diff --git a/src/00_hello.py b/src/00_hello.py
index 268998dfc7..1dff9b41cb 100644
--- a/src/00_hello.py
+++ b/src/00_hello.py
@@ -1 +1,4 @@
-# Print "Hello, world!" to your terminal
\ No newline at end of file
+# Print "Hello, world!" to your terminal
+
+hello = "Hello, world"
+print(hello)
\ No newline at end of file
diff --git a/src/01_bignum.py b/src/01_bignum.py
index c020928d63..0347ae3f4b 100644
--- a/src/01_bignum.py
+++ b/src/01_bignum.py
@@ -1,4 +1,5 @@
 # Print out 2 to the 65536 power
 # (try doing the same thing in the JS console and see what it outputs)
 
-# YOUR CODE HERE
\ No newline at end of file
+# YOUR CODE HERE
+print(2**65536)
\ No newline at end of file
diff --git a/src/02_datatypes.py b/src/02_datatypes.py
index 245193da34..309be63848 100644
--- a/src/02_datatypes.py
+++ b/src/02_datatypes.py
@@ -14,8 +14,9 @@
 # Write a print statement that combines x + y into the integer value 12
 
 # YOUR CODE HERE
-
+print(int(y) + x)
 
 # Write a print statement that combines x + y into the string value 57
 
-# YOUR CODE HERE
\ No newline at end of file
+# YOUR CODE HERE
+print(f'{x}{y}')
\ No newline at end of file
diff --git a/src/03_modules.py b/src/03_modules.py
index 97eba053c7..fef8ee97e1 100644
--- a/src/03_modules.py
+++ b/src/03_modules.py
@@ -5,27 +5,56 @@
 level operating system functionality.
 """
 
+import getpass
 import sys
+import argparse
+import platform
+import os
+
 # See docs for the sys module: https://docs.python.org/3.7/library/sys.html
 
 # Print out the command line arguments in sys.argv, one per line:
 # YOUR CODE HERE
 
+# Total arguments
+n = len(sys.argv)
+print("Total arguments passed: " + str(n))
+
+# Arguments passed: 
+print("\nName of python script:", sys.argv[0])
+
+print("\nArguments passed:", end = " ")
+for i in range(1, n):
+    print(sys.argv[i], end = " ")
+
 # Print out the OS platform you're using:
 # YOUR CODE HERE
+print("My OS is", os.name)
+
 
 # Print out the version of Python you're using:
 # YOUR CODE HERE
 
+print("My python Version is:", sys.version)
+print("MY python version infi is:", sys.version_info)
 
-import os
 # See the docs for the OS module: https://docs.python.org/3.7/library/os.html
 
 # Print the current process ID
 # YOUR CODE HERE
 
+print("This is my current process ID:", os.getpid())
+
 # Print the current working directory (cwd):
 # YOUR CODE HERE
 
+print("My current working directory is", os.getcwd())
+
 # Print out your machine's login name
 # YOUR CODE HERE
+
+username = os.getlogin()
+username2 = getpass.getuser
+
+print("My computers username is:", username)
+print("MY computers username2 is", username2)
\ No newline at end of file
diff --git a/src/04_printing.py b/src/04_printing.py
index 06aaa7ff16..9fac177baa 100644
--- a/src/04_printing.py
+++ b/src/04_printing.py
@@ -12,6 +12,13 @@
 # y, and z:
 # x is 10, y is 2.25, z is "I like turtles!"
 
+print("x: %2d, y: %2.2f, z: \"%s\"" % (x, y, z))
+
+print("=================================")
+
+
 # Use the 'format' string method to print the same thing
 
-# Finally, print the same thing using an f-string
\ No newline at end of file
+# Finally, print the same thing using an f-
+
+print(f"x = {x}, \ny = {y:.2f}, \nz = \"{z}\"")
diff --git a/src/05_lists.py b/src/05_lists.py
index cfccc4e945..239429044e 100644
--- a/src/05_lists.py
+++ b/src/05_lists.py
@@ -8,22 +8,30 @@
 
 # Change x so that it is [1, 2, 3, 4]
 # YOUR CODE HERE
+x.append(4)
 print(x)
 
 # Using y, change x so that it is [1, 2, 3, 4, 8, 9, 10]
 # YOUR CODE HERE
+x += y
 print(x)
 
 # Change x so that it is [1, 2, 3, 4, 9, 10]
 # YOUR CODE HERE
+x.remove(8)
 print(x)
 
 # Change x so that it is [1, 2, 3, 4, 9, 99, 10]
 # YOUR CODE HERE
+x.insert(5, 99)
 print(x)
 
 # Print the length of list x
 # YOUR CODE HERE
+print(len(x))
+print(x.count)
 
 # Print all the values in x multiplied by 1000
-# YOUR CODE HERE
\ No newline at end of file
+# YOUR CODE HERE
+
+print(list(map(lambda a: a * 1000, x)))
\ No newline at end of file
diff --git a/src/06_tuples.py b/src/06_tuples.py
index 36754da73b..49613de60a 100644
--- a/src/06_tuples.py
+++ b/src/06_tuples.py
@@ -34,11 +34,13 @@ def dist(a, b):
 
 # Write a function `print_tuple` that prints all the values in a tuple
 
-# YOUR CODE HERE
+def print_tuple(tuple):
+    for element in tuple:
+        print(element)
 
 t = (1, 2, 5, 7, 99)
 print_tuple(t)  # Prints 1 2 5 7 99, one per line
 
 # Declare a tuple of 1 element then print it
-u = (1)  # What needs to be added to make this work?
+u = (1,)  # What needs to be added to make this work?
 print_tuple(u)
diff --git a/src/07_slices.py b/src/07_slices.py
index 5e0b3bd8ee..c3775c693d 100644
--- a/src/07_slices.py
+++ b/src/07_slices.py
@@ -12,26 +12,27 @@
 a = [2, 4, 1, 7, 9, 6]
 
 # Output the second element: 4:
-print()
+print(a[1])
 
 # Output the second-to-last element: 9
-print()
+print(a[-2])
 
 # Output the last three elements in the array: [7, 9, 6]
-print()
+print(a[-3:])
 
 # Output the two middle elements in the array: [1, 7]
-print()
+print(a[2:4])
 
 # Output every element except the first one: [4, 1, 7, 9, 6]
-print()
+print(a[1:])
 
 # Output every element except the last one: [2, 4, 1, 7, 9]
-print()
+# When using minus one and the colon to the left the compiler then goes all the way from the last number to the left (-1 to -6)
+print(a[:-1])
 
 # For string s...
 
 s = "Hello, world!"
 
 # Output just the 8th-12th characters: "world"
-print()
\ No newline at end of file
+print(s[7:12])
diff --git a/src/08_comprehensions.py b/src/08_comprehensions.py
index 67eb742e50..366017ffb4 100644
--- a/src/08_comprehensions.py
+++ b/src/08_comprehensions.py
@@ -10,15 +10,18 @@
 
 # Write a list comprehension to produce the array [1, 2, 3, 4, 5]
 
-y = []
+y = [num for num in range(1, 6)]
+print(y)
 
-print (y)
+y1 = []
+for num in range(1, 6):
+    y1.append(num)
+    print(y1)
 
 # Write a list comprehension to produce the cubes of the numbers 0-9:
 # [0, 1, 8, 27, 64, 125, 216, 343, 512, 729]
 
-y = []
-
+y = [num**3 for num in range(10)]
 print(y)
 
 # Write a list comprehension to produce the uppercase version of all the
@@ -26,16 +29,15 @@
 
 a = ["foo", "bar", "baz"]
 
-y = []
+y = [word.upper() for word in a]
 
 print(y)
 
 # Use a list comprehension to create a list containing only the _even_ elements
 # the user entered into list x.
-
 x = input("Enter comma-separated numbers: ").split(',')
 
 # What do you need between the square brackets to make it work?
-y = []
+y = [num for num in x if int(num) % 2 == 0]
 
 print(y)
\ No newline at end of file
diff --git a/src/09_dictionaries.py b/src/09_dictionaries.py
index a8b2911f64..4a8ca13f40 100644
--- a/src/09_dictionaries.py
+++ b/src/09_dictionaries.py
@@ -14,6 +14,7 @@
  - lon: a signed integer representing a longitude value
  - name: a name string for this location
 """
+import json
 
 waypoints = [
     {
@@ -36,12 +37,48 @@
 # Add a new waypoint to the list
 # YOUR CODE HERE
 
+waypoints.append(   {
+        "lat": 120,
+        "lon": -11,
+        "name": "Some random place"
+})
+
+# Another way
+# anotherPlace = { "lat": 42, "lon": -120, "name": "a fourth place"}
+# waypoints.append(anotherPlace)
+# print(waypoints)
+
+# *************How to print json data **************
+# json_data = '[{"ID":10,"Name":"Pankaj","Role":"CEO"},' \
+#             '{"ID":20,"Name":"David Lee","Role":"Editor"}]'
+
+# json_object = json.loads(json_data)
+# json_formatted_str = json.dumps(json_object, indent=2)
+# print(json_formatted_str)
+# dont forget to import json
+
+# with open('EmployeeData.json', 'r') as json_file:
+#     json_object = json.load(json_file)
+
+#     print(json_object)
+#     print(json.dumps(json_object))
+#     print(json.dumps(json_object, indent=1))
+#  **********************************************************
+
+
 # Modify the dictionary with name "a place" such that its longitude
 # value is -130 and change its name to "not a real place"
 # Note: It's okay to access the dictionary using bracket notation on the
 # waypoints list.
 
 # YOUR CODE HERE
+waypoints[0]["lon"] = -130
+waypoints[0]["name"] = "not a real place"
 
 # Write a loop that prints out all the field values for all the waypoints
-# YOUR CODE HERE
\ No newline at end of file
+
+# YOUR CODE HERE
+for i, waypoint in enumerate(waypoints):
+    print(f"Waypoint #{i + 1}")
+    for key, value in waypoint.items():
+        print(f" { key }: {value}")
\ No newline at end of file
diff --git a/src/10_functions.py b/src/10_functions.py
index 5830100c2c..5a3033a7a1 100644
--- a/src/10_functions.py
+++ b/src/10_functions.py
@@ -1,6 +1,8 @@
 # Write a function is_even that will return true if the passed-in number is even.
 
 # YOUR CODE HERE
+def is_even(num):
+    return num % 2 == 0
 
 # Read a number from the keyboard
 num = input("Enter a number: ")
@@ -9,4 +11,7 @@
 # Print out "Even!" if the number is even. Otherwise print "Odd"
 
 # YOUR CODE HERE
-
+if is_even(num):
+    print("Even")
+else:
+     print("Odd")
diff --git a/src/11_args.py b/src/11_args.py
index 8c467ea47f..1a3782e872 100644
--- a/src/11_args.py
+++ b/src/11_args.py
@@ -5,6 +5,8 @@
 # the sum. This is what you'd consider to be a regular, normal function.
 
 # YOUR CODE HERE
+def f1(num1, num2):
+    return num1 + num2
 
 print(f1(1, 2))
 
@@ -14,6 +16,12 @@
 
 # YOUR CODE HERE
 
+def f2(*nums):
+    sum = 0
+    for num in nums:
+        sum += num
+    return sum
+
 print(f2(1))                    # Should print 1
 print(f2(1, 3))                 # Should print 4
 print(f2(1, 4, -12))            # Should print -7
@@ -22,7 +30,7 @@
 a = [7, 6, 5, 4]
 
 # How do you have to modify the f2 call below to make this work?
-print(f2(a))    # Should print 22
+print(f2(*a))    # Should print 22
 
 # Write a function f3 that accepts either one or two arguments. If one argument,
 # it returns that value plus 1. If two arguments, it returns the sum of the
@@ -31,6 +39,9 @@
 
 # YOUR CODE HERE
 
+def f3(num1, num2 = 1):
+    return num1 + num2
+
 print(f3(1, 2))  # Should print 3
 print(f3(8))     # Should print 9
 
@@ -45,6 +56,10 @@
 
 # YOUR CODE HERE
 
+def f4(**keyValues):
+    for key, value in keyValues.items():
+        print("Key: %s, Value: %s" % (key, value))
+
 # Should print
 # key: a, value: 12
 # key: b, value: 30
@@ -62,4 +77,4 @@
 }
 
 # How do you have to modify the f4 call below to make this work?
-f4(d)
+f4(**d)
diff --git a/src/12_scopes.py b/src/12_scopes.py
index bc467fa423..fe00b2f45b 100644
--- a/src/12_scopes.py
+++ b/src/12_scopes.py
@@ -5,9 +5,11 @@
 x = 12
 
 def change_x():
+    global x
     x = 99
 
-change_x()
+    change_x()
+
 
 # This prints 12. What do we have to modify in change_x() to get it to print 99?
 print(x)
@@ -19,6 +21,7 @@ def outer():
     y = 120
 
     def inner():
+        nonlocal y
         y = 999
 
     inner()
diff --git a/src/13_file_io.py b/src/13_file_io.py
index 3c68f8aba2..40b81ce9fd 100644
--- a/src/13_file_io.py
+++ b/src/13_file_io.py
@@ -11,9 +11,19 @@
 
 # YOUR CODE HERE
 
+f = open('foo.txt', 'r')
+print(f.read())
+f.close()
+
 # Open up a file called "bar.txt" (which doesn't exist yet) for
 # writing. Write three lines of arbitrary content to that file,
 # then close the file. Open up "bar.txt" and inspect it to make
 # sure that it contains what you expect it to contain
 
-# YOUR CODE HERE
\ No newline at end of file
+# YOUR CODE HERE
+
+f = open('bar.txt', 'w')
+f.write('Some random text \n')
+f.write('This is some new line of code \n')
+f.write('Some more random stuff to write \n')
+f.close()
\ No newline at end of file
diff --git a/src/14_cal.py b/src/14_cal.py
index 30bb10d113..76ea0c3690 100644
--- a/src/14_cal.py
+++ b/src/14_cal.py
@@ -29,4 +29,17 @@
 
 import sys
 import calendar
-from datetime import datetime
\ No newline at end of file
+from datetime import datetime
+
+def cal(month = datetime.now().month, year = datetime.now().year):
+  print(calendar.month(theyear = int(year), themonth = int(month)))
+
+arg = sys.argv
+if len(arg) == 2:
+  cal(month = arg[1])
+elif len(arg) == 3:
+  cal(arg[1], arg[2])
+elif len(arg) > 3:
+  print('Please provide a month and a year')
+else:
+  cal()
diff --git a/src/15_classes.py b/src/15_classes.py
index 2355dd20b7..71fe2903e6 100644
--- a/src/15_classes.py
+++ b/src/15_classes.py
@@ -3,20 +3,47 @@
 
 # YOUR CODE HERE
 
+class LatLon():
+    def __init__(self, lat, lon):
+        self.lat = lat
+        self.lon = lon
 # Make a class Waypoint that can be passed parameters `name`, `lat`, and `lon` to the
 # constructor. It should inherit from LatLon. Look up the `super` method.
 
 # YOUR CODE HERE
+class Waypoint(LatLon):
+    def __init__(self, name, lat, lon):
+        self.name = name
+        super().__init__(lat, lon)
+
+    def __str__(self):
+        return f'Name: {self.name}, Lat: {self.lat}, Lon: {self.lon}'
 
 # Make a class Geocache that can be passed parameters `name`, `difficulty`,
 # `size`, `lat`, and `lon` to the constructor. What should it inherit from?
 
 # YOUR CODE HERE
 
+class Geocache(Waypoint):
+    def __init__(self, name, difficulty, size, lat, lon):
+        super().__init__(name, lat, lon)
+        self.difficulty = difficulty
+        self.size = size
+
+    def __str__(self):
+        return (f'Name: {self.name}, '\
+                f'Difficulty: {self.difficulty}, '\
+                f'Size: {self.size}, '\
+                f'Lat: {self.lat}, '\
+                f'Lon: {self.lon}')
+
 # Make a new waypoint and print it out: "Catacombs", 41.70505, -121.51521
 
 # YOUR CODE HERE
 
+waypoint = Waypoint('Catacombs', 41.70505, -121.51521)
+print(waypoint)
+
 # Without changing the following line, how can you make it print into something
 # more human-readable? Hint: Look up the `object.__str__` method
 print(waypoint)
@@ -25,5 +52,7 @@
 
 # YOUR CODE HERE
 
+geocache = Geocache('Newberry Views', 1.5, 2, 44.052137, -121.41556)
+
 # Print it--also make this print more nicely
 print(geocache)
diff --git a/src/bar.txt b/src/bar.txt
new file mode 100644
index 0000000000..6f9c558079
--- /dev/null
+++ b/src/bar.txt
@@ -0,0 +1,3 @@
+Some random text 
+This is some new line of code 
+Some more random stuff to write