feat(examples): errors and handling

Author: ashegde

codes/session_6/errorEg1.py

@@ -0,0 +1,9 @@
+# Open terminal > python3 errorEg1.py
+# Start typing below commands and see the output
+
+while True:
+  try:
+    x = int(input('Please enter a number: '))
+    break
+  except ValueError:
+    print('Invalid number, please try again')

codes/session_6/errorEg2.py

@@ -0,0 +1,14 @@
+# Open terminal > python3 errorEg2.py
+# Start typing below commands and see the output
+
+import sys
+
+for arg in sys.argv[1:]:
+  try:
+    f = open(arg, 'r')
+    print(f.read())
+  except OSError:
+    print('[OS error]: ', arg)
+  else:
+    print(arg, 'has', len(f.readline()), 'lines')
+    f.close()

codes/session_6/errorEg3.py

@@ -0,0 +1,7 @@
+def thisWillFail():
+  x = 1 / 0
+
+try:
+  thisWillFail()
+except ZeroDivisionError as err:
+  print('Handling runtime error: ', err)

codes/session_6/errorEg4.py

@@ -0,0 +1,5 @@
+try:
+  raise NameError('Hi There! I am raising an error!')
+except NameError:
+  print('An exception occured!')
+  raise

codes/session_6/errorEg5.py

@@ -0,0 +1,13 @@
+def divide(x, y):
+  try:
+    result = x / y
+  except ZeroDivisionError:
+    print('Division by zero!')
+  else:
+    print('result is ', result)
+  finally:
+    print('executing finally clause')
+
+divide(45, 5)
+
+divide(45, 0)

codes/session_6/hello.txt

@@ -0,0 +1 @@
+Hello World!