# errors.py
'''
Some ways to handle errors.
'''

# Let's first create some errors in our code.
# Errors are not detected by python, but are produced during run time.
a = 5/0.
b = 3+spam
c = '2' + 2

# Here we have created three different errors:
# ZeroDivisionError, NameError and TypeError

# Handle errors:
a = 5.4
a = '5.4'
try:
    b = int(a)
except ValueError:
    print("Not a valid number")

# One can use more than one except clause:
a = 0
try:
    b = int(a)
    c = 1/a
except ValueError:
    print("Not a valid number")
except ZeroDivisionError:
    print("Division by zero")
except (RuntimeError, TypeError, NameError):
    pass

# Explicitely rise the error.
a = 0
try:
    b = 1/a
except:
    raise

raise(ZeroDivisionError)
# raise NameError("MyOwnPrivateError")


# Clean up using the finally clause.
# finally is always executed.
def divide(x, y):
    try:
        result = x / y
    except ZeroDivisionError:
        print("division by zero!")
    else:
        print("result is", result)
    finally:
        print("executing finally clause")