How to Use Multiple `with` Statements for Enhanced File Handling in Python?

Enhancing File Handling with Multiple with Statements

To effectively manage file input and output in Python, the with statement offers an efficient and secure approach. However, the provided code demonstrates a limitation in using it for both input and output files within a single block.

To remedy this, Python provides the ability to place multiple open() calls within a single with statement, separated by commas. This eliminates the need for storing names in an intermediate location and allows for a streamlined and robust code structure.

Here's the modified code snippet that utilizes this technique:

<code class="python">def filter(txt, oldfile, newfile):
    '''\
    Read a list of names from a file line by line into an output file.
    If a line begins with a particular name, insert a string of text
    after the name before appending the line to the output file.
    '''

    with open(newfile, 'w') as outfile, open(oldfile, 'r', encoding='utf-8') as infile:
        for line in infile:
            if line.startswith(txt):
                line = line[0:len(txt)] + ' - Truly a great person!\n'
            outfile.write(line)</code>

This revised code enhances the file handling process by consolidating both input and output operations within a single with statement. It simplifies the code and improves its efficiency by eliminating unnecessary file writes.

By utilizing this technique, developers can write more elegant and efficient code for file input and output operations, leading to improved code maintainability and performance.

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