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Obfuscated C Code Contest 2006. Please explain sykes2.c
...2 (a space) or character 33 (a !). The first table (">'txiZ^(~z?") is a set of 10 bitmaps describing the appearance of each character, and the second table (";;;====~$::199") selects the appropriate bit to display from the bitmap.
The second table
Let's start by examining the second table, int ...
Pandas selecting by label sometimes return Series, sometimes returns DataFrame
...
If the objective is to get a subset of the data set using the index, it is best to avoid using loc or iloc. Instead you should use syntax similar to this :
df = pd.DataFrame(data=range(5), index=[1, 2, 3, 3, 3])
result = df[df.index == 3]
isinstance(resu...
Currency formatting in Python
...ncy (and date) formatting.
>>> import locale
>>> locale.setlocale( locale.LC_ALL, '' )
'English_United States.1252'
>>> locale.currency( 188518982.18 )
'$188518982.18'
>>> locale.currency( 188518982.18, grouping=True )
'$188,518,982.18'
...
Find and copy files
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Listing only directories using ls in Bash?
...ers. To include them, either specify them explicitly like ls -d .*/ */, or set the dotglob option in Bash.
– Gergő
Jan 11 '15 at 15:15
1
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Why does Popen.communicate() return b'hi\n' instead of 'hi'?
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Center content of UIScrollView when smaller
... UIView *subView = [scrollView.subviews objectAtIndex:0];
CGFloat offsetX = MAX((scrollView.bounds.size.width - scrollView.contentSize.width) * 0.5, 0.0);
CGFloat offsetY = MAX((scrollView.bounds.size.height - scrollView.contentSize.height) * 0.5, 0.0);
subView.center = CGPointMake(sc...
Why do we use arrays instead of other data structures?
...he address to that mailbox.
In C, an array is simply a pointer with an offset, the offset specifies how far in memory to look. This provides O(1) access time.
MyArray [5]
^ ^
Pointer Offset
All other data structures either build upon this, or do not use adjacent memory for sto...
git: Switch branch and ignore any changes without committing
...it branch and was ready to commit my changes, so I made a commit with a useful commit message. I then absentmindedly made minor changes to the code that are not worth keeping. I now want to change branches, but git gives me,
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How to randomly select rows in SQL?
...re each row gets a random number, and then a large unindexed random number set is sorted?
– Andrey
Apr 19 '14 at 16:04
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