Why is $PATH in remote deployment path different from $PATH in remote system?

I’m currently working on Pycharm with remote python Interpreter(miniconda3/bin/python).

So when I type echo $PATH in remote server, it prints /home/woosung/bin:/home/woosung/.local/bin:/home/woosung/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

I created project in Pycharm and set remote python Interpreter as miniconda3 python, it works well when I just run some *.py files.

But when I typed some os.system() lines, weird things happened.
For instance, in test.py from Pycharm project

import os

os.system('echo $PATH')
os.system('python --version')

Output is

ssh://woosung@xxx.xxx.xxx.xxx:xx/home/woosung/miniconda3/bin/python -u /tmp/pycharm_project_203/test.py
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
Python 2.7.12

Process finished with exit code 0

I tried same command in remote server,

woosung@test-pc:~$ echo $PATH
/home/woosung/bin:/home/woosung/.local/bin:/home/woosung/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
woosung@test-pc:~$ python --version
Python 3.6.6 :: Anaconda, Inc.

PATH and the version of python are totally different! How can I fix this?

I’ve already tried add os.system('export PATH="$PATH:$HOME/miniconda3/bin"') to test.py. But it still gives same $PATH.(/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games)

EDIT

Thanks to the comment of @Dietrich Epp, I successfully add interpreter path to the shell $PATH. (os.environ["PATH"] += ":/home/woosung/miniconda3/bin")
But I stuck the more basic problem. When I add the path and execute command the some *.py file including import library which is only in miniconda3, the shell gives ImportError.

For instance, in test.py

import matplotlib

os.environ["PATH"] += ":/home/woosung/miniconda3/bin"
os.system("python import_test.py")

and import_test.py

import matplotlib

And when I run test.py,

Traceback (most recent call last):
  File "import_test.py", line 1, in <module>
    import matplotlib
ImportError: No module named matplotlib

Looks like the shell doesn’t understand how to utilize modified $PATH.

Answer

I find the solution.
It is not direct but quite simple.
I changed os.system("python import_test.py") to os.system(sys.executable + ' import_test.py').

This makes the shell uses the Pycharm remote interpreter(miniconda3), not original.

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Answer