如何用Python代码在Jupyter Notebook选择最新.txt运行及异常排查

Hey there! Let's work through your two questions to get this sorted out.

Instead of relying on shell wildcards that might cause unexpected issues, we can write a straightforward Python script to explicitly find and run the newest .txt file in your Results directory. Here's a reliable implementation:

from pathlib import Path
import subprocess

# Point to your target Results directory
results_folder = Path("Results")

# Fetch all .txt files, sort by last modified time (newest first), pick the top one
newest_txt_file = sorted(
    results_folder.glob("*.txt"),
    key=lambda file: file.stat().st_mtime,
    reverse=True
)[0]

# Build the command to run txt2pdf.py with the newest file
run_command = ["python", "txt2pdf.py", str(newest_txt_file)]

# Execute the command and capture output for debugging
execution_result = subprocess.run(run_command, capture_output=True, text=True)

# Print the output to see the process status
print("Output:\n", execution_result.stdout)
if execution_result.stderr:
    print("\nErrors encountered:\n", execution_result.stderr)

Quick breakdown: #

• pathlib simplifies file path handling and lets us easily find all .txt files in the directory
• We sort files using st_mtime (last modified timestamp) to guarantee we always grab the latest file
• subprocess.run() gives us full control over command execution, and we can capture both standard output and errors to debug any issues

When you run that command in Jupyter, the *.txt wildcard is expanded by the underlying shell. A few likely culprits for the broken u... output:

• Jupyter's shell might cache the list of files, so it doesn't immediately recognize the newly created file
• If txt2pdf.py isn't built to handle multiple files (or processes them in an unordered way), adding a new file could trigger parsing errors
• The new .txt file might have encoding or formatting quirks that cause the script to fail when processing all files at once

The cleanest fix is the code above: by targeting only the newest file explicitly, you avoid wildcard ambiguity and ensure you're only processing the file you intended. No more unexpected behavior when new files are added!

内容的提问来源于stack exchange，提问作者Tyson