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Pandas DataFrame Groupby two columns and get counts
...e your second question:
In [56]: df.groupby(['col5','col2']).size().reset_index().groupby('col2')[[0]].max()
Out[56]:
0
col2
A 3
B 2
C 1
D 3
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Git add all files modified, deleted, and untracked?
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here is the problem i am facing - stackoverflow.com/q/7726131/636762 - kindly help me on this one please
– Rakib
Oct 11 '11 at 12:41
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How to fully delete a git repository created with init?
...ow you can delete the directory (either with Windows Explorer or rmdir /S /Q)
Set back the Status Cache from None to Default and you should be fine again...
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How do I compare two string variables in an 'if' statement in Bash? [duplicate]
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For string equality comparison, use:
if [[ "$s1" == "$s2" ]]
For string does NOT equal comparison, use:
if [[ "$s1" != "$s2" ]]
For the a contains b, use:
if [[ $s1 == *"$s2"* ]]
(and make sure to add spaces between the symbols)...
How do you clear a stringstream variable?
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For all the standard library types the member function empty() is a query, not a command, i.e. it means "are you empty?" not "please throw away your contents".
The clear() member function is inherited from ios and is used to clear the error state of the stream, e.g. if a file stream has the ...
Remove all whitespace in a string
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The question specifically asks for removing all of the whitespace and not just at the ends. Please take notice.
– Shayan Shafiq
Mar 4 at 11:38
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Find size of an array in Perl
...dard way to get an array's size.
The second way actually returns the last index of the array, which is not (usually) the same as the array size.
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What are the benefits of Java's types erasure?
...ing. This is not to say that testing is intrinsically a bad idea, but the quoted Twitter user is suggesting that there is a much better way.
So our goal is to have correct programs that we can reason about clearly and rigorously in a way that corresponds with how the machine will actually execute t...
How to convert SQL Query result to PANDAS Data Structure?
... way to do it, as you don't need to manually use .keys() to get the column index. Probably Daniel's answer was written before this method existed. You can also use pandas.io.sql.read_frame()
– RobinL
Oct 13 '13 at 13:54
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How to find a hash key containing a matching value
....9 and greater:
hash.key(value) => key
Ruby 1.8:
You could use hash.index
hsh.index(value) => key
Returns the key for a given value. If
not found, returns nil.
h = { "a" => 100, "b" => 200 }
h.index(200) #=> "b"
h.index(999) #=> nil
So to get "oran...