Debugging

Author: banerjeesamrat

Chapter10-Debugging/boxPrint.py

@@ -0,0 +1,26 @@
+
+"""
+
+Author: Samrat Banerjee
+Dated: 02/07/2018
+Description: Raising Exceptions
+
+"""
+
+def boxPrint(symbol,width,height):
+    if len(symbol)!=1:
+        raise Exception('Symbol must be a single character string.')
+    if width<=2:
+        raise Exception('Width must be greater than 2.')
+    if height<=2:
+        raise Exception('Height must be greater than 2.')
+    print(symbol*width)
+    for i in range(height-2):
+        print(symbol+(' '*(width-2))+symbol)
+    print(symbol*width)
+
+for sym,w,h in (('*',4,4),('O',20,5),('x',1,3),('ZZ',3,3)):
+    try:
+        boxPrint(sym,w,h)
+    except Exception as err:
+        print('An exception happened: '+str(err)) 

Chapter10-Debugging/buggyAddingProgram.py

@@ -0,0 +1,7 @@
+print('Enter the first number to add:')
+first = input()
+print('Enter the second number to add:')
+second = input()
+print('Enter the third number to add:')
+third = input()
+print('The sum is ' + first + second + third)

Chapter10-Debugging/coinFlip.py

@@ -0,0 +1,16 @@
+
+"""
+
+Author: Samrat Banerjee
+Dated: 17/07/2018
+Description: Breakpoints
+
+"""
+import random
+heads = 0
+for i in range(1, 1001):
+    if random.randint(0, 1) == 1:
+        heads = heads + 1
+    if i == 500:
+        print('Halfway done!')
+print('Heads came up ' + str(heads) + ' times.')

Chapter10-Debugging/errorExample.py

@@ -0,0 +1,14 @@
+"""
+
+Author: Samrat Banerjee
+Dated: 14/07/2018
+Description: Getting Traceback as a String
+
+"""
+
+def spam():
+    bacon()
+def bacon():
+    raise Exception('This is an error message.')
+
+spam()

Chapter10-Debugging/factorialLog.py

@@ -0,0 +1,24 @@
+
+"""
+
+Author: Samrat Banerjee
+Dated: 17/07/2018
+Description: Using the logging Module
+
+"""
+
+import logging
+logging.basicConfig(level=logging.DEBUG, format=' %(asctime)s - %(levelname)s- %(message)s')
+logging.debug('Start of program')
+
+def factorial(n):
+    logging.debug('Start of factorial(%s)' % (n))
+    total = 1
+    for i in range(1,n + 1):
+        total *= i
+        logging.debug('i is ' + str(i) + ', total is ' + str(total))
+    logging.debug('End of factorial(%s)' % (n))
+    return total
+
+print(factorial(5))
+logging.debug('End of program')

Chapter10-Debugging/switchLights.py

@@ -0,0 +1,23 @@
+
+"""
+
+Author: Samrat Banerjee
+Dated: 16/07/2018
+Description: Using an Assertion in a Traffic Light Simulation
+
+"""
+
+market_2nd = {'ns': 'green', 'ew': 'red'}   # market street and 2nd street, ns is north-south
+mission_16th = {'ns': 'red', 'ew': 'green'} #mission street and 16th street, ew is east-west
+
+def switchLights(stoplight):
+    for key in stoplight.keys():
+        if stoplight[key]=='green':
+            stoplight[key]='yellow'
+        elif stoplight[key]=='yellow':
+            stoplight[key]='red'
+        elif stoplight[key]=='red':
+            stoplight[key]='green'
+        assert 'red' in stoplight.values(), 'Neither light is red! ' + str(stoplight)
+
+switchLights(market_2nd)

Chapter9-OrganizingFiles/backupToZip.py

@@ -41,4 +41,4 @@ def backupToZip(folder):
     backupZip.close()
     print("Done.")
 
-backupToZip('/home/samrat/LearningAutomationwithPython')
+backupToZip('/home/samrat/Anything')