diff --git a/bigos/lecture20250225/for01/for01.py b/bigos/lecture20250225/for01/for01.py
new file mode 100644
index 0000000..1bd448b
--- /dev/null
+++ b/bigos/lecture20250225/for01/for01.py
@@ -0,0 +1,8 @@
+
+
+#https://beginnersbook.com/2018/01/python-for-loop/
+
+for val in range(5):
+	print(val)
+else:
+	print("The loop has completed execution")
diff --git a/bigos/lecture20250225/for01/for02.py b/bigos/lecture20250225/for01/for02.py
new file mode 100644
index 0000000..b6a7153
--- /dev/null
+++ b/bigos/lecture20250225/for01/for02.py
@@ -0,0 +1,15 @@
+# Program to print squares of all numbers present in a list
+# https://beginnersbook.com/2018/01/python-for-loop/
+
+# List of integer numbers
+numbers = [1, 2, 4, 6, 11, 20]
+
+# variable to store the square of each num temporary
+sq = 0
+
+# iterating over the given list
+for val in numbers:
+    # calculating square of each number
+    sq = val * val
+    # displaying the squares
+    print(sq)
diff --git a/bigos/lecture20250225/for01/for03.py b/bigos/lecture20250225/for01/for03.py
new file mode 100644
index 0000000..55be419
--- /dev/null
+++ b/bigos/lecture20250225/for01/for03.py
@@ -0,0 +1,24 @@
+
+print("Print a range(6) ")
+for x in range(6):
+  print(x)
+else:
+  print("Finally finished!")
+
+print("\n\nPrint a range(0, 3) ")
+for x in range(0, 3):
+    print("Value of x = {:d}".format(x) )
+
+
+print("\n\nPrint a range(45, 55) ")
+for x in range(45, 55):
+    print("Value of x = {:d}".format(x) )
+
+
+print("\n\nPrint a range(2, 30, 3) ")
+for x in range(2, 30, 4):
+  print(x)
+
+print("\n\nPrint a range(1, 11, 2) ")
+for x in range(1, 11, 2):
+  print(x)
diff --git a/bigos/lecture20250225/for01/for04.py b/bigos/lecture20250225/for01/for04.py
new file mode 100644
index 0000000..2853ea8
--- /dev/null
+++ b/bigos/lecture20250225/for01/for04.py
@@ -0,0 +1,5 @@
+
+print("Break a string into characters.")
+string = "Hello World"
+for x in string:
+    print(x)
diff --git a/bigos/lecture20250225/for01/for05.py b/bigos/lecture20250225/for01/for05.py
new file mode 100644
index 0000000..3d95e8f
--- /dev/null
+++ b/bigos/lecture20250225/for01/for05.py
@@ -0,0 +1,7 @@
+
+# https://beginnersbook.com/2018/01/python-for-loop/
+
+for num1 in range(0,3):
+	for num2 in range(0, 3):
+		print(num1, ",", num2)
+
diff --git a/bigos/lecture20250225/for01/for06.py b/bigos/lecture20250225/for01/for06.py
new file mode 100644
index 0000000..5310393
--- /dev/null
+++ b/bigos/lecture20250225/for01/for06.py
@@ -0,0 +1,10 @@
+
+# https://www.programiz.com/python-programming/for-loop
+digits = [70, 91, 85]
+
+scoreSum = 0
+for i in digits:
+    print(i)
+    scoreSum += i
+else:
+    print("The average is ",scoreSum/len(digits))
diff --git a/bigos/lecture20250225/lists01/list02.py b/bigos/lecture20250225/lists01/list02.py
new file mode 100644
index 0000000..d64f6e6
--- /dev/null
+++ b/bigos/lecture20250225/lists01/list02.py
@@ -0,0 +1,18 @@
+
+
+myList = [ 7, 5, 3, 9,11, 9999, "bob"]
+
+
+print("The list is ",myList)
+print("The type is ",type(myList))
+print("The length is ", len(myList) )
+print("\n")
+
+counter = 0
+while(counter < len(myList)) :
+    print(f"{counter}   {myList[counter]} ")
+    counter = counter + 1
+
+
+
+
diff --git a/bigos/lecture20250225/lists01/list03.py b/bigos/lecture20250225/lists01/list03.py
new file mode 100644
index 0000000..29f8955
--- /dev/null
+++ b/bigos/lecture20250225/lists01/list03.py
@@ -0,0 +1,27 @@
+
+
+myList = [ 7, 5, 3, 9,11]
+
+
+print("The list is ",myList)
+print("The type is ",type(myList))
+print("The length is ", len(myList) )
+print("\n")
+
+for dummy in myList:
+    print(f"{dummy:3d}  {dummy**2:4d}  {dummy**3:5d}")
+
+print("Done!")
+for listElement in myList:
+    print(f"{listElement:3d}  {listElement**2:4d}  {listElement**3:5d}")
+
+print("Done!")
+
+for x in myList:
+    print(f"{x:3d}  {x**2:4d}  {x**3:5d}")
+
+print("Done!")
+
+
+
+
diff --git a/bigos/lecture20250225/lists01/lists01.py b/bigos/lecture20250225/lists01/lists01.py
new file mode 100644
index 0000000..43ce084
--- /dev/null
+++ b/bigos/lecture20250225/lists01/lists01.py
@@ -0,0 +1,17 @@
+
+
+myList = [ 7, 5, 3, 9]
+
+
+print(myList)
+print(type(myList))
+
+print( len(myList) )
+
+print(myList[0])
+print(myList[1])
+print(myList[2])
+print(myList[3])
+
+# This generates an error when you uncomment it
+#print(myList[4])
diff --git a/bigos/lecture20250225/lists01/names.py b/bigos/lecture20250225/lists01/names.py
new file mode 100644
index 0000000..e49823f
--- /dev/null
+++ b/bigos/lecture20250225/lists01/names.py
@@ -0,0 +1,8 @@
+
+firstNames = [ "Harry", "Rusty", "Katrina", "Jack", "Gimli","Shenanigans", "Mandy"]
+
+print(firstNames)
+print(len(firstNames))
+
+for firstName in firstNames:
+    print(firstName)
diff --git a/bigos/lecture20250225/lists01/names2.py b/bigos/lecture20250225/lists01/names2.py
new file mode 100644
index 0000000..d3c225d
--- /dev/null
+++ b/bigos/lecture20250225/lists01/names2.py
@@ -0,0 +1,14 @@
+
+firstNames = [ "Harry", "Rusty", "Katrina", "Jack", "Gimli","Shenanigans", "Mandy"]
+
+print(firstNames)
+print(len(firstNames))
+
+for firstName in firstNames:
+    print(firstName)
+
+firstNames.sort()
+print(firstNames)
+for firstName in firstNames:
+    print(firstName)
+
diff --git a/bigos/lecture20250225/lists01/powers.py b/bigos/lecture20250225/lists01/powers.py
new file mode 100644
index 0000000..747d005
--- /dev/null
+++ b/bigos/lecture20250225/lists01/powers.py
@@ -0,0 +1,6 @@
+
+powersList = [0,1,2,3,4,5,6,7,8,9,10]
+
+for n in powersList:
+    powerOfTwo = 2**n
+    print(f"{n:2d}    {powerOfTwo:8d}")
diff --git a/bigos/lecture20250225/lists02/dogs-lists08.py b/bigos/lecture20250225/lists02/dogs-lists08.py
new file mode 100644
index 0000000..bb2be27
--- /dev/null
+++ b/bigos/lecture20250225/lists02/dogs-lists08.py
@@ -0,0 +1,15 @@
+# dogs-lists08
+
+dogs = ["Mandy", "Harry", "Shenanigans", "Colorado", "Katrina", "Rusty" ]
+
+# Poor method to print
+print(dogs)
+
+# Print the list
+positionId = 0
+for dog in dogs:
+    print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+print("\n")
+
diff --git a/bigos/lecture20250225/lists02/dogs-lists09.py b/bigos/lecture20250225/lists02/dogs-lists09.py
new file mode 100644
index 0000000..b4b197e
--- /dev/null
+++ b/bigos/lecture20250225/lists02/dogs-lists09.py
@@ -0,0 +1,50 @@
+# dogs-lists09
+
+#Dog Description List format = [<dogname>,<age>,<sex>, <breed>]
+
+dogs = [["Mandy", 2, "F", "Chinook"], ["Harry",11,"M", "Chinook"], ["Shenanigans",8,"F", "Chinook"],
+        ["Colorado",10,"F", "Chinook"], ["Katrina", 9, "F", "Chinook"], ["Rusty",10.5,"M", "Golden Retriever" ],
+        ["Tanner", 16, "M", "Golden Retriever"],["Gimli", 2, "M",  "Chinook"]  ]
+
+# Poor method to print
+print(dogs)
+
+# Print the list
+positionId = 0
+for dog in dogs:
+    print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+
+
+# Print males in the list
+print("\n - These are the male dogs")
+positionId = 0
+for dog in dogs:
+    if dog[2] == "M":
+        print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+print("\n")
+
+# Print females in the list
+print("\n - These are the female dogs")
+positionId = 0
+for dog in dogs:
+    if dog[2] == "F":
+        print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+print("\n")
+
+
+# Print ages in the list
+print("\n - These are the dogs ages")
+positionId = 0
+for dog in dogs:
+    if dog[1] <= 11:
+        print("{}  {}, age = {}".format(positionId,dog,dog[1]))
+    positionId += 1
+
+print("\n")
+
diff --git a/bigos/lecture20250225/lists02/dogs-lists10.py b/bigos/lecture20250225/lists02/dogs-lists10.py
new file mode 100644
index 0000000..99d21df
--- /dev/null
+++ b/bigos/lecture20250225/lists02/dogs-lists10.py
@@ -0,0 +1,55 @@
+# dogs-lists10
+
+#Example using lambda
+
+#Dog Description List format = [<dogname>,<age>,<sex>, <breed>]
+
+dogs = [["Mandy", 2, "F", "Chinook"], ["Harry",11,"M", "Chinook"], ["Shenanigans",8,"F", "Chinook"],
+        ["Colorado",10,"F", "Chinook"], ["Katrina", 9, "F", "Chinook"], ["Rusty",10.5,"M", "Golden Retriever" ],
+        ["Tanner", 16, "M", "Golden Retriever"] ]
+
+# Poor method to print list
+print(dogs)
+
+# Print the list & position
+positionId = 0
+for dog in dogs:
+    print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+
+# Print males in the list
+print("\n - These are the male dogs")
+positionId = 0
+for dog in dogs:
+    if dog[2] == "M":
+        print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+print("\n")
+
+# Print females in the list
+print("\n - These are the female dogs")
+positionId = 0
+for dog in dogs:
+    if dog[2] == "F":
+        print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+print("\n")
+
+print("Sort by sex")
+print(sorted(dogs, key=lambda x: x[2]))
+
+print("Sort by name")
+print(sorted(dogs, key=lambda x: x[0]))
+
+
+print("Sort by age")
+print(sorted(dogs, key=lambda x: x[1]))
+
+print("Sort by breed")
+print(sorted(dogs, key=lambda x: x[3]))
+
+print("\n")
+print(dogs)
diff --git a/bigos/lecture20250225/lists02/dogs-lists10a.py b/bigos/lecture20250225/lists02/dogs-lists10a.py
new file mode 100644
index 0000000..abd1c51
--- /dev/null
+++ b/bigos/lecture20250225/lists02/dogs-lists10a.py
@@ -0,0 +1,57 @@
+# dogs-lists10a
+
+#Example using itemgetter
+
+from operator import itemgetter
+
+#Dog Description List format = [<dogname>,<age>,<sex>, <breed>]
+
+dogs = [["Mandy", 2, "F", "Chinook"], ["Harry",11,"M", "Chinook"], ["Shenanigans",8,"F", "Chinook"],
+        ["Colorado",10,"F", "Chinook"], ["Katrina", 9, "F", "Chinook"], ["Rusty",10.5,"M", "Golden Retriever" ],
+        ["Tanner", 16, "M", "Golden Retriever"] ]
+
+# Poor method to print list
+print(dogs)
+
+# Print the list & position
+positionId = 0
+for dog in dogs:
+    print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+
+# Print males in the list
+print("\n - These are the male dogs")
+positionId = 0
+for dog in dogs:
+    if dog[2] == "M":
+        print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+print("\n")
+
+# Print females in the list
+print("\n - These are the female dogs")
+positionId = 0
+for dog in dogs:
+    if dog[2] == "F":
+        print("{}  {}".format(positionId,dog))
+    positionId += 1
+
+print("\n")
+
+print("Sort by name")
+print(sorted(dogs, key=itemgetter(0)))
+
+
+print("Sort by sex")
+print(sorted(dogs, key=itemgetter(2)))
+
+print("Sort by breed")
+print(sorted(dogs, key=itemgetter(3)))
+
+print("Sort by age")
+print(sorted(dogs, key=itemgetter(1)))
+
+#z = sorted(dogs, key=itemgetter(1))
+#print(type(z),z)
diff --git a/bigos/lecture20250225/lists02/forloopprimer.py b/bigos/lecture20250225/lists02/forloopprimer.py
new file mode 100644
index 0000000..e7cbfe8
--- /dev/null
+++ b/bigos/lecture20250225/lists02/forloopprimer.py
@@ -0,0 +1,19 @@
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+
+primeList = [1, 2, 3, 7, 11, 13, 17]
+
+print(dogNames)
+print(primeList)
+
+
+
+print("Dog Names")
+for aDogName in dogNames:
+    print(aDogName)
+print("\n")
+
+
+print("Prime Numbers")
+for aPrimeNumber in primeList:
+    print(aPrimeNumber)
+print("\n")
diff --git a/bigos/lecture20250225/lists02/fstringprimer.py b/bigos/lecture20250225/lists02/fstringprimer.py
new file mode 100644
index 0000000..bd40fbd
--- /dev/null
+++ b/bigos/lecture20250225/lists02/fstringprimer.py
@@ -0,0 +1,29 @@
+import math
+
+#Integers
+someInteger  = 3
+someInteger2 = 456
+
+#Floats
+someFloat  = 7.
+someFloat2 = 78.9
+dollarAmount = 696.05
+piFloat = math.pi
+
+#Basic Print
+print("Basic Print")
+print(someInteger, someFloat2)
+print(someInteger2, piFloat)
+
+# formatted Print without print spec
+print("Formatted Print without print spec")
+print(f"{someInteger} {someFloat2}")
+print(f"{someInteger2} {piFloat}")
+
+# formatted Print with print spec
+# Note - 8.6f means format a float with a minimum
+# of 8 spaces wide and 6 places to the right of the decimal point.
+print("Formatted Print with print spec")
+print(f"{someInteger:5d} {someFloat2:6.2f}")
+print(f"{someInteger2:5d} {piFloat:8.6f}")
+
diff --git a/bigos/lecture20250225/lists02/lists01-define-and-print.py b/bigos/lecture20250225/lists02/lists01-define-and-print.py
new file mode 100644
index 0000000..1a0d918
--- /dev/null
+++ b/bigos/lecture20250225/lists02/lists01-define-and-print.py
@@ -0,0 +1,41 @@
+#!/usr/bin/python3
+
+# Defining and printing list lengths.
+
+# Lists of text values
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+firstNames = ["edward","david", "Bob","mary","alice"]
+txtList = ["7", "2", "12", "18", "16", "21"]
+
+# Lists of nubers. These could be integers or floats.
+intList = [7, 2, 12, 18, 16, 21]
+primeList = [1, 2, 3, 7, 11, 13, 17, 19]
+
+# Print the entire list
+print("Print the entire list.")
+print (dogNames)
+print(firstNames)
+print(txtList)
+print(intList)
+print(primeList)
+print("\n")
+
+
+# Print the length of the list
+print("Print the length of the lists.")
+print( len(dogNames) )
+print(len(firstNames) )
+print(len(txtList) )
+print(len(intList) )
+print(len(primeList) )
+print("\n")
+
+
+# Print the list and the length
+print("Print the length of the lists.")
+print (dogNames," length = ",len(dogNames))
+print(firstNames," length = ",len(firstNames))
+print(txtList," length = ",len(txtList))
+print(intList," length = ",len(intList))
+print(primeList," length = ",len(primeList))
+
diff --git a/bigos/lecture20250225/lists02/lists02-access-elements-simple.py b/bigos/lecture20250225/lists02/lists02-access-elements-simple.py
new file mode 100644
index 0000000..0090bf1
--- /dev/null
+++ b/bigos/lecture20250225/lists02/lists02-access-elements-simple.py
@@ -0,0 +1,13 @@
+# Create a simple list
+list1 = ["Mary","Harry","Larry","Moe","Alice", "Katrina"]
+
+print("The length of list 1 is ",len(list1))
+
+print( list1[1:4])
+
+print( "list1[0] =", list1[0])
+print( "list1[1] =", list1[1])
+print( "list1[2] =", list1[2])
+print( "list1[3] =", list1[3])
+
+
diff --git a/bigos/lecture20250225/lists02/lists02-access-elements.py b/bigos/lecture20250225/lists02/lists02-access-elements.py
new file mode 100644
index 0000000..a77965d
--- /dev/null
+++ b/bigos/lecture20250225/lists02/lists02-access-elements.py
@@ -0,0 +1,71 @@
+#!/usr/bin/python3
+
+# Accessing List elements.
+
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+firstNames = ["edward","david", "Bob","mary","alice"]
+txtList = ["7", "2", "12", "18", "16", "21"]
+
+intList = [7, 2, 12, 18, 16, 21]
+primeList = [1, 2, 3, 7, 11, 13, 17, 19]
+
+# Same list print as in the first program.
+print (dogNames," length = ",len(dogNames))
+print(firstNames," length = ",len(firstNames))
+print(intList," length = ",len(intList))
+print(primeList," length = ",len(primeList))
+print(txtList," length = ",len(txtList))
+
+# Access each element in a list.
+# The index starts at 0
+# If you uncomment '#print(dogNames[7])'  the program will
+# generate an error. There is no element #7
+print (dogNames," length = ",len(dogNames))
+print("\nOutput for each element index.")
+print(dogNames[0])
+print(dogNames[1])
+print(dogNames[2])
+print(dogNames[3])
+print(dogNames[4])
+print(dogNames[5])
+print(dogNames[6])
+#print(dogNames[7])
+
+
+
+# Access elements from the end of the list. Use
+# negative numbers to access the values starting at the end of the list.
+print (dogNames," length = ",len(dogNames))
+print("\nOutput for each negative element index.")
+print(dogNames[-1])
+print(dogNames[-2])
+print(dogNames[-3])
+print(dogNames[-4])
+print(dogNames[-5])
+print(dogNames[-6])
+print(dogNames[-7])
+#print(dogNames[-8])
+
+# We are getting ahead of ourselves, but we can examine the for loop
+# to print the elements of the list. This loop determines the length
+# of the list and processes every element.
+# Starting with the first element in the list each element in the list will
+# be assigned to aDogName. You ca do anything you like with this one element.
+print("\n")
+print (dogNames," length = ",len(dogNames))
+print("\nOutput from the for loop")
+for aDogName in dogNames:
+    print(aDogName)
+
+print("\n")
+
+# Slices aloow one to access a group of elements from the list.
+print (dogNames," length = ",len(dogNames))
+print("\nPrint list slices. Notice the slice is a new list.")
+# Print elements 1 through element 4
+print(dogNames[1:4])
+# Print elements 4 through the end of the list
+print(dogNames[4:])
+# Print elements from the start of the list through element 4
+print(dogNames[:4])
+
diff --git a/bigos/lecture20250225/lists02/lists03-append-insert-extend-remove.py b/bigos/lecture20250225/lists02/lists03-append-insert-extend-remove.py
new file mode 100644
index 0000000..564c10f
--- /dev/null
+++ b/bigos/lecture20250225/lists02/lists03-append-insert-extend-remove.py
@@ -0,0 +1,58 @@
+#!/usr/bin/python3
+
+# List element manipulation.
+
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+dogNames2 = ["Oscar", "Rusty"]
+
+print (dogNames," length = ",len(dogNames))
+
+print("Append element Rusty to the list.")
+dogNames.append("Rusty")
+print (dogNames," length = ",len(dogNames))
+print("\n")
+
+# Reset dogNames back to the original list
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+# Insert a value into the list
+print("Insert a list into position #2")
+print (dogNames," length = ",len(dogNames))
+print (dogNames2," length = ",len(dogNames2))
+dogNames.insert(2,dogNames2)
+print (dogNames," length = ",len(dogNames))
+print("\n")
+
+# Reset dogNames back to the original list
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+# Insert a list into the list
+print("Append a list at the end")
+print (dogNames," length = ",len(dogNames))
+print (dogNames2," length = ",len(dogNames2))
+dogNames.append(dogNames2)
+print (dogNames," length = ",len(dogNames))
+print("\n")
+
+
+# Reset dogNames back to the original list
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+# Insert a list into the list
+print("Extend a list at the end. This expands the list at the end of the first list.")
+print (dogNames," length = ",len(dogNames))
+print (dogNames2," length = ",len(dogNames2))
+dogNames.extend(dogNames2)
+print (dogNames," length = ",len(dogNames))
+print("\n")
+
+
+# Reset dogNames back to the original list
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+# Insert a list into the list
+print("Remove the value katrina from the list. ")
+print (dogNames," length = ",len(dogNames))
+dogNames.remove("katrina")
+print (dogNames," length = ",len(dogNames))
+print("\n")
+
+
+
+
diff --git a/bigos/lecture20250225/lists02/lists04-pop.py b/bigos/lecture20250225/lists02/lists04-pop.py
new file mode 100644
index 0000000..cde767f
--- /dev/null
+++ b/bigos/lecture20250225/lists02/lists04-pop.py
@@ -0,0 +1,34 @@
+#!/usr/bin/python3
+
+# List operating as a stack.
+
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+dogNames2 = ["Oscar", "Rusty"]
+
+firstNames = ["edward","david", "Bob","mary","alice"]
+
+intList = [7, 2, 12, 18, 16, 21]
+primeList = [1, 2, 3, 7, 11, 13, 17, 19]
+
+txtList = ["7", "2", "12", "18", "16", "21"]
+
+print("pop() can be used to implement a stack. A stack is a last in first out")
+print(" (LIFO) structure used in some program logic.")
+print (dogNames," length = ",len(dogNames))
+dName = dogNames.pop()
+print(f"Popped {dName:s}")
+print (dogNames," length = ",len(dogNames))
+dName = dogNames.pop()
+print(f"Popped {dName:s}")
+print (dogNames," length = ",len(dogNames))
+dName = dogNames.pop()
+print(f"Popped {dName:s}")
+print (dogNames," length = ",len(dogNames))
+print("\n\n")
+
+print("There is no push but we can append")
+dogNames.append("Colorado")
+
+print (dogNames," length = ",len(dogNames))
+
+
diff --git a/bigos/lecture20250225/lists02/lists05-sort.py b/bigos/lecture20250225/lists02/lists05-sort.py
new file mode 100644
index 0000000..61fe67f
--- /dev/null
+++ b/bigos/lecture20250225/lists02/lists05-sort.py
@@ -0,0 +1,43 @@
+#!/usr/bin/python3
+
+# List sorting.
+
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+firstNames = ["edward","david", "Bob","mary","alice"]
+intList = [7, 2, 12, 18, 16, 21]
+primeList = [1, 2, 3, 7, 11, 13, 17, 19]
+txtList = ["7", "2", "12", "18", "16", "21"]
+
+print (dogNames," length = ",len(dogNames))
+print(firstNames," length = ",len(firstNames))
+print(intList," length = ",len(intList))
+print(primeList," length = ",len(primeList))
+print(txtList," length = ",len(txtList))
+
+print("Reverse a list")
+dogNames.reverse()
+print (dogNames," length = ",len(dogNames))
+print("\n")
+
+print("Sort a text list")
+dogNames.sort()
+print (dogNames," length = ",len(dogNames))
+print("\n")
+
+print("Sort a number list")
+intList.sort()
+print (intList," length = ",len(intList))
+print("\n")
+
+print("Sum a number list")
+mySum = sum(intList)
+print (intList," sum = ",mySum)
+print("\n")
+
+print("Sort a text list of number strings")
+txtList.sort()
+print (txtList," length = ",len(txtList))
+print("\n")
+
+
+
diff --git a/bigos/lecture20250225/lists02/lists06-membership.py b/bigos/lecture20250225/lists02/lists06-membership.py
new file mode 100644
index 0000000..0e6a7fb
--- /dev/null
+++ b/bigos/lecture20250225/lists02/lists06-membership.py
@@ -0,0 +1,14 @@
+#!/usr/bin/python3
+
+# List membership.
+
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+firstNames = ["edward","david", "Bob","mary","alice"]
+
+print(firstNames)
+# A match is found.
+print("Is david in firstNames ? ",'david' in firstNames)
+# Matches are case sensitive
+print("Is David in firstNames ? ",'David' in firstNames)
+# harry is not in the list of firstNames
+print("Is harry in firstNames ? ",'harry' in firstNames)
diff --git a/bigos/lecture20250225/lists02/lists07-join-split.py b/bigos/lecture20250225/lists02/lists07-join-split.py
new file mode 100644
index 0000000..e3f8fa2
--- /dev/null
+++ b/bigos/lecture20250225/lists02/lists07-join-split.py
@@ -0,0 +1,53 @@
+#!/usr/bin/python3
+
+# List join and split.
+
+dogNames = [ "harry", "Shenanigans","katrina","Tanner","Yukon Jack", "Colorado","Mandy"]
+firstNames = ["edward","david", "Bob","mary","alice"]
+
+# A simple loop to print every element in the list. The print() statement
+# automatically generates a newline at the end of each print.
+print("Print each name in the list.")
+print(firstNames)
+for aName in firstNames:
+    print(aName)
+print("\n")
+
+# Join all elements in the list to a single comma separated list
+print("Join the elements in the list to a single comma-separated list.")
+print(firstNames)
+nameString = ','.join(firstNames)
+print(nameString,"\n")
+
+# Split all elements in the string into a list
+print("Split the elements in the string into a list.")
+print(nameString)
+myNewList = nameString.split(',')
+print(myNewList,"\n")
+
+print("Now check membership in original list")
+print("Is david in myNewList ? ",'david' in myNewList)
+print("Exact match \n")
+
+# Split all elements in the string into a list
+# Notice the effect of extra spaces.
+nameString2 = "edward ,david ,Bob ,mary ,alice"
+print("Split the elements in the string with extra space into a list.")
+print(nameString2)
+myNewList = nameString2.split(',')
+print(myNewList,"\n")
+
+print("Now check membership in original list")
+print("Is david in myNewList ? ",'david' in myNewList)
+print("False match because 'david' does not equal 'david ' \n")
+
+# Split a string into a list of characters
+sampleString = "This is a sample string of characters."
+listOfCharacters = list(sampleString)
+print("My new list is \n",listOfCharacters,"\nLength = ", len(listOfCharacters),"\n")
+
+print("What happens if you reverse it, then reassemble the string?")
+listOfCharacters.reverse()
+print(listOfCharacters)
+myNewString = ''.join(listOfCharacters)
+print(myNewString)