feat: add ESQs

4 files changed, 93 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
diff --git a/notebooks/exception_handling.py b/notebooks/exception_handling.py
new file mode 100644
index 0000000..50bf830
--- /dev/null
+++ b/notebooks/exception_handling.py
@@ -0,0 +1,34 @@
+# Exception handling
+# - programming errors
+# - user errors
+# TRY
+#   <statement>
+# EXCEPT
+#   <statement>
+# ENDTRY
+
+def safe_student_open(filename):
+  try:
+    sfile = open(filename, 'rb')
+    sfile.close()
+  except OSError:
+    print("wtf is this file man")
+
+def test_input_integer():
+  val = input("sample input: ")
+  try:
+    value = int(val)
+    print(value)
+    print("It is an integer")
+  except ValueError:
+    print("Noooo bro it isn't an integer cmon man get good")
+# test_input_integer()
+
+def integer(num):
+  try:
+    b = int(num)
+    print(b)
+    print("is integer")
+  except:
+    print("not")
+safe_student_open("thing.data")p
\ No newline at end of file
diff --git a/notebooks/random_access.py b/notebooks/random_access.py
new file mode 100644
index 0000000..ae6fed7
--- /dev/null
+++ b/notebooks/random_access.py
@@ -0,0 +1 @@
+# Accessing a file and its records through random hash
\ No newline at end of file
diff --git a/notebooks/thing.py b/notebooks/thing.py
new file mode 100644
index 0000000..a580117
--- /dev/null
+++ b/notebooks/thing.py
@@ -0,0 +1,22 @@
+import datetime
+import pickle
+import random # data generator
+class Car:
+    def __init__(self, car_id):
+        self.VehicleID = car_id
+        self.__Registration = ""
+        self.__Date = datetime.datetime.now()
+        self.__EngineSize = -1
+        self.__PurchasePrice = 5900_00
+def data_generator():
+    cars = []
+    for i in range(40):
+        s = "ID"
+        for i in range(10):
+            s += str(random.randint(0, 9))
+        cars.append(Car(s))
+    return cars
+with open("cars.dat", 'wb+') as carfile:
+    for car in data_generator():
+        print(car.VehicleID)
+        pickle.dump(car, carfile)
\ No newline at end of file