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Computer Science with Python for Class 12 by Preeti Arora (Sultan Chand & Sons Pvt Ltd.) is a CBSE-aligned textbook covering the complete syllabus: Python functions, exception handling, data file handling (text/CSV/binary), stacks and queues, computer networks, SQL (DDL/DML), and the Python-SQL interface using sqlite3. Each chapter includes solved programs, objective-type questions, board exam practice, and viva questions. Appendices provide quick references and answers. Ideal for board exam aspirants, this book builds coding aptitude and database connectivity skills. Trusted authors and publishers ensure high-quality, error-free content. Available now – the essential guide for Class 12 Computer Science with Python.
Recursion is a function calling itself. It requires a base case to terminate; otherwise, it causes stack overflow. Used for problems like factorial.
read() reads entire file as a string. readline() reads one line at a time, returning empty string after EOF.
Use list append() for push and pop() for pop. Stack follows LIFO – last element inserted is removed first.
HTTP (HyperText Transfer Protocol) for web pages, and FTP (File Transfer Protocol) for file upload/download.
ALTER TABLE Student ADD Age INT; – This DDL command modifies table structure by appending a numeric column.
LAN covers small area (e.g., school lab) with high speed. WAN covers large geographic area (e.g., Internet) with slower speed.
seek(0) moves file pointer to the beginning of the file, allowing data to be re-read from start after reading partially.
HAVING clause filters groups, unlike WHERE which filters rows. Example: GROUP BY city HAVING COUNT(*) > 5.
Bandwidth is maximum data transfer rate of a network path, measured in bits per second (bps). Higher bandwidth means faster transmission.
<class 'float'> because / always returns float. For integer division, use // operator which returns <class 'int'>.
Recursion is a function calling itself. It requires a base case to terminate; otherwise, it causes stack overflow. Used for problems like factorial.
read() reads entire file as a string. readline() reads one line at a time, returning empty string after EOF.
Use list append() for push and pop() for pop. Stack follows LIFO – last element inserted is removed first.
HTTP (HyperText Transfer Protocol) for web pages, and FTP (File Transfer Protocol) for file upload/download.
ALTER TABLE Student ADD Age INT; – This DDL command modifies table structure by appending a numeric column.
LAN covers small area (e.g., school lab) with high speed. WAN covers large geographic area (e.g., Internet) with slower speed.
seek(0) moves file pointer to the beginning of the file, allowing data to be re-read from start after reading partially.
HAVING clause filters groups, unlike WHERE which filters rows. Example: GROUP BY city HAVING COUNT(*) > 5.
Bandwidth is maximum data transfer rate of a network path, measured in bits per second (bps). Higher bandwidth means faster transmission.
<class 'float'> because / always returns float. For integer division, use // operator which returns <class 'int'>.
