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CDJB has asked 2 questions and find answers to 40 problems.

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CDJB questions

Finding the average of the x component of an array of coordinates, based on the y component
Vectorised method to append dataframe rows to columns and vice-versa

CDJB answers

How to get dictionary keys and values if both keys are in two separated dictionaries?
Flattening a list of lists, replacing empty sublists with a certain value
Sum values inside a list of tuples and order by weekday [duplicate]
How can I apply a permutation to a list?
How to determine the size of a set variable in Python?
How to get pixel rgb values using matplotlib?
Find index of first element not equal to a specific value
pandas.DataFrame.copy(deep=True) doesn't actually create deep copy [duplicate]
How to check if a list of floats adds up to a whole number?
Mutagen's save() does not set or change cover art for MP3 files