submittting updated file for assignment 4

calculator.py

@@ -1,3 +1,5 @@
+import traceback
+
 """
 For your homework this week, you'll be creating a wsgi application of
 your own.
@@ -42,14 +44,51 @@
 """
 
 
+def home():
+    return 'This site has four functions which add/subtract/multiply/devide two integers. They can be called out by adding the function followed by back slash a number another back slash and another number to the end of http://localhost:8080.'
+
+
 def add(*args):
     """ Returns a STRING with the sum of the arguments """
 
     # TODO: Fill sum with the correct value, based on the
     # args provided.
-    sum = "0"
+    sum = int(args[0])+int(args[1])
+
+    return str(sum)
+
+
+def subtract(*args):
+    """ Returns a STRING with the sum of the arguments """
+
+    # TODO: Fill sum with the correct value, based on the
+    # args provided.
+    subtract = int(args[0])-int(args[1])
+
+    return str(subtract)
+
+
+def multiply(*args):
+    """ Returns a STRING with the sum of the arguments """
+
+    # TODO: Fill sum with the correct value, based on the
+    # args provided.
+    multiply = int(args[0])*int(args[1])
+
+    return str(multiply)
+
+
+def divide(*args):
+    """ Returns a STRING with the sum of the arguments """
+
+    # TODO: Fill sum with the correct value, based on the
+    # args provided.
+    if args[1] == '0':
+        return "Undefined; attempting to divide by zero."
+    divide = int(args[0])/int(args[1])
+
+    return str(divide)
 
-    return sum
 
 # TODO: Add functions for handling more arithmetic operations.
 
@@ -63,11 +102,24 @@ def resolve_path(path):
     # examples provide the correct *syntax*, but you should
     # determine the actual values of func and args using the
     # path.
-    func = add
-    args = ['25', '32']
+    funcs = {
+        '': home,
+        'add': add,
+        'subtract': subtract,
+        'multiply': multiply,
+        'divide': divide,
+    }
+    path = path.strip('/').split('/')
+    func_name = path[0]
+    args = path[1:]
+    try:
+        func = funcs[func_name]
+    except KeyError:
+        raise NameError
 
     return func, args
 
+
 def application(environ, start_response):
     # TODO: Your application code from the book database
     # work here as well! Remember that your application must
@@ -76,9 +128,30 @@ def application(environ, start_response):
     #
     # TODO (bonus): Add error handling for a user attempting
     # to divide by zero.
-    pass
+    headers = [("Content-type", "text/html")]
+    try:
+        path = environ.get('PATH_INFO', None)
+        if path is None:
+            raise NameError
+        func, args = resolve_path(path)
+        body = func(*args)
+        status = "200 OK"
+    except NameError:
+        status = "404 Not Found"
+        body = "<h1>Not Found</h1>"
+    except Exception:
+        status = "500 Internal Server Error"
+        body = "<h1>Internal Server Error</h1>"
+        print(traceback.format_exc())
+    finally:
+        headers.append(('Content-length', str(len(body))))
+        start_response(status, headers)
+        return [body.encode('utf8')]
+
 
 if __name__ == '__main__':
     # TODO: Insert the same boilerplate wsgiref simple
     # server creation that you used in the book database.
-    pass
+    from wsgiref.simple_server import make_server
+    srv = make_server('localhost', 8080, application)
+    srv.serve_forever()