Python: Raising Exceptions

‘raise’ statement is used to raise an exception.

Syntax

raise_stmt ::=  "raise" [expression ["from" expression]]

If no expressions are present, raise re-raises the last exception that was active in the current scope. If no exception is active in the current scope, a RuntimeError exception is raised indicating that this is an error.

test.py

while True:
 try:
  dividend = int(input("Enter divisor "))
  divisor = int(input("Enter dividend "))
  
  if divisor==0:
   raise Exception("divisor shouldn't be zero")
   
  print(dividend/divisor)
  break
 except Exception as inst:
  print(inst)

$ python3 test.py 
Enter divisor 2
Enter dividend 0
divisor shouldn't be zero
Enter divisor 23
Enter dividend 43
0.5348837209302325

raise Exception("divisor shouldn't be zero")

‘raise’ statement throws Exception, when divisor is 0.

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