Cognizant Jr Python Developer Interview Questions and Answers

Q1. What is a Python program that can be used to determine the best price for selling stocks?
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Q2. Can you write a Python program to determine whether two given words are anagrams of each other without using built-in functions?
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Q1. Difference between list & tuple?
Ans. 
List is mutable, tuple is immutable in Python.
• List uses square brackets [], tuple uses parentheses ().

• List elements can be changed, added, or removed, tuple elements cannot be changed.

• Lists are used for collections of items that may need to be modified, tuples are used for fixed collections of items.

• Example: list_example = [1, 2, 3], tuple_example = (4, 5, 6)
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Q2. What is namespace and its types?
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Namespace is a way to organize variables and functions in a program to avoid naming conflicts.
• Namespace helps in avoiding naming conflicts by providing a unique space for each identifier.

• Types of namespaces include global namespace, local namespace, built-in namespace, and module namespace.

• Example: In Python, each module has its own namespace where all the variables and functions defined in that module reside.
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Q3. Write code to explain multiple inheritance
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Multiple inheritance in Python allows a class to inherit attributes and methods from more than one parent class.
• Python supports multiple inheritance by allowing a class to inherit from multiple parent classes.

• The order of parent classes in the inheritance list matters, as methods are searched for in the order they appear.

• Diamond problem can occur in multiple inheritance when two parent classes have a common ancestor cl...read more
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Q4. Define lambda function and give an example?
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Lambda function is an anonymous function defined using the lambda keyword in Python.
• Lambda functions are used for creating small, one-time use functions without a name.

• Syntax: lambda arguments: expression

• Example: double = lambda x: x * 2
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Q5. Oops concept,decorator,iterator.
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Q1. Write a code for reverse an integer?
Ans. 
Use string manipulation to reverse an integer in Python.
• Convert the integer to a string

• Use string slicing to reverse the string

• Convert the reversed string back to an integer
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Q1. Differences between docker image and container
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Docker image is a template used to create containers, while a container is a running instance of an image.
• Docker image is read-only, while a container is a writable instance of an image.

• Multiple containers can be created from the same image, but each container is isolated from others.

• Containers can be started, stopped, moved, and deleted, while images are static and cannot be changed.

• Images are used to package an appli...read more
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String,lists,dict and coding knowledge

Q1. List & tuple diff
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Q2. Pickling & unpickling
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Q1. : Tell me about yourself
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Q2. What is the difference between hard work and smart work? Tell me about the most boring job you have ever had?
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Q1. What is http? rest api?
Ans. 
HTTP is a protocol used for transferring data over the internet. REST API is a set of rules for building web services.
• HTTP stands for Hypertext Transfer Protocol, used for communication between web servers and clients

• REST API (Representational State Transfer) is a set of rules for building web services that adhere to the principles of REST

• RESTful APIs use standard HTTP methods like GET, POST, PUT, DELETE to perform CRU...read more
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Q2. What is time complexity?
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Time complexity refers to the amount of time an algorithm takes to run as a function of the input size.
• It measures how the runtime of an algorithm grows as the input size increases.

• Common time complexities include O(1) constant time, O(log n) logarithmic time, O(n) linear time, O(n^2) quadratic time, and O(2^n) exponential time.

• Understanding time complexity helps in analyzing and optimizing algorithms for efficiency.

• Ex...read more
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