当使用py.test测试该模块时，如何通过相对于Python模块的路径打开文件？

Question

I have a module inside a package which figures out the path of the invoking python program:

pathname = os.path.dirname(os.path.realpath(__file__))

from where it will pick up a mydata.json to read some parameter values.

This works fine when executing the script using python xyz.py

But the same stuff, when done using py.test at the directory, the path just points to some binary: /home/user/venv/bin/data/data.json

Basically the calling script is assumed to be py.test itself, which is located in the venv/bin .

How to overcome this problem ? I want to fetch the path of the script which in turn is being processed by py.test itself (via the module).

Answer 1

If i understand the problem correctly you should be using

import json
import os

path_to_current_file = os.path.realpath(__file__)
current_directory = os.path.split(path_to_current_file)[0]
path_to_file = os.path.join(current_directory, "mydata.json")
with open(path_to_file) as mydata:
    my_json_data = json.load(mydata)

Answer 2

Slightly different version from the one offered above:

path_to_current_file = os.path.realpath(__file__)
current_directory = os.path.dirname(path_to_current_file)
path_to_file = os.path.join(current_directory, "mydata.json")