A colleague is trying to run a Python 2 script in a Python 3 environment, and the script fails due to a syntax error in the print statement. What would be the likely cause?
- Python 2 has a different file encoding
- Python 2 requires a __future__ import
- Python 2 uses print as a function
- Python 2 uses print as a statement
The likely cause of the syntax error is that Python 2 uses print as a statement, while Python 3 uses it as a function. In Python 3, you need to use parentheses, like print("Hello, World!"), whereas in Python 2, you can use print "Hello, World!".
What could be the possible reasons for a init.py file being empty in some packages?
- It indicates a poorly designed package.
- It prevents the package from being recognized by Python.
- It signifies that the package has no submodules.
- It's a common convention, but it's not necessary.
An empty init.py file in a package signifies that the package has no submodules. It's not required, but it helps Python recognize the directory as a package, enabling relative imports.
How can you embed a docstring within a Python function?
- By adding a leading hyphen
- By enclosing in {} braces
- By prefixing with '#'
- By using triple quotes
In Python, docstrings are embedded within functions using triple quotes (''' or """). They provide documentation and can be accessed using .__doc__.
Functions that return an iterator yielding items instead of a list are called _______.
- Decorators
- Generators
- Lambda Functions
- List Comprehensions
Functions that return an iterator yielding items instead of a list are called 'Generators'. Generators are used to generate values on-the-fly and are memory-efficient.
In the context of Python's GIL (Global Interpreter Lock), which kind of multi-threading is essentially made single-threaded?
- CPU-bound Multi-threading
- I/O-bound Multi-threading
- Multi-process
- Parallel Multi-threading
Python's GIL makes CPU-bound multi-threading essentially single-threaded. GIL ensures that only one thread is executing Python code at a time, which limits the effectiveness of multi-threading for CPU-bound tasks.
A function in Python can return multiple values using a _______.
- list
- return statement
- tuple
- yield statement
In Python, a function can return multiple values by using a tuple. A tuple is an ordered, immutable collection that allows you to return multiple values as a single object.
Which method is used to insert an item at a specified index in a list?
- add()
- append()
- extend()
- insert()
The insert() method is used to insert an item at a specified index in a list. It takes two arguments: the index where the item should be inserted and the item itself.
If an elif block gets executed in a series of if, elif, and else blocks, what happens to the subsequent elif and else blocks?
- They are skipped and not evaluated.
- They are still evaluated, and their conditions are checked.
- They raise an exception.
- They throw a warning but continue execution.
If an 'elif' block gets executed in a series of 'if', 'elif', and 'else' blocks, the subsequent 'elif' and 'else' blocks are skipped and not evaluated. This behavior ensures that only one block is executed.
The operator ^ in Python is used for _______.
- Bitwise XOR
- Exponentiation
- Logical NOT
- String Concatenation
The ^ operator in Python is used for Bitwise XOR, which performs a bitwise exclusive OR operation between two numbers. It flips bits where both numbers have 1s.
The ______ statement in Python is used to resume the loop from the top.
- break
- continue
- goto
- return
The continue statement in Python is used to skip the rest of the current iteration of a loop and resume the loop from the top with the next iteration. It allows you to bypass certain iterations based on a condition.
If you have a break in the inner nested loop, will it terminate only the inner loop or both inner and outer loops?
- Both the inner and outer loops
- It depends on specific cases
- Only the inner loop
- Only the outer loop
A break statement in the inner nested loop will terminate only the inner loop. To break out of both inner and outer loops, you can use labels or flags.
You are creating a custom Matrix class and want to use the standard multiplication symbol (*) to perform matrix multiplication. What should you implement to support this behavior?
- Create a new class, MatrixMultiplier, to handle matrix multiplication.
- Implement a custom function, multiply_matrices(), for matrix multiplication.
- Overload the * operator in the Matrix class to define matrix multiplication.
- Overload the + operator for the Matrix class to perform matrix addition.
To perform matrix multiplication using the * operator, you should overload the * operator in the Matrix class to define the matrix multiplication operation. This is a common use case for operator overloading.