DCA3104 PYTHON PROGRAMMING SEPTEMBER 2025

Description

SESSION	JULY/SEPTEMBER 2025
PROGRAM	BACHELOR OF COMPUTER APPLICATIONS (BCA)
SEMESTER	5
COURSE CODE & NAME	DCA3104 PYTHON PROGRAMMING

 

 

SET-I

 

 

Q1. Explain different types of data types used in python. 10      

Ans 1.

Different Types of Data Types Used in Python

Python is a highly flexible and dynamically typed programming language, meaning variables do not need explicit type declarations. Its rich set of built-in data types allows developers to handle numbers, text, collections, and logical operations with ease. Understanding these data types is essential because they determine how data is stored, accessed, and manipulated during program execution.

Numeric Data Types

Python supports three numeric types: int, float, and complex. The int type represents whole

 

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Q2.How are local and global variables different from each other? Explain use of global keywords with example. 10   

Ans 2.

Local and Global Variables & Use of Global Keyword

Local Variables

A local variable is defined inside a function and is accessible only within that function’s scope. When a function is called, Python creates a new local namespace where these variables reside. They are destroyed once the function execution is complete. Local variables help avoid conflicts with global variables by limiting access to where they are needed. For example:

def add():

x = 10  # local variable

 

 

 

Q3. What is list? Explain different methods to delete an item from list. 10        

Ans 3.

List and Methods to Delete Items from a List

List

A list in Python is an ordered, mutable collection of elements. Lists can store values of different data types, including integers, floats, strings, and even nested lists. They support indexing, slicing, iteration, and dynamic modification. Lists are widely used for data storage, processing, and manipulation because of their flexibility and rich set of built-in methods.

Deleting Items Using the del Statement

The del statement removes elements based on their index or deletes the entire list. For example,

 

 

SET-II

 

Q4. a) Explain the utility of break, continue, and pass statement using example.

1. b) What does the self-argument signify in the class methods? 5+5

Ans 4.

(a) Utility of break, continue, and pass Statements

Python provides several loop control statements that modify the normal flow of loops. The break statement is used to terminate a loop immediately when a specific condition is met. Once break is executed, the program exits the loop and continues with the next block of code. For example:

for i in range(10):

if i == 5:

break

 

 

Q5. What is exception handling? Explain the process of creating user defined exception with code in python.  10       

Ans 5.

Exception Handling and Creating User-Defined Exceptions in Python

Exception Handling

Exception handling in Python refers to the technique of managing runtime errors so that the program does not terminate unexpectedly. Errors may occur due to invalid input, missing files, division by zero, database failures, or logical mistakes. If such errors are not handled, Python stops program execution immediately. Through exception handling, the programmer anticipates possible errors, surrounds risky code with a try block, and writes appropriate handling logic in except blocks. This ensures the program runs smoothly and users receive informative messages

 

 

Q6. Explain DDL, DML, DCL and TCL commands in detail.    10       

Ans 6.

DDL, DML, DCL, and TCL Commands in Detail

Data Definition Language (DDL)

DDL commands define and modify the structure of a database, including tables, schemas, and constraints. Common DDL commands include CREATE, ALTER, DROP, RENAME, and TRUNCATE. CREATE is used to create new tables or objects. ALTER modifies existing structures by adding or removing columns. DROP permanently deletes database objects. TRUNCATE removes all rows from a table without deleting its structure, offering faster