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Exception Handling in Python

Exception is a run-time error that stops the execution of the program.

Python supports the following blocks for exception handling

1) try : This block is the prone for runtime error.
2) except: This block is used to handle the exception. This block executes only if there is an exception.
3) finally:This block always executes either there is exception or not.

try:
 a=10/0
 print(a)
except:
 print("exception occurred")

Output:
exception occurred

we can also use else which executes if there is no exception.

try:
 a=10/5
except:
 print("exception occurred")
else:
  print(a)

Output:
2 (else excutes as there is no error).

Catch Specific Exception using multiple except:

try:
 a=int(input("enter first number")) 
 b=int(input("enter second number"))
 c=a/b
 print(c)
except ZeroDivisionError:
 print("Division By Zero Error")
except:
 print("It catches all other exception not caught above")

Output:
if user enter 10 & 0 output:Division By Zero Error

if User Enter ram in a or b it comes to general except and print It catches all……….

Nested try and except:

try:
 a=int(input("enter first number")) 
 b=int(input("enter second number"))
 try:
  c=a/b
  print(c)
 except ZeroDivisionError:
  print("Division By Zero Error for inner try")
except:
 print("It catches all other exception not caught above and outer try block")

Output:
if user enter 10 & 0 output:Division By Zero Error for inner try

if User Enter “ram” in a or b it comes to general except and print It catches all other exception……….

Example on finally:

try:
 a=10/0 # finally will always execute if error or not
except:
 print("exception occurred")
finally:
 print("this always executes")

Output:
exception occurred
this always executes

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Exception Handling in Python

Python supports the following blocks for exception handling

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