chpt5practice.py

#Chapter 5 practice
# Linhe Sun

# practice 5-1
car = 'subaru'
print("Is car == 'subaru'? I predict True.")
print(car == 'subaru')
print("Is car == 'audi'? I predict False.")
print(car == 'audi')
print("Is car != 'subaru'? I predict False.")
print(car != 'subaru')
print("Is car != 'audi'? I predict True.")
print(car != 'audi')

cars = ['audi', 'subaru']
print("\nIs 'BMW' in cars? I predict False.")
print('BMW' in cars)
print("Is 'audi' in cars? I predict True.")
print('audi' in cars)
print("Is 'BMW' not in cars? I predict True.")
print('BMW' not in cars)
print("Is 'audi' not in cars? I predict False.")
print('audi' not in cars)

num = 18
print("\nIs 20 bigger than num? I predict True.")
print(20 > num)
print("Is 16 bigger than num? I predict False.")
print(16 > num)

# practice 5-2
car = 'Subaru'
print("Is car == 'Subaru'? I predict True.")
print(car == 'Subaru')
print("Is car == 'Audi'? I predict False.")
print(car == 'Audi')

print("\nIs car == 'subaru'? I predict True.")
print(car.lower() == 'subaru')
print("Is car == 'audi'? I predict False.")
print(car.lower == 'audi')

num = 18
print("\nIs 18 equal num? I predict True.")
print(18 == num)
print("Is 18 un-equal num? I predict False.")
print(18 != num)
print("Is 20 bigger than num? I predict True.")
print(20 > num)
print("Is 16 bigger than num? I predict False.")
print(16 < num)
print("Is 20 >= num? I predict True.")
print(20 >= num)
print("Is 18 <= num? I predict True.")
print(18 <= num)

print("\nIs 18 equal to num & 20 bigger than num? I predict True")
print(18 == num and 20 > num)
print("Is 18 equal to num & 20 less than num? I predict False")
print(18 == num and 20 < num)
print("Is 18 equal to num or 20 bigger than num? I predict True")
print(18 == num or 20 > num)
print("Is 18 equal to num or 20 less than num? I predict True")
print(18 == num or 20 < num)

cars = ['audi', 'subaru']
print("\nIs 'BMW' in cars? I predict False.")
print('BMW' in cars)
print("Is 'audi' in cars? I predict True.")
print('audi' in cars)
print("Is 'BMW' not in cars? I predict True.")
print('BMW' not in cars)
print("Is 'audi' not in cars? I predict False.")
print('audi' not in cars)

# practice 5-3
alien_colors = ['green', 'yellow', 'red']
for alien_color in alien_colors:
    if alien_color == 'green':
        print("You got 5 points!")


# practice 5-4
for alien_color in alien_colors: 
    if alien_color == 'green':
        print("You got 5 points!")
    else:
        print("You got 10 points!")
    
# practice 5-5
for alien_color in alien_colors: 
    if alien_color == 'green':
        print("You got 5 points!")
    elif alien_color == 'yellow':
        print("You got 10 points!")
    else:
        print("You got 15 points!")

# practice 5-6
ages = [1, 3, 5, 14, 25, 67]
for age in ages:
    if age < 2:
        print("He/She is an infant.")
    elif age < 4:
        print("He/She is starting to walk.")
    elif age < 13:
        print("He/She is a child.")
    elif age < 20:
        print("He/She is a teenager.")
    elif age < 65:
        print("He/She is an adult.")
    else:
        print("He/She is old.")

# practice 5-7
fruits = ['banana', 'apple', 'peach']
if 'banana' in fruits:
    print("You really like bananas!")
if 'watermelon' in fruits:
    print("You really like watermelons!")
if 'peach' in fruits:
    print("You really like peaches!")
if 'apple' in fruits:
    print("You really like apples!")
if 'pear' in fruits:
    print("You really like pears!")

# practice 5-8
usrs = ['admin', 'Jiaxin', 'Hanlin', 'Xueqing', 'Linman']
for usr in usrs:
    if usr == 'admin':
        print("Hello admin, would you like to see a status report?")
    else:
        print("Hello " + usr + ", thank you for logging in again.")

# practice 5-9
usrs = []
if usrs:
    for usr in usrs:
        if usr == 'admin':
            print("Hello admin, would you like to see a status report?")
        else:
            print("Hello " + usr + ", thank you for logging in again.")
else:
    print("We need to find some users!")
    
#practice 5-10
current_users = ['admin', 'Jiaxin', 'Hanlin', 'Xueqing', 'Linman']
current_users_lower = [current_user.lower() for current_user in current_users]
new_users = ['Yulin', 'Qiaoxian', 'Hanlin', 'Linman', 'Xiaobin']
for new_user in new_users:
    if new_user.lower() in current_users_lower:
        print("You need to use another user name.")
    else:
        print("This name has not been taken.")

# practice 5-11
nums = list(range(1,10))
for num in nums:
    print(num)
for num in nums:
    if num == 1:
        print(str(num) + "st")
    elif num == 2:
        print(str(num) + "nd")
    elif num == 3:
        print(str(num) + "rd")
    else:
        print(str(num) + "th")
        
# practice 5-12
# I think they are all OK.

# practice 5-13
# I have more interests in data mining.