This document lists and provides examples of 12 common built-in Python exceptions: ZeroDivisionError, ValueError, NameError, IndexError, KeyError, KeyboardInterrupt, TypeError, IOError, OverflowError, AttributeError, ImportError, and UnboundLocalError. Each exception is raised under specific error conditions, such as dividing by zero, invalid data types, undefined variables, out of bounds indexes, missing dictionary keys, import errors, and more. Examples are given to demonstrate how to catch and handle each type of exception.

1. Builtin exception examples
1) ZeroDivisionError (It is raised when number is divided by 0)
a=int(input())
b=int(input())
try:
c=a/b
print(c)
except ZeroDivisionError:
print("b cant be 0")
2) ValueError (It is raised when the arguments passed to the function are of invalid data
type)
Example 1:
try:
a=int(input())
print(a)
except ValueError:
print("Enter integer data only")
Example 2:
import math
try:
print(math.sqrt(-1))
except ValueError:
print("sqrt() must always accept valid type as an argument")
3) NameError (It is raised when identifier is not found in local or global
namespace)
try:

2. print(b)
except NameError:
print("b is not defined")
4) IndexError (It is raised when the index is not found in the sequence or index is
out of range)
try:
s="abcd"
print(s[4])
except IndexError:
print("index out of range")
5) KeyError (It is raised when key is not found in the dictionary)
try:
d={100:"Raju",101:"Ravi"}
print(d[102])
except KeyError:
print("Key is not present in dictionary")
6) KeyboardInterrupt (it is raised when user interrupts program execution by
pressing ctrl+c)
try:
a=int(input())
print(a)
except KeyboardInterrupt:
print("program execution has been terminated by pressing ctrl-c")
7) TypeError (it is raised when invalid operation is performed among different types)

3. try:
s="abcd"/5
print(s)
except TypeError:
print("/ operation is not possible for strings")
8) IOError (it is raised when input or output operation fails)
try:
f=open("file.txt","r")
print(f.read())
except IOError:
print("file does not exist for reading")
9) OverflowError (it is raised when maximum limit of numeric type is exceeded during
calculation)
try:
import math
print(math.pow(2000,1456))
except OverflowError:
print("result is out of range")
10) AttributeError (it is raised when attribute reference fails)
try:
l=[1,2,3]
l.add(4)
except AttributeError as e:

4. print(e) #prints 'list' object has no attribute 'add'
11) ImportError (it is raised when import statement fails)
try:
import koushik
except ImportError as e:
print(e) #No module named 'koushik'
12) UnboundLocalError (it is raised when attempt is made to access local variable in
function when no value has been assigned to it)
a=20
def f():
try:
a=a+1
print(a)
except UnboundLocalError:
print("local variable a is not defined any value but it is referenced")
f()