《Python编程-从入门到实践》课后习题（5）

5-3

#Ver.1:
alien_color = 'red'
if alien_color == 'green':
    print('You get 5 points')

#Ver.2:
alien_color = 'green'
if alien_color == 'green':
    print('You get 5 points')

5-4

#Ver.1:
alien_color = 'red'
if alien_color == 'green':
    print('You get 5 points')
if alien_color != 'green':
    print('You got 10 points')

#Ver.2:
alien_color = 'red'
if alien_color == 'green':
    print('You get 5 points')
else:
    print('You got 10 points')

5-5

#Ver.1:
alien_color = 'green'
if alien_color == 'green':
    print('You get 5 points')
elif alien_color == 'yellow':
    print('You get 10 points')
elif alien_color == 'red':
    print('You get 15 points')
#Ver.2:
alien_color = 'yellow'
if alien_color == 'green':
    print('You get 5 points')
elif alien_color == 'yellow':
    print('You get 10 points')
elif alien_color == 'red':
    print('You get 15 points')
#Ver.3:
alien_color = 'red'
if alien_color == 'green':
    print('You get 5 points')
elif alien_color == 'yellow':
    print('You get 10 points')
elif alien_color == 'red':
    print('You get 15 points')

5-6

age = 17
if age < 2:
    print("He's a baby")
elif age >= 2 and age < 4:
    print("He's learning to walk")
elif age >=4 and age < 13:
    print("He's a child")
elif age >= 13 and age < 20:
    print("He's a youth")
elif age >= 20 and age <65:
    print("He's a grown-up")
else:
    print("He's a old man")

5-7

favorate_fruits = ['apple', 'orange', 'grape']
if 'banana' in favorate_fruits:
    print("Banana is my favorate fruit")
if 'apple' in favorate_fruits:
    print("Apple is my favorate fruit")
if 'lemon' in favorate_fruits:
    print("Lemon is my favorate fruit")
if 'grape' in favorate_fruits:
    print("Grape is my favorate fruit")
if 'orange' in favorate_fruits:
    print("Orange is my favorate fruit")
if 'pear' in favorate_fruits:
    print("Pear is my favorate fruit")

5-8

users = ['admin', 'Bob', 'Cathy', 'David', 'Eric']
for user in users:
    if user == 'admin':
        print("Hello admin, would you like to see a status report?")
    else:
        print("Hello " + user + ", thank you for logging in again")

5-9

users = ['admin', 'Bob', 'Cathy', 'David', 'Eric']
users.clear()
if users:
    for user in users:
        if user == 'admin':
            print("Hello admin, would you like to see a status report?")
        else:
            print("Hello " + user + ", thank you for logging in again")
else:
    print("We need to find some users")

5-10

current_users = ['Ann', 'Bob', 'Cathy', 'David', 'Eric']
new_users = ['Frank', 'Gary', 'Henry', 'bob', 'Eric' ]
for new_user in new_users:
    name = new_user.lower().title()
    if name in current_users:
        print("The name:" + new_user + " has been used. Input again")

5-11

nums = range(1, 10)
for num in nums:
    if num == 1:
        print('1st')
    elif num == 2:
        print('2nd')
    elif num == 3:
        print('3rd')
    else:
        print(str(num) + 'st')