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What's the difference between parenthesis $() and curly bracket ${} syntax in Makefile?
Is there any differences in invoking variables with syntax ${var} and $(var) ? For instance, in the way the variable will be expanded or anything?
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Convert string to Python class object?
Given a string as user input to a Python function, I'd like to get a class object out of it if there's a class with that name in the currently defined namespace. Essentially, I want the implementation for a function which will produce this kind of result:
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How to escape os.system() calls?
... or any other kind of nasty shell metacharacter.
Update: If you are using Python 3.3 or later, use shlex.quote instead of rolling your own.
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Finding median of list in Python
How do you find the median of a list in Python? The list can be of any size and the numbers are not guaranteed to be in any particular order.
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How do I raise the same Exception with a custom message in Python?
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Update: For Python 3, check Ben's answer
To attach a message to the current exception and re-raise it:
(the outer try/except is just to show the effect)
For python 2.x where x>=6:
try:
try:
raise ValueError # something...
How to differentiate between time to live and time to idle in ehcache
...we always want to set idletime < ttl
– Jacques René Mesrine
Apr 21 '10 at 3:41
In the comment above when you say t...
Test if executable exists in Python?
In Python, is there a portable and simple way to test if an executable program exists?
21 Answers
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Counting the number of True Booleans in a Python List
...th the constant True, a simple sum is fine. However, keep in mind that in Python other values evaluate as True as well. A more robust solution would be to use the bool builtin:
>>> l = [1, 2, True, False]
>>> sum(bool(x) for x in l)
3
UPDATE: Here's another similarly robust so...
Making a request to a RESTful API using python
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@ParveenShukhala "Requests officially supports Python 2.6–2.7 & 3.3–3.5, and runs great on PyPy." -- pypi.python.org/pypi/requests
– danio
Dec 15 '16 at 9:10
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How to sum all the values in a dictionary?
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Well,Python 2.7.12 also works well with sum(d.values())
– LancelotHolmes
Jan 17 '17 at 1:14
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