Computer File Management
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Questions and Answers

What is the primary reason why files are used in programming?

  • To reduce the memory usage of the program
  • To permanently store data in a non-volatile memory (correct)
  • To enhance the speed of the program
  • To temporarily store data during program execution
  • What is the correct order of file operations in Python?

  • Read/Write, Open, Close
  • Close, Read/Write, Open
  • Open, Close, Read/Write
  • Open, Read/Write, Close (correct)
  • What type of file is used to store characters or strings?

  • Binary Files
  • Audio Files
  • Text Files (correct)
  • Image Files
  • What is the main purpose of method overloading?

    <p>To allow different ways to call a method with different parameters</p> Signup and view all the answers

    What is the purpose of the 'Append' file permission?

    <p>To add data to the end of a file</p> Signup and view all the answers

    What happens when you try to read a file that does not exist with the 'Read' file permission?

    <p>An error is raised</p> Signup and view all the answers

    What is a requirement for method overloading?

    <p>Same method name but different parameters</p> Signup and view all the answers

    What is the purpose of the 'Write' file permission?

    <p>To overwrite existing data in a file</p> Signup and view all the answers

    What is the primary purpose of a constructor in a class?

    <p>To declare and initialize data members of a class</p> Signup and view all the answers

    What is the difference between 'Read' and 'Write' file permissions?

    <p>Read is used to read data, while Write is used to write data</p> Signup and view all the answers

    Which of the following statements about the init method is true?

    <p>It is called as soon as an object of a class is instantiated</p> Signup and view all the answers

    What is object-oriented programming?

    <p>A way of building the structure and elements of computer programs</p> Signup and view all the answers

    What type of file is used to store entire data in the form of bytes?

    <p>Binary Files</p> Signup and view all the answers

    What is the purpose of method signature?

    <p>To differentiate methods with the same name</p> Signup and view all the answers

    What is a characteristic of method overloading?

    <p>Same method name but different parameters</p> Signup and view all the answers

    What is a benefit of method overloading?

    <p>More flexibility in coding</p> Signup and view all the answers

    What is the purpose of the 'try' block in Python?

    <p>To test a block of code for errors</p> Signup and view all the answers

    What type of exception is raised when a function receives an argument that has the right type but an inappropriate value?

    <p>ValueError</p> Signup and view all the answers

    What is the purpose of the 'finally' block in Python?

    <p>To execute a block of code regardless of the result of the 'except' block</p> Signup and view all the answers

    What is an example of an invalid input in Python?

    <p>Number divided by zero</p> Signup and view all the answers

    Which statement about structured programming is false?

    <p>Data is accessible from one function to another.</p> Signup and view all the answers

    What is the purpose of the 'except' block in Python?

    <p>To handle errors that occur in the code</p> Signup and view all the answers

    What is the purpose of a constructor in a class?

    <p>To initialize the instance of the class.</p> Signup and view all the answers

    What type of exception is raised when Python cannot find a module?

    <p>ImportError</p> Signup and view all the answers

    What type of attribute in a class is used to access or modify the object state?

    <p>Instance methods.</p> Signup and view all the answers

    What is the purpose of the 'else' block in Python?

    <p>To execute a block of code if no errors were raised</p> Signup and view all the answers

    What is true about objects of the same class?

    <p>All instances of a class share the class variables.</p> Signup and view all the answers

    What type of exception is raised when a file cannot be opened?

    <p>IOError</p> Signup and view all the answers

    What is the limitation of structured programming?

    <p>Data is not accessible from one function to another.</p> Signup and view all the answers

    What is the characteristic of objects in a class?

    <p>Objects have both data and methods.</p> Signup and view all the answers

    What is the purpose of class methods?

    <p>To access and modify both class and instance variables.</p> Signup and view all the answers

    What is the characteristic of static variables?

    <p>Only one copy of the static variable will be created and shared between all objects of the class.</p> Signup and view all the answers

    What is the primary advantage of encapsulation in object-oriented programming?

    <p>Enhancing security of data by protecting it from unauthorized access</p> Signup and view all the answers

    What is the benefit of using getter and setter methods in encapsulation?

    <p>To hide the implementation of data modification from the user</p> Signup and view all the answers

    What is the main advantage of polymorphism in software design?

    <p>Allowing objects of different classes to be treated as objects of a common superclass</p> Signup and view all the answers

    What is the result of using encapsulation in object-oriented programming?

    <p>Improved security and data hiding</p> Signup and view all the answers

    What is the purpose of a getter method in encapsulation?

    <p>To retrieve the value of a data member</p> Signup and view all the answers

    What is a benefit of using polymorphism in software design?

    <p>Enabling flexibility and extensibility in software design</p> Signup and view all the answers

    What is the result of using polymorphism in software design?

    <p>Simplified maintenance of applications</p> Signup and view all the answers

    What is the purpose of a setter method in encapsulation?

    <p>To modify a data member</p> Signup and view all the answers

    Study Notes

    File Operations

    • A file is a named location on disk to store program-related information.
    • Files are used to permanently store data in a non-volatile memory (e.g. Hard disk).
    • File operations in Python take place in the following order:
      • Open a file
      • Read or write (perform operation)
      • Close the file
    • File types include:
      • Text Files - used to store characters or strings
      • Binary Files - store entire data in the form of bytes (i.e., a group of 8 bits each)

    File Permissions

    • Read (r) - File can be 'looked at' by the program but not changed. Error if the file doesn't already exist.
    • Append (a) - File can be added to. File is created if it doesn't already exist.
    • Write (w) - Overwrites existing data, starting from the beginning of the file. File is created if it doesn't already exist.

    Exception Handling

    • IOError - If the file cannot be opened.
    • ImportError - If Python cannot find the module.
    • ValueError - Raised when a function receives an argument that has the right type but an inappropriate value.
    • try - used to test a block of code for errors.
    • except - used to handle errors.
    • finally - used to execute blocks of code regardless of the result of try and except blocks.

    Method Overloading

    • Definition: Defining multiple methods in the same scope (usually in the same class) with the same name but different signatures (number or type of parameters).
    • Purpose: To allow different ways to call a method with different parameters.

    Object-Oriented Programming

    • A constructor is used to define and initialize data members of a class.
    • The primary purpose of a constructor is to declare and initialize data members of a class.
    • The init method is called when an object of a class is instantiated.
    • Method signature must have the same method name but different parameters (not directly supported in Python).
    • Object-Oriented Programming is a fundamental style of computer programming that allows building the structure and elements of computer programs.

    Encapsulation

    • Advantages:
      • Security: Protects an object from unauthorized access.
      • Data Hiding: The user does not know what is going on behind the scene.
      • Allows private and protected access levels to prevent accidental data modification.

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    Description

    This quiz tests your understanding of basic file management concepts, including reading and writing data to files, file permissions, and the importance of permanent storage.

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