busdaycalendar([weekmask, holidays]) | 
A business day calendar object that efficiently stores information defining valid days for the busday family of functions. | 
is_busday(dates[, weekmask, holidays, …]) | 
Calculates which of the given dates are valid days, and which are not. | 
busday_offset(dates, offsets[, roll, …]) | 
First adjusts the date to fall on a valid day according to the roll rule, then applies offsets to the given dates counted in valid days. | 
busday_count(begindates, enddates[, …]) | 
Counts the number of valid days between begindates and enddates, not including the day of enddates. |