Python Interview Questions and Answers

Python Interview Questions and Answers

 

How to prepare for a python interview?

The following are the top 5 tips to crack Python Interview:

Learn all the fundamentals of Python and OOps concepts as 90% of the interview start from basics.

Feel free to write code pen and paper Apart from all the above practice is what required.

Building a proper profile will fetch you better results.

Setting up your portfolio might impress your interviewer.

 

1. What is Python? What are the benefits of using Python?

Python may be a programing language with objects, modules, threads, exceptions, and automatic memory management. The benefits of pythons are that it is simple and easy, portable, extensible, build-in data structure and it is open-source.

2. What is PEP 8?

PEP 8 may be a coding convention, a group of recommendations, about the way to write your Python code more readable.

3. What is pickling and unpickling?

The pickle module accepts any Python object and converts it into a string representation and dumps it into a file by using the dump function, this process is named pickling. While the method of retrieving original Python objects from the stored string representation is named unpickling.

4. How Python is interpreted?

Python language is an interpreted language. Python program runs directly from the source code. It converts the ASCII text file that's written by the programmer into an intermediate language, which is again translated into machine language that has got to be executed.

5. How memory is managed in Python?

Python memory is managed by Python private heap space. All Python objects and data structures are located during a private heap. The programmer doesn't have access to the present private heap and therefore the interpreter takes care of this Python private heap.
The allocation of Python heap space for Python objects is completed by the Python memory manager. The core API gives access to some tools for the programmer to code.
Python also has an inbuilt garbage collector, which recycles all the unused memory and frees the memory and makes it available to the heap space.

6. What are the tools that help to seek out bugs or perform the static analysis?

PyChecker may be a static analysis tool that detects the bugs in Python ASCII text file and warns about the design and complexity of the bug. Pylint is another tool that verifies whether the module meets the coding standard.

7. What are Python decorators?

A Python decorator may be a specific change that we make in Python syntax to change functions easily.

8. How does one copy an object in Python?

In Python, the assignment statement (= operator) doesn't copy objects. Instead, it creates a binding between the prevailing object and therefore the target variable name. To create copies of an object in Python, we'd like to use the copy module. Moreover, there are two ways of making copies for the given object using the copy module -

Shallow Copy may be a bit-wise copy of an object. The copied object created has a particular copy of the values within the original object. If either of the values is references to other objects, just the reference addresses for the same are copied.
Deep Copy copies all values recursively from source to target object, i.e. it even duplicates the objects referenced by the source object.
from copy import copy, deep copy

list_1 = [1, 2, [3, 5], 4]

## shallow copy

list_2 = copy(list_1)
list_2[3] = 7
list_2[2].append(6)

list_2 # output => [1, 2, [3, 5, 6], 7]
list_1 # output => [1, 2, [3, 5, 6], 4]

## deep copy

list_3 = deepcopy(list_1)
list_3[3] = 8
list_3[2].append(7)

list_3 # output => [1, 2, [3, 5, 6, 7], 8]
list_1 # output => [1, 2, [3, 5, 6], 4]

9. what's the difference between list and tuple?

The difference between list and tuple is that list is mutable while tuple isn't. A tuple is often hashed for e.g as a key for dictionaries.

10. what's the built-in type does python provides?

There are mutable and Immutable sorts of Pythons built-in types Mutable built-in types

List
Sets
Dictionaries

Immutable built-in types

Strings
Tuples
Numbers

11. What is namespace in Python?

In Python, every name introduced features a place where it lives and maybe hooked for. This is known as a namespace. It is sort of a box where a variable name is mapped to the thing placed. Whenever the variable is searched out, this box is going to be searched, to urge the corresponding object.

12. What is lambda in Python?

It is one expression anonymous function often used as an inline function.

13. Why lambda forms in python doesn't have statements?

A lambda form in python doesn't have statements because it is employed to form a new function object then return them at runtime.

14. What is a pass in Python?

Pass means, no-operation Python statement, or in other words, it's an area holder during a compound statement, where there should be a blank left, and zip has got to be written there.

15. In Python what are iterators?

In Python, iterators are wont to iterate a gaggle of elements, containers sort of a list.

16. What is a unit test in Python?

A unit testing framework in Python is understood as a unit test. It supports the sharing of setups, automation testing, shutdown code for tests, aggregation of tests into collections, etc.

17. How are arguments gone by value or by reference?

Everything in Python is an object and every one variable holds references to the objects. The reference values are according to the functions; as a result, you cannot change the value of the references. However, you'll change the objects if it's mutable.

18. What is Dict and List comprehensions are?

They are syntax constructions to ease the creation of a Dictionary or List supported existing iterable.

19. How will you capitalize the first letter of a string?

Simply using the method capitalize().

20. How will you check if all characters in an alphanumeric are string?

For this, we use the method isalnum().

21. HOW IS PYTHON EXECUTED?

Python files are compiled to bytecode and then executed by the host. Or Else:- Type python .pv at the command line

22. HOW TO INVOKE THE PYTHON INTERPRETER FOR INTERACTIVE USE?

You using the command: python or pythonx.y; where x.y are the version of the Python interpreter desired

23. DIFFERENCE BETWEEN .PY AND .PYC FILES

.py files are Python source files whereas .pyc files are the compiled bytecode files that is generated by the Python compiler

24. WHAT IS FOR-ELSE AND WHILE-ELSE IN PYTHON?

This programming platform provides a unique way of handling loops by providing a function to write else block in case the loop is not satisfying the condition

25. HOW TO INVOKE THE PYTHON INTERPRETER FOR INTERACTIVE USE?

Using the command: python or pythonx.y; where x.y are the version of the Python interpreter desired

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2020-04-29