setting environment variable in Python from bash wrapper

I am trying to run Python script through a wrapper script which sets path to different directories and handle log file & script execution.

While running shell scripts through this wrapper we assign the paths by using ${temp_data_path} in the ksh&bash scripts ,so now I want the same path but in my python script.

I am trying below,as I believe i have to set environment variable first by reading the value set for temp_data_path by my wrapper:

os.environ[temp_data_path] = ??not sure how I can assign the value from wrapper here

print os.environ[temp_data_path]