strip()删除前导和尾随空格字符.

strip() removes leading and trailing whitespace characters.

with open("transfer-out/" + file, "r") as f:
    for line in f:
        cleanedLine = line.strip()
        if cleanedLine: # is not empty
            print(cleanedLine)

然后，您可以将脚本重定向到例如文件python clean_number.py > file.txt.

Then you can redirect the script into a file python clean_number.py > file.txt, for example.