Don't use today() for default arguments

[jdemeyer]

The file src/sage/finance/stock.py contains this line

def history(self,startdate='Jan+1,+1900',enddate=date.today().strftime("%b+%d,+%Y"), histperiod='daily'):

The causes today's date to be hard-coded in the argspec and in the __doc__, which makes little sense. It is better to use None as default argument and then change None to today in the function body.

Note that doctests don't pass neither with or without this branch.

Component: finance

Author: Jeroen Demeyer

Branch/Commit: d81fbbd

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/20501

[jdemeyer]

Author: Jeroen Demeyer

[jdemeyer]

Branch: u/jdemeyer/don_t_use_today___for_default_arguments

[jdemeyer]

New commits:

d81fbbd

Don't use today() for default arguments

[jdemeyer]

Commit: d81fbbd

[tscrim]

Reviewer: Travis Scrimshaw

[vbraun]

Changed branch from u/jdemeyer/don_t_use_today___for_default_arguments to d81fbbd