Fix four small issues in Python lectures (#862) - #863

Fix four small issues in Python lectures (#862)#863

nishantmishraa wants to merge 1 commit into

QuantEcon:mainQuantEcon/lecture-python-intro:mainfrom

nishantmishraa:fix-issue-862nishantmishraa/lecture-python-intro:fix-issue-862Copy head branch name to clipboard