Questions #1

Technical Interview Questions/Python Interview Questions with Answers

B65. How is code executed in python?
Python files are first compiled into bytecode, which is then executed.
B66. What is the parameter passing mechanism in python.
Python uses passing parameters by reference. If you change a parameter inside a function, it will be reflected in the output of the function. However, if you use literals (strings, numbers, tuples) as parameters, then they are passed by value (because they are immutable).
B67. What is with in python?
This instruction ensures that the cleanup code is executed after the execution of the program. For example, you can use it to open a file, do something with it, and automatically close the file when you're done. Similarly, you can open a database connection and automatically close it. The cleanup code is executed even if an exception occurs.
>>> with open('data.txt') as data:
# executable block
B68. How is a .pyc file different from a .py file?
Both files contain bytecode, but .pyc is the compiled version of the python file. Its bytecode is platform independent, so it runs on all platforms that support the .pyc format.
B69. What makes python object-oriented?
It follows the object-oriented programming paradigm, which is built around classes (classes) and their instances (instances). This allows you to implement the following functions:
- hiding the internal data structure
- abstraction
- inheritance
- polymorphism (the ability to choose the right method depending on the type of data)
- data access restriction
B70. What are the object types in Python?
Python supports both mutable and immutable object types.
Immutable do not allow you to change your content. Examples: tuples, booleans, strings, numbers. Iterating over them is faster.
Modifiable allows you to modify your content. Examples: lists, sets, and dictionaries. Iteration over them is slower.