Answers for "raising exceptions python"

throwing an exception python

raise Exception("message")

buildin exceptions in python

BaseException
 ├── SystemExit                   # Raised by the sys.exit() function.
 ├── KeyboardInterrupt            # Raised when the user hits the interrupt key (ctrl-c).
 └── Exception                    # User-defined exceptions should be derived from this class.
      ├── ArithmeticError         # Base class for arithmetic errors.
      │    └── ZeroDivisionError  # Raised when dividing by zero.
      ├── AttributeError          # Raised when an attribute is missing.
      ├── EOFError                # Raised by input() when it hits end-of-file condition.
      ├── LookupError             # Raised when a look-up on a collection fails.
      │    ├── IndexError         # Raised when a sequence index is out of range.
      │    └── KeyError           # Raised when a dictionary key or set element is not found.
      ├── NameError               # Raised when a variable name is not found.
      ├── OSError                 # Errors such as “file not found” or “disk full” (see Open).
      │    └── FileNotFoundError  # When a file or directory is requested but doesn't exist.
      ├── RuntimeError            # Raised by errors that don't fall in other categories.
      │    └── RecursionError     # Raised when the maximum recursion depth is exceeded.
      ├── StopIteration           # Raised by next() when run on an empty iterator.
      ├── TypeError               # Raised when an argument is of wrong type.
      └── ValueError              # When an argument is of right type but inappropriate value.
           └── UnicodeError       # Raised when encoding/decoding strings to/from bytes fails.

error handling Pyhtin

# taking input from the user 
try:
    age = int(input("Please enter your age: "))
    print(age)
except:
    print("please enter a number instead! ")
    print('bye')


# if you wanna ask their age until they enter the correct number use While Loop
while True:
    try:
        age = int(input("Please enter your age: "))
        print(age)
    except:
        print("please enter a number instead! ")
    else:
        break

python except exception as e

try:
   # Code to test / execute
   print('Test')
except (SyntaxError, IndexError) as E:  # specific exceptions
   # Code in case of SyntaxError for example
   print('Synthax or index error !')
except :
   # Code for any other exception
   print('Other error !')
else:
   # Code if no exception caught
   print('No error')
finally:
   # Code executed after try block (success) or any exception (ie everytime)
   print('Done')

# This code is out of try / catch bloc
print('Anything else')

how to use except statement in python

>>> 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(2, 1)
result is 2.0
executing finally clause
>>> divide(2, 0)
division by zero!
executing finally clause
>>> divide("2", "1")
executing finally clause
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in divide
TypeError: unsupported operand type(s) for /: 'str' and 'str'

catch error data with except python

import sys
try:
	S = 1/0 #Create Error
except: # catch *all* exceptions
    e = sys.exc_info()
    print(e) # (Exception Type, Exception Value, TraceBack)

############
#    OR    #
############
try:
	S = 1/0
except ZeroDivisionError as e:
    print(e) # ZeroDivisionError('division by zero')