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Python Interview Questions

Frequently Asked Interview Questions And Answers For Python Programming Freshers

What is Python? What Are The Benefits Of Using Python?

Python is an Open Source Programming language with objects, modules, threads, exceptions, and automatic memory management makes it simple and easy, portable, extensible, and built-in Data-structures.

What is PEP 8 In Python?

PEP8 is a set of recommendation that is a coding convention that helps us to write code more readable.

What is Pickling and Unpickling In Python?

We can use the pickle module that 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 called pickling.

While the opposite, the process of retrieving original objects from the stored string representation is called unpickling.

How Python is Interpreted?

Python Program runs directly from the source code written by a program that is converted into the intermediate code again that Is converted into the machine code.

How Memory is Managed in Python?

• The python memory is managed by a private heap that contains all objects and data structures that can’t be accessed by the developers and it is taken care of by the interpreter.
• The core API that allows the programmer access to do the code, the heap space for python objects is done by the Python memory manager.
• Python clears the memory in the garbage collector and recycles it and make it available for the heap space.

What Are The Tools That Help To Find Bugs Or Perform Static Analysis?

We can use a static analysis tool Pychecker that detects the bugs in source code and warns about the style and complexity of the bug. we have another tool named Pylint that checks the module meets the coding standard or not.

What Are Python Decorators?

We use python decorator is used when we want to change in python syntax to alter the functions easily.

What is The Difference Between List and Tuple In Python?

The main difference between the tuple and list Is that list is mutable while tuple is immutable. And tuple can be hashed for used as a key in a dictionary.

How Are Arguments Passed By Value or By Reference In Python?

Here in Python, everything is an object and all the variables have the reference to the objects. As per functions, the references are the values so we can’t change the value of the references.

What is Dictionary and List Comprehensions In Python?

The Dictionary and List Comprehensions are the syntax constructions that make it easy to the creation of a dictionary or list based existing iterable.

What Are The Built-In Type Does Python Provides?

Main two Types: Mutable and Immutable.

Mutable type:
• List
• Sets
• Dictionaries

Immutable built-in types:
• Strings
• Tuples
• Numbers

What is Namespace in Python?

We use Python namespace to find any variable name is located, all the variables are mapped into the object and located somewhere in the place when we search out the name of the variable then this box will be searched to get the corresponding object.

What is Lambda in Python?

We can use Lambda function as a single expression often used as an inline function.

Why Lambda Forms in Python Does Not Have Statements?

We use Lambda form in python to create a new function object and then return it at runtime.

What is Pass in Python?

Pass means no operation Python statement it means that there’s a place holder in a statement where nothing is written, all left blank.

In Python What Are Iterators?

Iterators are a container that is used to iterate the group of elements like a list.

What is Unit Test in Python?

A unit test is a framework used in python for unit testing.it supports sharing of the setups and automation testing and shutdown codes for tests.

In Python What is Slicing?

When we select a arrange from sequence types like lists, string, etc is known as slicing.

What Are Generators in Python?

The methods know as implementing the iterators are known as generators. It is a normal function except it yields the expression in the statement.

What is Doc String in Python?

The way of documenting python functions, modules and classes are known as python documentation string as python docstring.

How can you copy an object in Python?

We can use the copy.copy() pr dop.deppcopy() for general cases and we cant copy all of the objects but most of them.

What is Negative Index in Python?

In Python, indexes can be of two types one is positive starts from 0 and 1 and 2 and so forth while second is negative that starts from -1 then -2 and so forth.

How You Can Convert a Number To a String?

We can convert the number into a string by using inbuilt function str() and if you want to convert it into hexadecimal or octal representation we can use hex() or oct().

What is The Difference Between Xrange and Range?

Xange returns the object of Xrange while range returns the list both uses same memory no matter what size of the range is.

What is Module and Package in Python?

In Python how we write a block of program is a module all the programs are modules in python which imports other modules.

The folder that contains the modules is called package.

Mention What Are The Rules For Local and Global Variables in Python?

Local variables: The value assigned to the variable in the function body is called a local variable.

Global variables: Those variables that are referenced in the function are implicitly global.

How Can You Share Global Variables Across Modules?

We can make a global variable available in different modules in a single program by importing config module in every module, that helps the variable available in different modules.

Explain How Can You Make a Python Script Executable On Unix?

Following Steps are done to make a python script executable to Unix:
• Script file’s mode must be executable and
• the first line of the script must begin with # ( #!/usr/local/bin/python)

Explain How To Delete a File in Python?

We can delete the file by using the os.remove(filename) or os.unlink(filename) command .

Explain How Can You Generate Random Numbers in Python?

We can generate random numbers by importing the random module like the following:
Import random
random.random()
This will return the random numbers in floating point in between(0,1).

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