Python脚本:shebang行(unix)问题 [英] Python script: problems with shebang line (unix)

问题描述

我正在尝试通过向本地服务器启动测试应用程序来体验Flask微框架.尝试运行我的代码 app.py 时，我不断收到错误消息:

I am trying to get a feel for the Flask microframework by launching a test application to local server. When trying to run my code, app.py, I keep getting the error message:

-bash: ./app.py: /flask/bin/python: bad interpreter: No such file or directory

这是基本代码(摘自此处)表示 app.py ，该代码位于我的todo-api目录中:

Here is the basic code (taken from here) for app.py, which lives in my todo-api directory:

#!/flask/bin/python
from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
    return "Hello, World!"

if __name__ == '__main__':
    app.run(debug=True)

我已经检查了python解释器的文件路径，它应该存在:

I've checked the file path to the python interpreter, and it should exist:

:bin $ pwd python

Users/me/Documents/Python/todo-api/flask/bin

我已经按照教程学习了T；我尝试将shebang行更改为:

I have followed the tutorial to the T; I've tried changing the shebang line to:

#!/flask/bin/python2.x
#!flask/bin/python
#!/flask/bin/env python

但无济于事.我对bash并不了解，并且尝试查找正在发生的事情，但是对有类似问题的人的解决方案对我来说并不奏效；幕后有什么我不了解的事情吗?

But to no avail. I am not that knowledgeable about bash, and have tried looking up what is going on, but the solutions to folks with similar problems have not worked for me; is there something going on behind the scenes that I am not understanding?

推荐答案

Bash shebang期望到达解释器的绝对路径.因此，在您的情况下，您需要指定Python解释器的完整路径，即:

Bash shebangs expect an absolute path to the interpreter. So in your case you need to specify the full path to your Python interpreter i.e.:

#!/Users/me/Documents/Python/todo-api/flask/bin

您可能想研究/usr/bin/env python 的使用，以便能够使用用户的 $ PATH 环境变量中可用的解释器.参见 https://unix.stackexchange.com/questions/12736/how-does-usr-bin-env-know-which-program-to-use/12751#12751

You might want to investigate the use of /usr/bin/env python to be able to use the interpreter that is available in your user's $PATH environment variable. See https://unix.stackexchange.com/questions/12736/how-does-usr-bin-env-know-which-program-to-use/12751#12751

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