Lists and Dictionaries | Python Fiddle

"""
LISTS
"""

mylist = ["cat","dog","snake","rat"]
print len(mylist)
print mylist

mylist[3] = "guinea pig" #replace 4th animal in list
print mylist

mylist.append("rat") #bring the rat back!
print mylist

top3 = mylist[0:3] #save first 3 in list; NOTE: DOES NOT INCLUDE LAST INDEX VALUE; only selects 0,1,2
print top3

bottom = mylist[3:] #the remaining losers
print bottom

print mylist.index("snake") #where is the snake on this list?

#list functions
print " ".join(mylist) #creates one string joined up with " "

for animal in mylist:
    print animal + " " + str(mylist.index(animal)) #print animal name ands its index within the list
    
x1 = [1,2,3]
x2 = [a*2 for a in x1]
print x1, x2
    
mylist.sort() #sorts alphanumerically
print mylist

mylist.remove("rat") #rat was eaten by snake... (removes item if found; do NOT input index)
print mylist

print mylist.pop(0) #.pop() will remove item at given index, and return it
print mylist

del(mylist[0]) #like .remove(), but deletes at inputed index, doesn't hunt down actual list item like .remove() does
print mylist

"""
DICTIONARIES
"""

mydic = {"San Jose" : 408, "SLO" : 805, "NYC" : 212}
print mydic["San Jose"]

mydic["SF"] = 415
del mydic["NYC"]
print mydic

"""
Inventory Example
"""
inventory = {
    'gold' : 500,
    'pouch' : ['flint', 'twine', 'gemstone'],
    'backpack' : ['xylophone','dagger', 'bedroll','bread loaf']
}

# Adding a key 'burlap bag' and assigning a list to it
inventory['burlap bag'] = ['apple', 'small ruby', 'three-toed sloth']

# Sorting the list found under the key 'pouch'
inventory['pouch'].sort()

# Do stuff
inventory['pocket'] = ['seashell','strange berry','lint']
inventory['backpack'].sort()
inventory['backpack'].remove('dagger')
inventory['gold'] += 50

print inventory

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