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In which type of loop structures can the break statement be used in Python?

  • both for and while loops
  • for loop
  • neither for nor while loops
  • while loop
The 'break' statement can be used in both 'for' and 'while' loops in Python. It is used to exit the loop prematurely based on a certain condition, making it a useful control structure for loop termination.
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Which method is used to remove a key-value pair from a dictionary by specifying the key?

  • delete()
  • pop()
  • popitem()
  • remove()
The pop() method is used to remove a key-value pair from a dictionary by specifying the key. It returns the value associated with the key and removes the key-value pair from the dictionary. The del statement can also be used to delete a key-value pair by specifying the key. The popitem() method removes and returns an arbitrary key-value pair, while remove() is not a standard dictionary method.
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The _______ method in a context manager returns the resource that will be managed.

  • enter()
  • exit()
  • init()
  • resource()
The 'enter()' method in a context manager returns the resource that will be managed. It is called when entering the 'with' block.
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Which built-in Python function can be used to determine if a class is a subclass of another?

  • inheritsfrom()
  • instanceof()
  • issubclass()
  • subclassof()
You can use the 'issubclass()' built-in function in Python to determine if a class is a subclass of another. This function takes two arguments: the derived class and the base class. If the derived class is indeed a subclass of the base class, it returns True; otherwise, it returns False. This function is commonly used for checking class hierarchies and relationships.
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You are designing a Vector class to represent 2D vectors, and you want to add two vectors using the + operator. How would you implement this?

  • Create a new class, VectorAdder, to handle vector addition.
  • Implement a separate function, add_vectors(), for adding vectors.
  • Overload the + operator in the Vector class, so it combines the x and y components of the vectors.
  • Overload the += operator for the Vector class to support in-place addition of vectors.
The correct approach is to overload the + operator in the Vector class, allowing for a natural syntax for vector addition. This is a common operator overloading scenario.
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The process of converting source code into bytecode, which is then executed by the Python interpreter, is called _______.

  • Compilation
  • Compilation
  • Execution
  • Interpretation
Python uses interpretation, not compilation, to execute code. The process is called interpretation, not compilation.
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Which keyword is used in Python to create a derived class?

  • baseclass
  • class
  • extends
  • superclass
In Python, the 'class' keyword is used to create both base (parent) classes and derived (child) classes. The derived class is created by inheriting from a base class.
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The _______ file can control which modules are imported when 'from package import *' is invoked.

  • import_rules.txt
  • init.py
  • main.py
  • package_config.ini
The init.py file in a Python package can control which modules are imported when 'from package import *' is used. It allows you to define the package's public interface.
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Which of the following statements is true about private attributes in a Python class?

  • Private attributes are accessible and modifiable outside the class, just like public attributes.
  • Private attributes are denoted by a double underscore prefix, such as "__private". They can be accessed and modified outside the class.
  • Private attributes are denoted by a single underscore prefix, such as "_private". They are intended for internal use within the class.
  • Private attributes are inaccessible from outside the class, making them more secure.
Private attributes in Python are typically denoted by a single underscore prefix (e.g., "_private"). While they can still be accessed from outside the class, the convention is to treat them as non-public and for internal use.
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You are writing a nested function, and you want to modify a variable from the outer function. However, you don't want this change to affect the global scope. How can you achieve this?

  • Use the global keyword
  • Use the local keyword
  • Use the nonlocal keyword
  • Use the private keyword
To modify a variable from an outer function without affecting the global scope, use the 'nonlocal' keyword. It allows you to access and modify the variable in the closest outer scope.
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Which of the following is a recommended use case for custom context managers?

  • Basic arithmetic calculations.
  • Closing a file after reading/writing data
  • Sorting a list of integers.
  • Web scraping with BeautifulSoup.
A recommended use case for custom context managers is closing a file after reading or writing data. This ensures proper resource cleanup and prevents resource leaks when dealing with files.
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The variables that are defined inside a function are referred to as _______ variables.

  • Global
  • Instance
  • Local
  • Non-local
Variables defined inside a function are known as 'local' variables. They are only accessible within that function's scope.
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