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cartesian product in pandas
...rom pandas import DataFrame, merge
df1 = DataFrame({'key':[1,1], 'col1':[1,2],'col2':[3,4]})
df2 = DataFrame({'key':[1,1], 'col3':[5,6]})
merge(df1, df2,on='key')[['col1', 'col2', 'col3']]
Output:
col1 col2 col3
0 1 3 5
1 1 3 6
2 2 4 5
3 2 4 6...
Use rvmrc or ruby-version file to set a project gemset with RVM?
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372
If your .rvmrc file contains custom shell code, continue using .rvmrc as it allows you to includ...
What exactly do “u” and “r” string flags do, and what are raw string literals?
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702
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Is there a reason that we cannot iterate on “reverse Range” in ruby?
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CALayer with transparent hole in it
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219
I was able to solve this with Jon Steinmetz suggestion. If any one cares, here's the final sol...
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Round to 5 (or other number) in Python
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312
I don't know of a standard function in Python, but this works for me:
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def myround(x, ...
Programmer Puzzle: Encoding a chess board state throughout a game
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surface plots in matplotlib
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122
For surfaces it's a bit different than a list of 3-tuples, you should pass in a grid for the do...