how to unstack (or pivot?) in pandas?

I have a dataframe that looks like the following: import pandas as pd datelisttemp = pd.date_range('1/1/2014', peri...

More effective way to use pandas get_loc??

Task: Search a multi column dataframe for a value (all values are unique) and return the index of that row. Curren...

Can I access ImageMagick API with Python??

I need to use ImageMagick as PIL does not have the amount of image functionality available that I am looking for. Ho...

Repeat function python?

I'm stuck at higher-order functions in python. I need to write a repeat function repeat that applies the function f ...

Automatically create requirements.txt?

Sometimes I download the python source code from github and don't know how to install all the dependencies. If there...

How do I use a TimeSeriesSplit with a GridSearchCV object to tune a model in scikit-learn??

I've searched the sklearn docs for TimeSeriesSplit and the docs for cross-validation but I haven't been able to fin...

How to ignore certificate in python 2.6??

In Python 2.7, I can do the below and it works: ctx = ssl.create_default_context() // function does not exist in py...

Why is numpy.linalg.pinv() preferred over numpy.linalg.inv() for creating inverse of a matrix in linear regression?

If we want to search for the optimal parameters theta for a linear regression model by using the normal equation wit...

What are the differences between type() and isinstance()??

What are the differences between these two code fragments? Using type(): import types if type(a) is types.DictT...

Prepend element to numpy array?

I have the following numpy array import numpy as np X = np.array([[5.], [4.], [3.], [2.], [1.]]) I want to inser...

Can random.uniform(0,1) ever generate 0 or 1??

In the documentation it is said that there is a chance that uniform(0,1) can generate the values 0 and 1. I have r...

Pythonic way to create union of all values contained in multiple lists?

I have a list of lists: lists = [[1,4,3,2,4], [4,5]] I want to flatten this list and remove all duplicates; or, i...

In python, what is the difference between random.uniform() and random.random()??

In python for the random module, what is the difference between random.uniform() and random.random()? They both gene...

What's the difference between %s and %d in Python string formatting??

I don't understand what %s and %d do and how they work. ...