What worked for me was adding this (as per: How to set the line width of error bar caps, in matplotlib):
(_, caps, _) = plt.errorbar(x,y, yerr=err, capsize=20, elinewidth=3)
for cap in caps:
cap.set_color('red')
cap.set_markeredgewidth(10)
What worked for me was adding this (as per: How to set the line width of error bar caps, in matplotlib):
(_, caps, _) = plt.errorbar(x,y, yerr=err, capsize=20, elinewidth=3)
for cap in caps:
cap.set_color('red')
cap.set_markeredgewidth(10)