Merge pull request #1372 from rsikdar213/Exception_Handling_Using_Python

Exception handling using python

Author: geekcomputers

Exception_Handling_in_Python.py

@@ -0,0 +1,119 @@
+#Exception handling using python
+
+
+a = 12
+b = 0
+#a = int(input())
+#b = int(input())
+
+try:
+  c = a/b
+  print(c)
+  #trying to print an unknown variable d
+  print(d)
+  
+except ZeroDivisionError:
+  print("Invalid input. Divisor cannot be zero.")
+  
+except NameError:
+  print('Name of variable not defined.')
+  
+
+#finally statement is always executed whether or not any errors occur
+a = 5
+b = 0
+#a = int(input())
+#b = int(input())
+
+try:
+  c = a/b
+  print(c)
+  
+except ZeroDivisionError:
+  print("Invalid input. Divisor cannot be zero.")
+  
+finally:
+  print('Hope all errors were resolved!!')
+  
+
+#A few other common errors
+#SyntaxError
+
+try:
+  #eval is a built-in-function used in python, eval function parses the expression argument and evaluates it as a python expression.
+  eval('x === x')
+  
+except SyntaxError:
+  print('Please check your syntax.')
+  
+
+#TypeError
+
+try:
+  a = '2' + 2
+  
+except TypeError:    
+  print('int type cannot be added to str type.') 
+  
+
+#ValueError
+
+try:
+  a = int('abc')
+  
+except ValueError:
+  print('Enter a valid integer literal.')
+  
+
+#IndexError 
+
+l = [1,2,3,4]
+
+try:
+  print(l[4])
+  
+except IndexError:
+  print('Index of the sequence is out of range. Indexing in python starts from 0.')
+  
+
+#FileNotFoundError
+
+f = open('aaa.txt','w')   #File aaa.txt created
+f.close()
+
+try:
+  #Instead of aaa.txt lets try opening abc.txt
+  f = open('abc.txt','r')
+
+except FileNotFoundError:
+  print('Incorrect file name used') 
+
+finally:
+  f.close()
+  
+
+#Handling multiple errors in general
+
+try:
+  a = 12/0
+  b = '2' + 2
+  c = int('abc')
+  eval('x===x')
+  
+except:
+  pass 
+  
+finally:
+  print('Handled multiples errors at one go with no need of knowing names of the errors.')
+  
+
+#Creating your own Error
+
+a = 8
+#a = int(input())
+
+if a < 18:
+  raise Exception('You are legally underage!!!')
+
+else:
+  print('All is well, go ahead!!')