perl questions

perl answers

• Background shape of plot based on variable
• Faster (vectorized) way to do this pandas formula with dates
• How to concatenate many vectors in one matrix (each vector is a column of the new matrix)
• Insert Python Dataframes into MySQL
• Parse xml with sub-nodes and create a Pandas dataframe
• Cosine distance more than 1
• How to split dictionary into columns when contains None
• Program calculating tax rate per line item equaling into VAT
• How to calculate weighted mean using group_by function in Pandas
• pandas using plot to draw a line graph, the time is not continuous, how to make the line continuous？