How Can I Redirect Python\'s Print Output to a File and Why Might It Fail?

Output Redirection for Python Code

The query centers around redirecting print statements to a designated text file using Python. Despite employing the sys.stdout technique, the target file remains empty. This article aims to explore the issue and provide alternative solutions.

Utilizing File Objects for Output

The most straightforward approach involves writing directly to a file object:

with open('out.txt', 'w') as f:
    print('Filename:', filename, file=f)  # Python 3.x
    # print >> f, 'Filename:', filename   # Python 2.x

Redirecting Standard Output

Alternatively, stdout redirection can be achieved with the following code:

import sys

orig_stdout = sys.stdout
f = open('out.txt', 'w')
sys.stdout = f

for i in range(2):
    print('i = ', i)

sys.stdout = orig_stdout
f.close()

Employing Standard Library Context Manager

For Python 3.4 and above, a dedicated context manager can simplify this process:

from contextlib import redirect_stdout

with open('out.txt', 'w') as f:
    with redirect_stdout(f):
        print('data')

External Output Redirection

Redirecting output externally via the shell is another viable option:

./script.py > out.txt

Additional Considerations

• Verify the availability of bamfiles within the specified path using glob.glob.
• Utilize os.path.join and os.path.basename for efficient path and filename manipulation.

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