PythonDataStructures.py

# 'ab' is short for 'a'ddress'b'ook
ab = {
    'Swaroop': 'swaroop@swaroopch.com',
    'Larry': 'larry@wall.org',
    'Matsumoto': 'matz@ruby-lang.org',
    'Spammer': 'spammer@hotmail.com'
}
print("Swaroop's address is", ab['Swaroop'])
# Deleting a key-value pair
del ab['Spammer']
print('\nThere are {} contacts in the address-book\n'.format(len(ab)))
for name, address in ab.items():
    print('Contact {} at {}'.format(name, address))
# Adding a key-value pair
ab['Guido'] = 'guido@python.org'
if 'Guido' in ab:
    print("\nGuido's address is", ab['Guido'])


shoplist = ['apple', 'mango', 'carrot', 'banana']
name = 'swaroop'
# Indexing or 'Subscription' operation #
print('Item 0 is', shoplist[0])
print('Item 1 is', shoplist[1])
print('Item 2 is', shoplist[2])
print('Item 3 is', shoplist[3])
print('Item -1 is', shoplist[-1])
print('Item -2 is', shoplist[-2])
print('Character 0 is', name[0])
# Slicing on a list #
print('Item 1 to 3 is', shoplist[1:3])
print('Item 2 to end is', shoplist[2:])
print('Item 1 to -1 is', shoplist[1:-1])
print('Item start to end is', shoplist[:])
# Slicing on a string #
print('characters 1 to 3 is', name[1:3])
print('characters 2 to end is', name[2:])
print('characters 1 to -1 is', name[1:-1])
print('characters start to end is', name[:])

shoplist = ['apple', 'mango', 'carrot', 'banana']
split1 = shoplist[::1]
split1 = shoplist[::-1]

bri = set(['brazil', 'russia', 'india'])

print('Simple Assignment')
shoplist = ['apple', 'mango', 'carrot', 'banana']
# mylist is just another name pointing to the same object!
mylist = shoplist
# I purchased the first item, so I remove it from the list
del shoplist[0]
print('shoplist is', shoplist)
print('mylist is', mylist)
# Notice that both shoplist and mylist both print
# the same list without the 'apple' confirming that
# they point to the same object
print('Copy by making a full slice')
# Make a copy by doing a full slice
mylist = shoplist[:]
# Remove first item
del mylist[0]
print('shoplist is', shoplist)
print('mylist is', mylist)
# Notice that now the two lists are different