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Get loop count inside a Python FOR loop
In a Python for loop that iterates over a list we can write:
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When is del useful in python?
I can't really think of any reason why python needs the del keyword (and most languages seem to not have a similar keyword). For instance, rather than deleting a variable, one could just assign None to it. And when deleting from a dictionary, a del method could be added.
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How do you test that a Python function throws an exception?
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You can use Python's Built-in Exceptions to quickly test the assertion; using @Moe's answer above for example: self.assertRaises(TypeError, mymod.myfunc). You can find a full list of the Built-in Exceptions here: docs.python.org/3/librar...
Python: How do I make a subclass from a superclass?
In Python, how do you make a subclass from a superclass?
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What is the 'pythonic' equivalent to the 'fold' function from functional programming?
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The Pythonic way of summing an array is using sum. For other purposes, you can sometimes use some combination of reduce (from the functools module) and the operator module, e.g.:
def product(xs):
return reduce(operator.mul, ...
Python group by
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I'm working on a MapReduce program in python, just wondering is there any way to group by values in a list without dealing with dictionaries or external library such as pandas? If not, then how can I get rid of items and type in my result?
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How to make RatingBar to show five stars
...the number of stars in my Activity ( myBar.setNumStars(5) ) that loads the xml but there was no success with that option either.
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What's an appropriate HTTP status code to return by a REST API service for a validation failure?
... 31st, then you would return an HTTP 400. Ditto if you expect well-formed XML in an entity body and it fails to parse.
(1/2016): Over the last five years WebDAV's more specific HTTP 422 (Unprocessable Entity) has become a very reasonable alternative to HTTP 400. See for instance its use in JSON A...
What is the most pythonic way to check if an object is a number?
Given an arbitrary python object, what's the best way to determine whether it is a number? Here is is defined as acts like a number in certain circumstances .
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Any gotchas using unicode_literals in Python 2.6?
We've already gotten our code base running under Python 2.6. In order to prepare for Python 3.0, we've started adding:
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