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Elegant Python function to convert CamelCase to snake_case?
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Personally I am not sure how anything using regular expressions in python can be described as elegant. Most answers here are just doing "code golf" type RE tricks. Elegant coding is supposed to be easily understood.
def to_snake_case(not_snake_case):
final = ''
for i in xrange(len(n...
Split views.py in several files
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In Django everything is a Python module (*.py). You can create a view folder with an __init__.py inside and you still will be able to import your views, because this also implements a Python module. But an example would be better.
Your original views...
Convert DataFrame column type from string to datetime, dd/mm/yyyy format
...tetime(df['date_col'], format='%d/%m/%Y')
More details on format here:
Python 2 https://docs.python.org/2/library/datetime.html#strftime-strptime-behavior
Python 3 https://docs.python.org/3.7/library/datetime.html#strftime-strptime-behavior
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Max retries exceeded with URL in requests
...cause the target machine actively refused it".
There is an issue at about python.requests lib at Github, check it out here
To overcome this issue (not so much an issue as it is misleading debug trace) you should catch connection related exceptions like so:
try:
page1 = requests.get(ap)
except...
How do I find the duplicates in a list and create another list with them?
How can I find the duplicates in a Python list and create another list of the duplicates? The list only contains integers.
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Python: fastest way to create a list of n lists
... is about 15 % faster on my machine.
Edit: Using NumPy, you can avoid the Python loop using
d = numpy.empty((n, 0)).tolist()
but this is actually 2.5 times slower than the list comprehension.
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How to make a class property? [duplicate]
In python I can add a method to a class with the @classmethod decorator. Is there a similar decorator to add a property to a class? I can better show what I'm talking about.
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Filtering a list of strings based on contents
... 'ab' in them. I.e. the result is ['ab','abc'] . How can this be done in Python?
5 Answers
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Viewing all defined variables [duplicate]
I'm currently working on a computation in python shell. What I want to have is Matlab style listout where you can see all the variables that have been defined up to a point (so I know which names I've used, their values and such).
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Cosine Similarity between 2 Number Lists
...th vectors (more of a matrix transpose, actually) just to get the data in "Pythonic" order. It would be interesting to time the nuts-and-bolts implementation:
import math
def cosine_similarity(v1,v2):
"compute cosine similarity of v1 to v2: (v1 dot v2)/{||v1||*||v2||)"
sumxx, sumxy, sumyy ...