update demos; remove pygames

demos/fibos/fibo.py

@@ -4,9 +4,10 @@
 $ python3 fibo.py 10
 """
 
-import math
+import sys
 
-def fib(n):    
+
+def fib(n: int) -> None:
     """
     prints Fibonacci series up to nth term
     """
@@ -19,7 +20,8 @@ def fib(n):
         i += 1
     print()
 
-def fib2(n):   
+
+def fib2(n: int) -> list[int]:
     """
     returns list of Fibonacci series up to nth term
     """
@@ -31,12 +33,14 @@ def fib2(n):
     return result
 
 
-def main():
-    import sys
+def main() -> None:
+    """Main function
+    """
     fib(5)
     print(fib2(5))
     fib(int(sys.argv[1]))
     print(fib2(int(sys.argv[1])))
 
+
 if __name__ == "__main__":
     main()

demos/function_unittest/add.py

@@ -1,21 +1,36 @@
 
-def add(a, b) -> int:
+def add(a: int, b: int) -> int:
+    """Add two numbers
+
+    Args:
+        a (int): first number
+        b (int): second number
+
+    Returns:
+        int: sum of a and b
+    """
     return a+b
 
 
-def test_add():
+def test_add() -> None:
+    """Test add function
+    """
     ans = add(10, 20)
     expected = 30
     assert ans == expected
 
 
-def test_add2():
+def test_add2() -> None:
+    """Test add function
+    """
     ans = add(5, 99)
     expected = 104
     assert ans == expected
 
 
-def test_add3():
+def test_add3() -> None:
+    """Test add function
+    """
     ans = add(0, -10)
     excepted = -10
     assert ans == excepted

demos/function_unittest/test_main.py

@@ -1,25 +1,33 @@
 from main import answer, add
 
 
-def test_answer():
+def test_answer() -> None:
+    """Test answer function
+    """
     expected = "Hello World!"
     ans = answer()
     assert ans == expected
 
 
-def test_add():
+def test_add() -> None:
+    """Test add function
+    """
     ans = add(10, 20)
     expected = 30
     assert ans == expected
 
 
-def test_add2():
+def test_add2() -> None:
+    """Test add function
+    """
     ans = add(5, 99)
     expected = 104
     assert ans == expected
 
 
 def test_add3():
+    """Test add function
+    """
     ans = add(0, -10)
     excepted = -10
     assert ans == excepted

demos/modules/main.py

@@ -3,23 +3,28 @@
 Declares question, answer, and areaOfCircle function
 """
 
-import math # first import standard library modules
-import module2 # then import user-defined modules
+import math  # first import standard library modules
+import module2  # then import user-defined modules
 # what happens if the imported the names following way? Uncomment, run the module and find out...
 # from module2 import *
 
-# global variables
-question = "What is the meaning of Life, the Universe, and Everything?"
-answer = 42
+# global variables/CONSTANTS
+QUESTION = "What is the meaning of Life, the Universe, and Everything?"
+ANSWER = 42
 
 # a function
-def areaOfCircle(radius):
+
+
+def area_of_circle(radius):
     """
     Given radius of a circle, finds and returns its area.
     """
     return math.pi*radius**2
 
-def printModuleInfo():
+
+def print_module_info() -> None:
+    """Prints module information
+    """
     import module2
     print(__doc__)
     print(__file__)
@@ -30,16 +35,23 @@ def printModuleInfo():
     print('module2.__name__ = ', module2.__name__)
     print('module2.__package__ = ', module2.__package__)
 
-def accessModule2Names():
-    print(module2.question)
-    print(module2.answer)
 
-def accessThisModuleNames():
-    print(question)
-    print(answer)
-    area = areaOfCircle(3)
-    print("area = {:.2f}".format(area))
+def access_module2_names() -> None:
+    """Access names defined in module2
+    """
+    print(module2.QUESTION)
+    print(module2.ANSWER)
+
+
+def access_this_module_names() -> None:
+    """Access names defined in this module
+    """
+    print(QUESTION)
+    print(ANSWER)
+    area = area_of_circle(3)
+    print(f"area = {area:.2f}")
+
 
 if __name__ == '__main__':
-    accessModule2Names()
-    accessThisModuleNames()    
+    access_module2_names()
+    access_this_module_names()

demos/modules/module2.py

@@ -3,10 +3,10 @@
 circumference function
 """
 import math
-#import module1
+# import module1
 
-question = "What is your quest?"
-answer = "To seek the holy grail."
+QUESTION = "What is your quest?"
+ANSWER = "To seek the holy grail."
 
 
 def circumference(radius):
@@ -15,13 +15,15 @@ def circumference(radius):
     """
     return math.pi*radius*2
 
+
 def test():
     """
     Function to test names defined in this module.
     """
-    print(question)
-    print(answer)
-    print("circumference = {:.2f}".format(circumference(3)))
+    print(QUESTION)
+    print(ANSWER)
+    print(f"circumference={circumference(3)}")
+
 
 # what happens if the import guard is not used and this module is imported?
 # comment out the following if statement and directly call test() and run main.py module to find out!