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Why does string::compare return an int?
...like short or char ? My understanding is that this method only returns -1, 0 or 1.
9 Answers
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How to replace plain URLs with links?
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+100
First off, rolling your own regexp to parse URLs is a terrible idea. You must imagine this is a common enough problem that someone h...
Is there a Subversion command to reset the working copy?
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180
You can recursively revert like this:
svn revert --recursive .
There is no way (without writ...
Difference between >>> and >>
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421
>> is arithmetic shift right, >>> is logical shift right.
In an arithmetic shift...
How to open, read, and write from serial port in C?
... serial device converter driver. When I plug it in, it creates: /dev/ttyUSB1.
2 Answers
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Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
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184
When you do len(df['column name']) you are just getting one number, namely the number of rows ...
How do I convert a pandas Series or index to a Numpy array? [duplicate]
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To get a NumPy array, you should use the values attribute:
In [1]: df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]}, index=['a', 'b', 'c']); df
A B
a 1 4
b 2 5
c 3 6
In [2]: df.index.values
Out[2]: array(['a', 'b', 'c'], dtype=object)
This accesses how the data is already ...
What should main() return in C and C++?
...() — and why? And how about the arguments?
If int main() then return 1 or return 0 ?
17 Answers
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Get the first element of each tuple in a list in Python [duplicate]
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196
Use a list comprehension:
res_list = [x[0] for x in rows]
Below is a demonstration:
>&g...
Why does this Java program terminate despite that apparently it shouldn't (and didn't)?
...ron microscope went over its boundary, and after a chain of events I lost $12 million of equipment. I've narrowed down over 40K lines in the faulty module to this:
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