handle the error

[Irv1n]

I communicate with device and receive data with this function:

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def get_dcv(self):     self.connector.send('DCV?')     return float(self.connector.receive())

sometimes I can get broken data and I get "ValueError: could not convert string to float". How can I exclude and discard the given value and get another value?

[deanhystad]

I would start by understanding what is going on when the Value Error exception is raised. What is returned by receive()? Maybe start with something like this:

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def get_dcv(self):     self.connector.send('DCV?')     try:         value = self.connector.receive()         return float(value)     except ValueError:         print(f"Expecting a float but got '{value}'")     return 0

Now you can see what you get when this error occurs. Do the non-float return values contain important information?

[Irv1n]

What is returned by receive()?

returned values like: 1.0E3, 1.1E3 and so on., then I use this values for calculation.
The error occurs when the self.connector.receive () command receives an incomplete value. And I would like to clip it and get a different value instead.

Do the non-float return values contain important information?

No.

[deanhystad]

What do you mean by "clip it". When I hear that I think "clip the value to be inside some range".

[Irv1n]

just throw out this value

[deanhystad]

I would probably do something like this:

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def get_dcv(self):     self.connector.send('DCV?')     try:         value = self.connector.receive()         return float(value)     except ValueError:         pass     return None

If the get_dcv() returns a non-None value use it, otherwise ignore.

I don't like this as well, but it sounds more like what you are asking for:

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def get_dcv(self):     while True:         self.connector.send('DCV?')         try:             return float(self.connector.receive())         except ValueError:             pass