Question

What is the difference between the following set of statements (a) and (b): a) P = open(“practice.txt”,”r”) P.read(10) b) with open(“practice.txt”,“r”) as P: x = P.read()

Accepted Answer

The main differences between statements (a) and (b) are: 1. File Closing Mechanism: In statement (a), the file is opened using the open() function and must be explicitly closed using P.close() after completing the read operation. In statement (b), the with statement ensures that the file is automatically closed when the block ends, even if an error occurs. 2. Reading Method: Statement (a) uses P.read(10) which reads only 10 characters from the file. Statement (b) uses P.read() without any argument, which reads the entire content of the file and stores it in variable x. — This question tests understanding of file handling in Python. The key differences are: (1) The 'with' statement is a context manager that automatically handles file closing, while the basic open() requires explicit close() - this is important because unclosed files can cause resource leaks. (2) The read(n) method reads specified number of characters, while read() without arguments reads the entire file. The textbook emphasizes the importance of closing files in Question 4, and shows examples of both explicit closing (Program 2-4) and the with statement usage.

Explanation

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