
...access to the pandas table, one can also consider numpy.as_array option to convert the table to Numpy array as
np_df = df.as_matrix()
and then
np_df[i]
would work.
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Play audio with Python
...k like it can play .mp3 files without external libraries. You could either convert your .mp3 file to a .wav or other format, or use a library like PyMedia.
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Python datetime to string without microsecond component
...er answer says "take the current time, set the microseconds to 0, and then convert it to a string somehow".
– Sven Marnach
Jan 14 '14 at 14:41
3
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Find intersection of two nested lists?
...(set.intersection, it, set(next(it, []))). Both version doesn't require to convert all input lists to set. The latter is more memory efficient.
– jfs
Dec 5 '12 at 6:41
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How to view UTF-8 Characters in VIM or Gvim
...t fileencoding=utf8 option so you won't run into the most confusing "Can't convert some character" error when saving.
– Maxim Sloyko
Mar 4 '11 at 12:21
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What is the difference between 127.0.0.1 and localhost
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Well, by IP is faster.
Basically, when you call by server name, it is converted to original IP.
But it would be difficult to memorize an IP, for this reason the domain name was created.
Personally I use http://localhost instead of http://127.0.0.1 or http://username.
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How to generate random number with the specific length in python
...is quicker than alternatives. Just add the neccessary preceding zeros when converting to a string.
import random
num = random.randrange(1, 10**3)
# using format
num_with_zeros = '{:03}'.format(num)
# using string's zfill
num_with_zeros = str(num).zfill(3)
Alternatively if you don't want to save t...
SQL - HAVING vs. WHERE
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it's not a good example as you could convert : ` WHERE companyId = 884501253109 GROUP BY country, city HAVING country = 'MX' ` to: ` WHERE companyId = 884501253109, country = 'MX' GROUP BY city `
– Etienne Herlaut
Nov 8 '...