Subprocess.run() 找不到文件，即使 path.exists() 返回 true

Question

我找到了这两个页面：

Subprocess.run() cannot find path

Python3 Subprocess.run cannot find relative referenced file

但这没有帮助。第一页谈论使用​​\\，但我已经这样做了，第二页谈论围绕其中一个论点的双引号。

work = Path("R:\\Work")
resume = work.joinpath("cover_letter_resume_base.doc")

current_date = construct_current_date()

company_name = gather_user_information(question="Company name: ", 
                                        error_message="Company name cannot be empty")

position = gather_user_information(question="Position: ", 
                                   error_message="Position cannot be empty")

# Construct destination folder string using the company name, job title, and current date
destination = work.joinpath(company_name).joinpath(position).joinpath(current_date)

# Create the destintion folder
os.makedirs(destination, exist_ok=True)

# Construct file name
company_name_position = "{0}_{1}{2}".format(company_name.strip().lower().replace(" ", "_"), 
                                position.strip().lower().replace(" ", "_"), resume.suffix)

resume_with_company_name_job_title = resume.stem.replace("base", company_name_position)
destination_file = destination.joinpath(resume_with_company_name_job_title)

# Copy and rename the resume based on the company and title.
shutil.copy2(src=resume, dst=destination_file)

if destination_file.exists():
    print(f"{destination_file} created.")
    #subprocess.run(["open", str(destination_file)], check=True)

程序从用户那里获取公司名称和职位，生成当前日期，创建目录，然后根据用户输入移动/重命名基本简历。

输出和结果：

Company name: Microsoft
Position: Software Eng
R:\Work\Microsoft\Software Engineer\20190722\cover_letter_resume_microsoft_software_eng.doc 
created.

错误信息：

[WinError 2] The system cannot find the file specified

Traceback (most recent call last):
  File "c:/Users/Kiska/python/job-application/main.py", line 59, in <module>
    main()
  File "c:/Users/Kiska/python/job-application/main.py", line 53, in main
    raise error
  File "c:/Users/Kiska/python/job-application/main.py", line 48, in main
    subprocess.run(["start", str(destination_file)], check=True)
  File "C:\Program Files (x86)\Python37-32\lib\subprocess.py", line 472, in run
    with Popen(*popenargs, **kwargs) as process:
  File "C:\Program Files (x86)\Python37-32\lib\subprocess.py", line 775, in __init__
    restore_signals, start_new_session)
  File "C:\Program Files (x86)\Python37-32\lib\subprocess.py", line 1178, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified

if 语句返回True 但subprocess.run() 看不到文件，但我不太确定为什么。

Answer 1

您在哪个操作系统上？路径中的反斜杠表明您使用的是 Windows，并且您正在使用 open 使用其默认应用程序打开文档。但是，查看Open document with default OS application in Python, both in Windows and Mac OS 这个问题，对于 Windows，您应该使用 start 而不是 open：

subprocess.run(["start", str(destination_file)], check=True, shell=True)

您还需要添加shell=True 才能使start 工作。但是，您应该事先阅读https://docs.python.org/3/library/subprocess.html#security-considerations。

（我怀疑出现了错误 [WinError 2] The system cannot find the file specified，因为 Windows 找不到 open - 这与您尝试打开的文档无关。）