[Python-ideas] except expression

[Ethan Furman]

The three use-cases I find compelling are:

# long form
try:
    result = 1/x
except ZeroDivisionError:
    result = NaN  # previously defined

try:
    os.unlink(some_file)
except OSError:
    pass

try:
    result = some_func(value1, value2)
except SomeError:
    result = 42

which would be converted to (using Nick's notation):

result = 1/x except ZeroDivisionError -> NaN

os.unlink(some_file) except OSError -> None

result = some_func(value1, value2) except SomeError -> 42

Clean, clear, concise.

For the record, I could just as easily live with the colon instead of the arrow.

--
~Ethan~