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What does 'super' do in Python?
...super is one thing that allows greater flexibility for users of the code.
Python 2 versus 3
This works in Python 2 and 3:
super(Child, self).__init__()
This only works in Python 3:
super().__init__()
It works with no arguments by moving up in the stack frame and getting the first argument to...
What is the meaning of erb?
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Same as ".rhtml", you can also rename ".rjs" extension to ".js.erb" or ".rxml" to ".xml.erb"
This format separates out content type from template engine which is "erb" in this case.
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improv...
What key shortcuts are to comment and uncomment code?
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I believe it is View -> Toolbars -> XML Editor if you are on an XML file, and then View -> Toolbars -> Text Editor if you are on a text file. If you set one, it seems to remember it for both (so you should only have to set one).
– u...
Fastest way to convert an iterator to a list
... @systempuntoout It runs entirely in C. The list comprehension is in python. Of course it runs faster.
– aaronasterling
Sep 24 '10 at 22:24
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Re-raise exception with a different type and message, preserving existing information
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Python 3 introduced exception chaining (as described in PEP 3134). This allows, when raising an exception, to cite an existing exception as the “cause”:
try:
frobnicate()
except KeyError as exc:
raise ValueError("...
What is __future__ in Python used for and how/when to use it, and how it works
__future__ frequently appears in Python modules. I do not understand what __future__ is for and how/when to use it even after reading the Python's __future__ doc .
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How to use MySQLdb with Python and Django in OSX 10.6?
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I had the same error and pip install MySQL-python solved it for me.
Alternate installs:
If you don't have pip, easy_install MySQL-python should work.
If your python is managed by a packaging system, you might have to use
that system (e.g. sudo apt-get install ...)
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Difference between “@id/” and “@+id/” in Android
...riginal question.
Well, it depends on the context, when you're using the XML attribute of android:id, then you're specifying a new id, and are instructing the parser (or call it the builder) to create a new entry in R.java, thus you have to include a + sign.
While in the other case, like android:...
Using an ORM or plain SQL? [closed]
...e been writing plain SQL, primarily for MySQL. Though I have used ORMs in python like SQLAlchemy , I didn't stick with them for long. Usually it was either the documentation or complexity (from my point of view) holding me back.
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How to load/edit/run/save text files (.py) into an IPython notebook cell?
I've recently moved over to using IPython notebooks as part of my workflow. However, I've not been successful in finding a way to import .py files into the individual cells of an open IPython notebook so that they can edited, run and then saved. Can this be done?
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