Python Interview Questions for Freshers

1. What is Python?

Python is a high-level and object-oriented programming language with unified semantics designed primarily for developing apps and web. It is the core language in the field of Rapid Application Development (RAD) as it offers options such as dynamic binding and dynamic typing.

2. What are the benefits of Python?

The benefits of Python are as follows:

Speed and Productivity: Utilizing the productivity and speed of Python will enhance the process control capabilities and possesses strong integration.

Extensive Support for Libraries: Python provides a large standard library that includes areas such as operating system interfaces, web service tools, internet protocols, and string protocols. Most of the programming tasks are already been scripted in the standard library which reduces effort and time.

User-friendly Data Structures: Python has an in-built dictionary of data structures that are used to build fast user-friendly data structures.

Existence of Third Party Modules: The presence of third party modules in the Python Package Index (PyPI) will make Python capable to interact with other platforms and languages.

Easy Learning: Python provides excellent readability and simple syntaxes to make it easy for beginners to learn.

3. What are the key features of Python?

The following are the significant features of Python:

Interpreted Language: Python is an interpreted language that is used to execute the code line by line at a time. This makes debugging easy.

Highly Portable: As Python can run on different platforms such as Unix, Macintosh, Linux, Windows, and so on. So, we can say that it is a highly portable language.

Extensible: It ensures that the Python code can be compiled on various other languages such as C, C++ and so on.

GUI programming Support: It implies that Python provides support to develop graphical user interfaces.

4. What type of language is Python? Programming or Scripting?

Python is suitable for scripting, but in general it is considered as a general-purpose programming language.

5. What are the applications of Python?

The applications of Python are as follows:

GUI based desktop applications
Image processing applications
Business and Enterprise applications
Prototyping
Web and web framework applications

6. What is the difference between list and tuple in Python?

The difference between tuple and list are as follows:

ListThe list is mutable (can be changed)
These lists performance is slower
Syntax: list_1 = [20, ‘Mindmajix’, 30]
TupleA tuple is immutable (remains constant)
Tuple performance is faster when compared to lists
Syntax: tup_1 = (20, ‘Mindmajix’, 30)

7. What are the global and local variables in Python?

Global Variables in Python: The variables that are declared outside the function are called global variables. These variables can be accessed or invoked by any function in the program.

8. Define PYTHON PATH?

PYTHON PATH is an environmental variable that is used when we import a module. Suppose at any time we import a module, PYTHON PATH is used to check the presence of the modules that are imported in different directories. Loading of the module will be determined by interpreters.

9. What are the two major loop statements?

for and while.

10. What do you understand by the term PEP 8?

PEP 8 is the Python latest coding convention and it is abbreviated as Python Enhancement Proposal. It is all about how to format your Python code for maximum readability.

11. Define modules in Python?

Module is defined as a file that includes a set of various functions and Python statements that we want to add in our application.

12. What are the built-in datatypes available in Python?

The built-in datatypes in Python are as follows:

Integer.
Complex numbers.
Floating-point numbers.
Strings.
Built-in functions.

13. What are Python Decorators?

Decorator is the most useful tool in Python as it allows programmers to alter the chan

14. What is the difference between list and tuple in Python?

The difference between tuple and list are as follows:

ListThe list is mutable (can be changed)
These lists performance is slower
Syntax: list_1 = [20, ‘Mindmajix’, 30]
TupleA tuple is immutable (remains constant)
Tuple performance is faster when compared to lists
Syntax: tup_1 = (20, ‘Mindmajix’, 30)

15. What is the difference between .py and .pyc files?

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

16. How do you invoke the Python interpreter for interactive use?

By using python or pythonx.y we can invoke Python interpreter. where x.y is the version of the Python interpreter.

17. Define String in Python?

String in Python is formed using a sequence of characters. Value once assigned to a string cannot be modified because they are immutable objects. String literals in Python can be declared using double quotes or single quotes.

18. What do you understand by the term namespace in Python?

A namespace in Python can be defined as a system that is designed to provide a unique name for every object in python.

Types of namespaces that are present in Python are:

Local namespace
Global namespace
Built-in namespace

19. How do you create a Python function?

Functions are defined using the def statement. An example might be def foo(bar):

20. Define iterators in Python?

In Python, an iterator can be defined as an object that can be iterated or traversed upon. In another way, it is mainly used to iterate a group of containers, elements, the same as a list.

21. How does a function return values?

Functions return values using the return statement.

22. Define slicing in Python?

Slicing is a procedure used to select a particular range of items from sequence types such as Strings, lists, and so on.

23. Define package in Python?

In Python packages are defined as the collection of different modules.

24. Which command is used to delete files in Python?

OS.unlink(filename) or OS.remove(filename) are the commands used to delete files in Python Programming.

25. Define pickling and unpickling in Python?

Pickling in Python: The process in which the pickle module accepts various Python objects and converts into a string representation and dumps the file accordingly using dump function is called pickling. Unpickling in Python: The process of retrieving actual Python objects from the stored string representation is called unpickling.

26. Explain the difference between local and global namespaces?

Local namespaces are created within a function when that function is called. Global namespaces are created when the program starts.

27. What is a boolean in Python?

Boolean is one of the built-in data types in Python, it mainly contains two values, and they are true and false. Python bool() is the method used to convert a value to a boolean value.

28. Name some of the built-in modules in Python?

The built-in modules in Python are:

sys module.
OS module.
random module.
collection module.
JSON.
Math module.

29. What are the functions in Python?

In Python, functions are defined as a block of code that is executable only when it is called. The def keyword is used to define a function in Python.

30. What are Dict and List comprehensions in Python?

These are mostly used as syntax constructions to ease the creation of list and dictionaries based on existing iterable.

31. Define the term lambda?

Lambda is the small anonymous function in Python that is often used as an inline function.

32. When would you use triple quotes as a delimiter?

Triple quotes ‘’”” or ‘“ are string delimiters that can span multiple lines in Python. Triple quotes are usually used when spanning multiple lines, or enclosing a string that has a mix of single and double quotes contained therein.

33. Define self in Python?

In Python self is defined as an object or an instance of a class. This self is explicitly considered as the first parameter in Python. Moreover, we can also access all the methods and attributes of the classes in Python programming using self keyword.

34. What is _init_?

The _init_ is a special type of method in Python that is called automatically when the memory is allocated for a new object. The main role of _init_ is to initialize the values of instance members for objects.

35. Define generators in Python?

The way of implementing an effective representation of iterators is known as generators. It is only the normal function that yields expression in the function.

36. Define docstring in Python?

The docstring in Python is also called a documentation string, it provides a way to document the Python classes, functions, and modules.

37. How do we convert the string to lowercase?

lower() function is used to convert string to lowercase.

38. How to remove values from a Python array?

The elements can be removed from a Python array using remove() or pop() function. The difference between pop() and remove() will be explained in the below example.

39. What is Try Block?

A block which is preceded by the try keyword is known as a try block.

40. Why do we use the split method in Python?

split() method in Python is mainly used to separate a given string.

41. How can we access a module written in Python from C?

We can access the module written in Python from C by using the following method.

42. How do you copy an object in Python?

To copy objects in Python we can use methods called<="" p="" style="box-sizing: border-box;">

43. How do we reverse a list in Python?

By using list.reverse(): we can reverse the objects of the list in Python.

44. How can we debug a Python program?

By using the following command we can debug the Python program $ python -m pdb python-script.py

45. Write a program to count the number of capital letters in a file?

with open(SOME_LARGE_FILE) as countletter: count = 0 text = countletter.read() for character in text: if character.isupper(): count += 1

46. Write a program to display the Fibonacci sequence in Python?

# Displaying Fibonacci sequence

n = 10 # first two terms n0 = 0 n1 = 1 #Count x = 0 # check if the number of terms is valid if n <= 0: print(“Enter positive integer”) elif n == 1: print(“Numbers in Fibonacci sequence upto”,n,”:”) print(n0) else: print(“Numbers in Fibonacci sequence upto”,n,”:”) while x < n: print(n0,end=’, ‘) nth = n0 + n1 n0 = n1 n1 = nth x += 1

Output: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34

47. Write a program in Python to produce Star triangle?

The code to produce star triangle is as follows:

def pyfun(r): for a in range(r): print (*(r-x-1)+**(2*x+1)) pyfun(9)

Output: * *** ***** ******* ********* *********** ************* *************** *****************

48. Write a program to check whether the given number is prime or not?

# program to check the number is prime or not n1 = 409 # num1 = int(input(Enter any one number:)) # prime number is greater than 1 if n1 > 1: # check the following factors for x is in range of(2,num1): if (n1 % x) == 0: print(n1,is not a prime number) print(x,times,n1//x,is,num) break else: print(n1,is a prime number) # if input number is smaller than # or equal to the value 1, then it is not prime number else: print(n1,is not a prime number;)

Output: 409 is a prime number

49. Write Python code to check the given sequence is a palindrome or not?

# Python code to check a given sequence # is palindrome or not my_string1 = ‘MOM’ My_string1 = my_string1.casefold() # reverse the given string rev_string1 = reversed(my_string1) # check whether the string is equal to the reverse of it or not if list(my_string1) == list(rev_string1): print(“It is a palindrome”) else: print(“It is not a palindrome”)

Output: it is a palindrome

50. Write Python code to sort a numerical dataset?

The code to sort a numerical dataset is as follows: list = [ 13, 16, 1, 5, 8] list = [int(x) for x in the list] list.sort() print(list)

Output: 1, 5, 8, 13, 16

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Python Interview Questions for Freshers