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How to drop a list of rows from Pandas dataframe?
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Use DataFrame.drop and pass it a Series of index labels:
In [65]: df
Out[65]:
one two
one 1 4
two 2 3
three 3 2
four 4 1
In [66]: df.drop(df.index[[1,3]])
Out[66]:
one two
one 1 4
three ...
The object cannot be deleted because it was not found in the ObjectStateManager
...ext, outside of a TransactionScope. Moved the parent call inside the scope and same context and my problem was solved.
– dan richardson
Feb 7 '13 at 10:31
1
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Running Python on Windows for Node.js dependencies
...'t find Python executable "python", you can set the PYTHON env variable.
And in your comment, you say you did this:
set PYTHONPATH=%PYTHONPATH%;C:\My_python_lib
That's nice, but that doesn't set the PYTHON variable, it sets the PYTHONPATH variable.
Meanwhile, just using the set command only ...
How to stage only part of a new file with git?
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Whoa, all that update-index and hash-object business seems overly complicated. How about this instead:
git add -N new_file
git add -i
From git help add:
-N, --intent-to-add
Record only the fact that the path will be added later. An entry
f...
Python decorators in classes
... Test()
test.bar()
This avoids the call to self to access the decorator and leaves it hidden in the class namespace as a regular method.
>>> import stackoverflow
>>> test = stackoverflow.Test()
>>> test.bar()
start magic
normal call
end magic
>>>
edited t...
How do I do a case-insensitive string comparison?
...hos”) has all three: uppercase at the front, lowercase final at the end, and lowercase nonfinal at the third position. If your two strings are Σίσυφος and ΣΊΣΥΦΟΣ, then your approach fails, because those are supposed to be the same case insensitively.
– tchrist...
Compare equality between two objects in NUnit
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Override .Equals for your object and in the unit test you can then simply do this:
Assert.AreEqual(LeftObject, RightObject);
Of course, this might mean you just move all the individual comparisons to the .Equals method, but it would allow you to reuse tha...
Why should I use the keyword “final” on a method parameter in Java?
I can't understand where the final keyword is really handy when it is used on method parameters.
12 Answers
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What tools are there for functional programming in C?
...ional programming in C ( not C++). Obviously, C is a procedural language and doesn't really support functional programming natively.
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Where do you store your salt strings?
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The point of rainbow tables is that they're created in advance and distributed en masse to save calculation time for others - it takes just as long to generate rainbow tables on the fly as it would to just crack the password+salt combination directly (since effectively what's being done ...