Blossom app (Hash)

from linked_list import Node, LinkedList
from blossom_lib import flower_definitions
class HashMap:
  def __init__(self,size):
    self.array_size = size
    self.array = [LinkedList() for item in range(self.array_size)]
    
  def hash(self,key):
    key_bytes = key.encode()
    hash_code = sum(key_bytes)
    return hash_code
  
  def compress(self,hash_code):
    return hash_code % self.array_size
  
  def assign(self,key,value):
    array_index = self.compress(self.hash(key))
    payload = Node([key, value])
    list_at_array = self.array[array_index]
    for item in list_at_array:
      if key == item[0]:
        item[1] = value
    list_at_array.insert(payload)
    
  def retrieve(self, key):
    array_index = self.compress(self.hash(key))
    list_at_index = self.array[array_index]
    for item in list_at_index:
      if item[0] == key:
        return item[1]
      else:
        return None
blossom = HashMap(len(flower_definitions))     
for flower in flower_definitions:
  blossom.assign(flower[0],flower[1])
print(blossom.retrieve('daisy'))