jottbe questions

jottbe answers

• Merging two Pandas DataFrames with many sparse columns results in a DataFrame that requires a disproportionate large amount of memory
• Pandas transform inconsistent behavior for list
• Why doesn't "is not None" work with dataframe.loc, but "!= None" works fine?
• Set an environment variable (password) in a way its value is not saved to the bash history
• How can I align pandas get_dummies across training / validation / testing?
• Python Pandas read csv file with variable preamble length
• Derivative of neural network with respect to input
• How to create random samples without replacement of a population in a fast way?
• See if the values in a column contain % in a pandas dataframe
• comb: any value above 40 returns infinity? not sure why