daily stock to weekly stock values

SO_34598339.ipynb

Now (pandas 1.0.5) we don't even need to define the take_first and take_last functions. 'first' and 'last' would work fine.

output = df.resample('W')                                 # Weekly resample
                    .agg({'Open': 'first', 
                          'High': 'max',
                          'Low': 'min',
                          'Close': 'last',
                          'Volume': 'sum'}) 
output.index = output.index + pd.DateOffset(days=-6)  # to put the labels to Monday