Exception in python unknown errors

Question

      except ValueError:
        print "the input is Invaild(dd.mm.year)"
    except as e:
        print "Unknown error"
        print e

This is the code I wrote, if an error different then valueerror will happen will it print it in e? thanks

Answer 1

You'll need to catch the BaseException or object here to be able to assign to e:

except ValueError:
    print "the input is Invaild(dd.mm.year)"
except BaseException as e:
    print "Unknown error"
    print e

or, better still, Exception:

except ValueError:
    print "the input is Invaild(dd.mm.year)"
except Exception as e:
    print "Unknown error"
    print e

The blanket except: will catch the same exceptions as BaseException, catching just Exception will ignore KeyboardInterrupt, SystemExit, and GeneratorExit. Not catching these there is generally a good idea.

For details, see the exceptions documentation.

Answer 2

No, that code will throw a SyntaxError:

If you don't know the exception your code might throw, you can capture for just Exception. Doing so will get all built-in, non-system-exiting exceptions:

except ValueError:
    print "the input is Invaild(dd.mm.year)"
except Exception as e:
    print "Unknown error"
    print e