Nicely done! Do you remember how we used the in/not in operators with lists? They work exactly the same with dictionaries! The in and not in operators check if the given key is present in the dictionary. Take a look:
# define a dictionary
# check if Shakira is there
if 'Shakira' in phonebook:
print('Yay, we have Shakira\'s number!')
else:
print('Shakira not found :(')
Ask the user to provide an integer: Enter a year between 2000 and 2018 to check if there was a major Windows release.
If there is an item for the given year in os_releases, print: A major version found: {os_release}.
Otherwise, print: No major version found.
In the conditional statement, use:
if user_input in os_releases:
