how to make python dictionary with for loop code example

Example 1: python iterate through dictionary

a_dict = {'apple':'red', 'grass':'green', 'sky':'blue'}
for key in a_dict:
  print key # for the keys
  print a_dict[key] # for the values

Example 2: python generate dictionary in loop

n = int(input())
ans = {i : i*i for i in range(1,n+1)}
print(ans)