I have attached a patch that addresses the following:
plot accepts the linestyles arguments '-','--','-.',':' [+ some more]
and the Collection class accepts the
linestyle arguments 'solid','dashed','dashdot','dotted'.
This patch allows to use both notations. A test script is attached too.
So its possible to use
plot(x,y, linestyle='--') # old (preferred) style
plot(x,y, linestyle='dashed') # now also possible
contour(Z, linestyles='dotted') # old style
contour(Z, linestyles=':') # now also possible
The latter case is probably more useful than the first, but both work.
Any comments ?