# Storing related pieces of information
# With what we know: requires multiple variables

facebook_friend1 = "Kelly"
facebook_friend2 = "John"
facebook_friend3 = "Nhat"

# Problems?
#   cumbersome
#   adding a new friend
#   repeating a task for all friends

# Where this comes up
#   Data collection
#   Social network (lists of friends)

# Solution: LISTS
#   Container for multiple pieces of information
#   Way to access that info through a single variable

# list of strings
facebook_friends = ["Kelly", "John", "Nhat"]
# list of integers
blood_pressure = [50, 52, 55, 50]

#displaying elements
print(facebook_friends)
# selecting a specific element
print(facebook_friends[2])

# adding elements
facebook_friends.append("Tamim")
print(facebook_friends)

# sorting it
facebook_friends.sort()
print(facebook_friends)

facebook_friends.remove("Kelly")
print(facebook_friends)

facebook_friends[0] = "Vincent"
print(facebook_friends)

# Doing same thing for every element in a list
for friend in facebook_friends:
    print friend * 2