dictionary.py

# Dictionaries are made of key-value pairs
# In the example below, names are the keys and values are their ages.

students = {'bilal' : 15, 'ibraheem' : 19, 'luqman' : 15}

print(students)

#add a new key/value pair to the Dictionary
students['imad'] = 18

#Change the value of a key
students['bilal'] = 19

print(students)

#Print all keys
for name in students.keys():
    print("Name: " + name)

#Print all values
for age in students.values():
    print("age:" + str(age))

#Print all keys and values
for name,age in students.items():
    print(name + " is " + str(age) + " years old")

#Dictionary keys have to be immutable

# search in keys.
if 'bilal' in students.keys():
    print("Key(bilal) exists")

# search in values.
if 19 in students.values():
    print("Value 19 exists")