N = 10
hash_table = [[] for _ in range(N)]


def insert(table, key, value):
    hash_key = hash(key) % len(table)
    key_exists = False
    for i, kv in enumerate(table[hash_key]):
        k, v = kv
        if key == k:
            key_exists = True
            break
    if key_exists:
        table[hash_key][i] = ((key, value))
        return False
    else:
        table[hash_key].append((key, value))
        return True


def search(table, key):
    hash_key = hash(key) % len(table)
    for k, v in table[hash_key]:
        if k == key:
            return v
    return None


def delete(table, key):
    hash_key = hash(key) % len(table)
    for i, kv in enumerate(table[hash_key]):
        k, v = kv
        if key == k:
            del table[hash_key][i]
            return True
    return False


insert(hash_table, 10, 'Nepal')
insert(hash_table, 25, 'USA')
insert(hash_table, 20, 'India')
insert(hash_table, 20, 'India2')
insert(hash_table, 21, 'India3')
print(search(hash_table, 21))
delete(hash_table, 21)
print(hash_table)