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Difference between wait and sleep
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wait waits for a process to finish; sleep sleeps for a certain amount of seconds.
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How do I enable C++11 in gcc?
I use gcc 4.8.1 from http://hpc.sourceforge.net on Mac OSX Mountain Lion. I am trying to compile a C++ program which uses the to_string function in <string> . I need to use the flag -std=c++11 every time:
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How to prevent XSS with HTML/PHP?
...nt to output something to the browser that came from the user input.
The correct way to use this function is something like this:
echo htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
Google Code University also has these very educational videos on Web Security:
How To Break Web Software - A l...
How to trace the path in a Breadth-First Search?
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You should have look at http://en.wikipedia.org/wiki/Breadth-first_search first.
Below is a quick implementation, in which I used a list of list to represent the queue of paths.
# graph is in adjacent list representation
graph = {
'1': ['2', '3', '4'],
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Convert a String representation of a Dictionary to a dictionary?
... in Python 2.6 you can use the built-in ast.literal_eval:
>>> import ast
>>> ast.literal_eval("{'muffin' : 'lolz', 'foo' : 'kitty'}")
{'muffin': 'lolz', 'foo': 'kitty'}
This is safer than using eval. As its own docs say:
>>> help(ast.literal_eval)
Help on function li...
How to read a .xlsx file using the pandas Library in iPython?
I want to read a .xlsx file using the Pandas Library of python and port the data to a postgreSQL table.
6 Answers
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Why is NaN not equal to NaN? [duplicate]
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The accepted answer is 100% without question WRONG. Not halfway wrong or even slightly wrong. I fear this issue is going to confuse and mislead programmers for a long time to come when this question pops up in searches.
NaN is designed to propagate through all calculations, infecting them like...
Check OS version in Swift?
I'm trying to check system information in Swift. I figured out, that it could be achieved by code:
19 Answers
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Check whether variable is number or string in JavaScript
Does anyone know how can I check whether a variable is a number or a string in JavaScript?
32 Answers
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How to check whether a pandas DataFrame is empty?
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You can use the attribute df.empty to check whether it's empty or not:
if df.empty:
print('DataFrame is empty!')
Source: Pandas Documentation
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