17_dictionary.py

# A Python dictionary is a data structure that stores the value in key: value pairs. 
# Values in a dictionary can be of any data type and can be duplicated, whereas keys 
# can’t be repeated and must be immutable.

# key value pair
# dictionary
# object
# hash table
# overlap with set

person = {'name' : 'Aminul Islam', 'address' : 'Ctg', 'age' : 34}
print(person) # {'name': 'Aminul Islam', 'address': 'Ctg', 'age': 34}

print(person['name']) # Aminul Islam
print(person.keys())  # dict_keys(['name', 'address', 'age'])
print(person.values()) # dict_values(['Aminul Islam', 'Ctg', 34])
person['language'] = 'Eng' 
print(person) # {'name': 'Aminul Islam', 'address': 'Ctg', 'age': 34, 'language': 'Eng'}
person['name'] = 'Amin'
print(person) # {'name': 'Amin', 'address': 'Ctg', 'age': 34, 'language': 'Eng'}


del person['age']
print(person) # {'name': 'Amin', 'address': 'Ctg', 'language': 'Eng'}

as_list = list(person)
print(as_list)  # ['name', 'address', 'language']


for key, values in person.items():
    print(key, values)
    
    """   name Amin
          address Ctg
          language Eng
    """