pcewebpython · gapaleo · Oct 2, 2020
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+.vscode
diff --git a/calculator.py b/calculator.py
@@ -1,84 +1,100 @@
-"""
-For your homework this week, you'll be creating a wsgi application of
-your own.
+import traceback
+
+
+def home():
+    page = '''
+    <h1>Welcome to gerardop's WSGI Calculator App<h1>
+    <h2>Addition</h2>
+    <p>To add two integers, visit the page http://localhost:8080/add/integer1/integer2, replacing integer1 and integer2 with the integers you wish to add.</p>
+    <p>Example: <a href="http://localhost:8080/add/26/21">http://localhost:8080/add/27/20</a></p>
+    <h2>Subtraction</h2>
+    <p>To subtract two integers, visit the page http://localhost:8080/subtract/integer1/integer2, replacing integer1 and integer2 with the integers you wish to subtract.</p>
+    <p>Example: <a href="http://localhost:8080/subtract/100/53">http://localhost:8080/subtract/100/53</a></p>
+    <h2>Multiplication</h2>
+    <p>To multiply two integers, visit the page http://localhost:8080/multiply/integer1/integer2, replacing integer1 and integer2 with the integers you wish to multiply.</p>
+    <p>Example: <a href="http://localhost:8080/multiply/11/15">http://localhost:8080/multiply/11/15</a></p>
+    <h2>Division</h2>
+    <p>To divide two integers, visit the page http://localhost:8080/divide/integer1/integer2, replacing integer1 and integer2 with the integers you wish to divide.</p>
+    <p>Example: <a href="http://localhost:8080/divide/235/5">http://localhost:8080/divide/235/5</a></p>
+    '''
+    return page
 
-You'll create an online calculator that can perform several operations.
 
-You'll need to support:
-
-  * Addition
-  * Subtractions
-  * Multiplication
-  * Division
-
-Your users should be able to send appropriate requests and get back
-proper responses. For example, if I open a browser to your wsgi
-application at `http://localhost:8080/multiple/3/5' then the response
-body in my browser should be `15`.
-
-Consider the following URL/Response body pairs as tests:
-
-```
-  http://localhost:8080/multiply/3/5   => 15
-  http://localhost:8080/add/23/42      => 65
-  http://localhost:8080/subtract/23/42 => -19
-  http://localhost:8080/divide/22/11   => 2
-  http://localhost:8080/               => <html>Here's how to use this page...</html>
-```
-
-To submit your homework:
-
-  * Fork this repository (Session03).
-  * Edit this file to meet the homework requirements.
-  * Your script should be runnable using `$ python calculator.py`
-  * When the script is running, I should be able to view your
-    application in my browser.
-  * I should also be able to see a home page (http://localhost:8080/)
-    that explains how to perform calculations.
-  * Commit and push your changes to your fork.
-  * Submit a link to your Session03 fork repository!
+def add(*args):
+    """ Returns a STRING with the sum of the arguments """
+    sum = str(int(args[0]) + int(args[1]))
+    return sum
 
 
-"""
+def subtract(*args):
+    """ Returns a STRING with the difference of the arguments """
+    difference = str(int(args[0]) - int(args[1]))
+    return difference
 
 
-def add(*args):
-    """ Returns a STRING with the sum of the arguments """
+def multiply(*args):
+    """ Returns a STRING with the product of the arguments """
+    product = str(int(args[0]) * int(args[1]))
+    return product
 
-    # TODO: Fill sum with the correct value, based on the
-    # args provided.
-    sum = "0"
 
-    return sum
+def divide(*args):
+    """ Returns a STRING with the quotient of the arguments """
+    quotient = str(int(args[0]) / int(args[1]))
+    return quotient
 
-# TODO: Add functions for handling more arithmetic operations.
 
 def resolve_path(path):
     """
     Should return two values: a callable and an iterable of
     arguments.
     """
-
-    # TODO: Provide correct values for func and args. The
-    # 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
-    # invoke start_response(status, headers) and also return
-    # the body of the response in BYTE encoding.
-    #
-    # 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 ZeroDivisionError:
+        status = '400 Bad Request'
+        body = '''<h1>Bad Request</h1>
+        <p>Can't divide by 0</p>
+        '''
+    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()