PCAP-31-03 4.3 Equip a Class with Methods PCAP-31 Practice Questions (Page 6)

Questions 26–30

1. 26application · easy

   A team is creating a `Logger` class to handle logging for a web application. They need to define a method `log_error` that takes a message string and writes it to a file. Which code snippet correctly declares this method inside the class?

   • Adef log_error(self, message): # write to file
   • Bclass Logger: def log_error(self, message): # write to file
   • Cclass Logger: def log_error(message): # write to file
   • Dclass Logger: def log_error(self, message, file): # write to file
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2. 27application · easy

   A user has an instance `car` of class `Car`. The class has a method `start_engine` that takes no arguments besides `self`. Which of the following correctly calls this method on the instance?

   • Acar.start_engine(car)
   • Dcar.start_engine()
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4. 28application · medium

   In a `UserProfile` class, the `update_email` method needs to validate the new email and then update the instance's `email` attribute. The validation logic is in another method `validate_email`. Which code correctly uses `self` to call the validation method and update the attribute?

   • Aif validate_email(new_email): self.email = new_email
   • Bif self.validate_email(new_email): email = new_email
   • Cif validate_email(self, new_email): self.email = new_email
   • Dif self.validate_email(new_email): self.email = new_email
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5. 29application · easy

   A developer is explaining to a junior colleague the difference between a method and a function in Python. Which statement accurately describes a key difference?

   • AA method does not require a `self` parameter.
   • BA function is always defined inside a class.
   • CA method can only be called once per program.
   • DA method is defined inside a class and automatically receives the instance as its first argument.
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6. 30application · medium

   In a `TemperatureSensor` class, each sensor has a `reading` attribute. The `calibrate` method must adjust the reading by a given offset. Which implementation correctly modifies the instance's `reading`?

   • Adef calibrate(self, offset): return self.reading + offset
   • Bdef calibrate(self, offset): reading += offset
   • Cdef calibrate(offset): self.reading += offset
   • Ddef calibrate(self, offset): self.reading += offset
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