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Reading a huge .csv file
...iency when using this technique with csv.DictReader? Because my tests on a 2.5GB .csv file show that trying to iterate row by row like this when using that instead of csv.reader causes the Python process to grow to the full 2.5GB memory usage.
– user5359531
Jul...
Making heatmap from pandas DataFrame
...: [0, 1] -> [-0.5, 0.5, 1.5]
Example 2: [0, 1, 4] -> [-0.5, 0.5, 2.5, 5.5]
Example 3: [4, 1, 0] -> [5.5, 2.5, 0.5, -0.5]"""
assert index.is_monotonic_increasing or index.is_monotonic_decreasing
# the beginning and end values are guessed from first and last two
start = i...
Why does .NET use banker's rounding as default?
...
Use another overload of Round function like this:
decimal.Round(2.5m, 0,MidpointRounding.AwayFromZero)
It will output 3. And if you use
decimal.Round(2.5m, 0,MidpointRounding.ToEven)
you will get banker's rounding.
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Ruby, remove last N characters from a string?
...
Ruby 2.5+
As of Ruby 2.5 you can use delete_suffix or delete_suffix! to achieve this in a fast and readable manner.
The docs on the methods are here.
If you know what the suffix is, this is idiomatic (and I'd argue, even more r...
How do you round a floating point number in Perl?
...te that they use the Round half to even method.
foreach my $i ( 0.5, 1.5, 2.5, 3.5 ) {
printf "$i -> %.0f\n", $i;
}
__END__
0.5 -> 0
1.5 -> 2
2.5 -> 2
3.5 -> 4
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Formatting floats without trailing zeros
...oping of the microbenchmark to accurately model real code) have format(v, '2.5f') take ~10% longer than '{:2.5f}'.format(v). Even if it didn't, I tend to use the str method form because when I need to tweak it, add additional values to it, etc., there is less to change. Of course, as of 3.6 we have ...
Tab key == 4 spaces and auto-indent after curly braces in Vim
... has been replaced by cindent which "Works more cleverly", although still mainly for languages with C-like syntax:
:help C-indenting
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How do I return to an older version of our code in Subversion?
...end up with a working copy looking like the old version) and then commit again. So for example to go from revision 150 (current) back to revision 140:
svn update
svn merge -r 150:140 .
svn commit -m "Rolled back to r140"
The Subversion Red Book has a good section about this.
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In-memory size of a Python structure
...anks, and sorry for the dupe for the second question... too bad I am using 2.5 and not 2.6...
– LeMiz
Aug 25 '09 at 23:16
...
Catch multiple exceptions in one line (except block)
...igns the error with a comma. This usage, the only form available in Python 2.5 and earlier, is deprecated, and if you wish your code to be forward compatible in Python 3, you should update the syntax to use the new form:
import sys
try:
mainstuff()
except (KeyboardInterrupt, EOFError), err: # ...