Q.Program 10-5: Create a dictionary ‘ODD’ of odd numbers between 1 and 10, where the key is the decimal number and the value is the corresponding number in words. Perform the following operations on this dictionary:

Build ODD with the odd numbers as keys and their names as values, then each operation is one built-in: keys(), values(), items(), len(), the in operator, indexing by key, and del.

ODD = {1: 'One', 3: 'Three', 5: 'Five', 7: 'Seven', 9: 'Nine'}
ODD.keys()    # dict_keys([1, 3, 5, 7, 9])
ODD.values()  # dict_values(['One', 'Three', 'Five', 'Seven', 'Nine'])
ODD.items()   # pairs as tuples
len(ODD)      # 5
7 in ODD      # True
2 in ODD      # False
ODD[9]        # 'Nine'
del ODD[9]    # removes the pair
``` …

The idea. This program is a tour of the core dictionary interface. The decimal numbers are the keys (they identify entries), the words are the values. Every requested operation maps to a built-in method or operator — nothing needs a loop.

Program 10-5:

ODD = {1: 'One', 3: 'Three', 5: 'Five', 7: 'Seven', 9: 'Nine'}
print("Dictionary ODD:", ODD)
print("(a) Keys:", ODD.keys())
print("(b) Values:", ODD.values())
print("(c) Items:", ODD.items())
print("(d) Length:", len(ODD))
print("(e) Is 7 present?:", 7 in ODD)
print("(f) Is 2 present?:", 2 in ODD)
print("(g) Value of key 9:", ODD[9])
del ODD[9]                                   # (h)
print("(h) After deleting key 9:", ODD)

Verified output:

Dictionary ODD: {1: 'One', 3: 'Three', 5: 'Five', 7: 'Seven', 9: 'Nine'}
(a) Keys: dict_keys([1, 3, 5, 7, 9])
(b) Values: dict_values(['One', 'Three', 'Five', 'Seven', 'Nine'])
(c) Items: dict_items([(1, 'One'), (3, 'Three'), (5, 'Five'), (7, 'Seven'), (9, 'Nine')])
(d) Length: 5
(e) Is 7 present?: True
(f) Is 2 present?: False
(g) Value of key 9: Nine
(h) After deleting key 9: {1: 'One', 3: 'Three', 5: 'Five', 7: 'Seven'}

Operation notes:

• (a)-(c) keys(), values() and items() return view objects (dict_keys, dict_values, dict_items) — live windows onto the dictionary, printable directly and convertible with list() when needed. …