AttributeError: NoneType object has no attribute lower python

AttributeError: NoneType object has no attribute lower python

You have a Person() class with no firstname. You created it from an empty line in your file:

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list_of_records = [Person(*line.split()) for line in f]n

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An empty line results in an empty list:

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>>> \n.split()n[]n

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which leads to Person(*[]) being called, so a Person() instance was created with no arguments, leaving the default firstname=None.

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Skip empty lines:

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list_of_records = [Person(*line.split()) for line in f if line.strip()]n

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You may also want to default to empty strings, or specifically test for None values before treating attributes as strings:

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def searchFName(self, matchString):n    return bool(self.fname) and matchString.lower() in self.fname.lower()n

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Here bool(self.fname) returns False for empty or None values, giving you a quick False return value when there is no first name to match against:

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>>> p = Person()n>>> p.fname is NonenTruen>>> p.searchFName(foo)nFalsen

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AttributeError: NoneType object has no attribute lower python

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