age =27# This is known as global scopeprint(age)defincrease_age(): age =30# This is known as local scopedefadd_4_to_age_incorrect(): age = age +4# This does not know about the age above# You can pass the variable to the nested function like so:defadd_4_to_age_correct(age): age = age +4# This WILL know about the age defined above# Calling the nested function:add_4_to_age_correct(age)# The defined age - 30 will be passed to the nested function