feat: add ESQs

1 files changed, 36 insertions, 0 deletions

diff --git a/notebooks/esq_ch_26.py b/notebooks/esq_ch_26.py
new file mode 100644
index 0000000..1ef4dc7
--- /dev/null
+++ b/notebooks/esq_ch_26.py
@@ -0,0 +1,36 @@
+import pickle
+import random
+DATA_FILE = "CustomerData.DAT"
+class CustomerRecord:
+  def __str__(self) -> str:
+    return f"{self.CustomerID}"
+  def __init__(self):
+    self.CustomerID = random.randint(100001, 1000000) 
+    self.CustomerName = ""
+    self.TelephoneNumber = ""
+    self.OrderValueTotal = 0
+customers = [CustomerRecord() for i in range(0, 1000)]
+def Hash(CustomerID: int) -> int:
+  return CustomerID % 1000
+CustomerData = [None for i in range(0, 1000)]
+def AddRecord(Customer: CustomerRecord):
+  offset = 0
+  while CustomerData[Hash(Customer.CustomerID) + offset] != None:
+    offset += 1
+  CustomerData[Hash(Customer.CustomerID) + offset] = Customer
+def FindRecord(customer_id: int) -> CustomerRecord:
+  starting = Hash(customer_id)
+  offset = 0
+  while CustomerData[starting + offset].CustomerID != customer_id:
+    offset += 1
+  return CustomerData[starting + offset]
+def StoreRecords(filename = DATA_FILE):
+  with open(filename, 'wb') as file:
+    for customer in CustomerData:
+      pickle.dump(customer, file)
+    file.close()
+for i in range(20):
+  AddRecord(CustomerRecord())
+for i in range(len(CustomerData)):
+  if CustomerData[i] != None:
+    print(f"[{i}] {CustomerData[i]} {'-> Collision!' if Hash(CustomerData[i].CustomerID) != i else ''}")
\ No newline at end of file