topic Re: Bug Report: Gear script crashed with divide by zero error in Fusion Support Forum

Bug Report: Gear script crashed with divide by zero error

hex4def6 — Wed, 03 Jun 2020 23:12:19 GMT

Tools / add-ins / SpurGear

Try to type "0" in module field (in my example, I want to use 0.7 as module). Note error that appears:

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Fusion 360
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Failed:
Traceback (most recent call last):
File "C:/Users/SS/AppData/Local/Autodesk/webdeploy/production/1f559bb8ae333199306b5c4f1fe680c6eb7ab9e0/Python/Samples/SpurGear/SpurGear.py", line 390, in notify
diaPitch = 25.4 / result[1]
ZeroDivisionError: float division by zero

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OK
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Re: Bug Report: Gear script crashed with divide by zero error

hex4def6 — Wed, 03 Jun 2020 23:48:18 GMT

OK, I seemed to have fixed the error checking with the following:

Line 385 onwards:

if result[0] and result[1] > 0:

diaPitch = result[1]

elif _standard.selectedItem.name == 'Metric':

result = getCommandInputValue(_module, '')

if result[0] and result[1] > 0:

diaPitch = 25.4 / result[1]

if not diaPitch == None:

if _numTeeth.value.isdigit():

numTeeth = int(_numTeeth.value)

pitchDia = numTeeth/diaPitch

and line 444 onwards:

elif result[1] <= 0:

_errMessage.text = 'The diametral pitch must be greater than 0'

eventArgs.areInputsValid = False

else:

diaPitch = result[1]

elif _standard.selectedItem.name == 'Metric':

result = getCommandInputValue(_module, '')

if result[0] == False:

eventArgs.areInputsValid = False

return

elif result[1] <= 0:

_errMessage.text = 'The module must be greater than 0'

eventArgs.areInputsValid = False

return

Re: Bug Report: Gear script crashed with divide by zero error

warnerjonn — Thu, 16 Jun 2022 07:09:36 GMT

The super class of ZeroDivisionError is ArithmeticError. This exception raised when the second argument of a division or modulo operation is zero. In Mathematics, when a number is divided by a zero, the result is an infinite number. It is impossible to write an Infinite number physically. Python interpreter throws “ZeroDivisionError” error if the result is infinite number. While implementing any program logic and there is division operation make sure always handle ArithmeticError or ZeroDivisionError so that program will not terminate.

try:

z = x / y
except ZeroDivisionError:
z = 0

Or check before you do the division:

if y == 0:
z = 0
else:
z = x / y

The latter can be reduced to:

z = 0 if y == 0 else (x / y)