Python
What is the effect of using pip to install python packages on anaconda?
I have installed a fresh anaconda v4.4. I realized that python packages can be installed using both conda and pip. What is the effect of using pip to install python packages instead of conda when using anaconda? Will the pip-installed libraries cease to function? I am using python v3
NumPy: calculate averages with NaNs removed
How can I calculate matrix mean values along a matrix, but to remove nan values from calculation? (For R people, think na.rm = TRUE).
Safest way to convert float to integer in python?
Python’s math module contain handy functions like floor & ceil. These functions take a floating point number and return the nearest integer below or above it. However these functions return the answer as a floating point number. For example:
Python – When to use file vs open
What’s the difference between file and open in Python? When should I use which one? (Say I’m in 2.5)
multiprocessing.Pool – PicklingError: Can’t pickle : attribute lookup thread.lock failed
multiprocessing.Pool is driving me crazy…
I want to upgrade many packages, and for every one of them I have to check whether there is a greater version or not. This is done by the check_one function.
The main code is in the Updater.update method: there I create the Pool object and call the map() method.
How to return a subset of a list that matches a condition
Let’s say I have a list of ints: listOfNumbers = range(100) And I want to return a list of the elements that meet a certain condition, say: def meetsCondition(element): return bool(element != 0 and element % 7 == 0) What’s a Pythonic way to return a sub-list of element in a list for which meetsCondition(element) … Read more
Sort list by frequency
Is there any way in Python, wherein I can sort a list by its frequency?
Length of generator output
Python provides a nice method for getting length of an eager iterable, len(x) that is. But I couldn’t find anything similar for lazy iterables represented by generator comprehensions and functions. Of course, it is not hard to write something like: def iterlen(x): n = 0 try: while True: next(x) n += 1 except StopIteration: pass … Read more
Multiple variables in SciPy’s optimize.minimize
According to the SciPy documentation it is possible to minimize functions with multiple variables, yet it doesn’t tell how to optimize on such functions.