I am loading a cascade classifier from a file in OpenCV using python. Since the CascadeClassifier() method requires the filename to be the absolute filename, I have to load the absolute filename.
However, I am deploying and using it on Heroku and I can't seem to get the absolute path of the file. I've tried using os.getcwd() + '\cascader_file.xml', but that still does not work.
I would like to know how to load the classifier on the Heroku deployment
I figured it out. All I needed to do was use the os.path.abspath() method to convert the relative path to an absolute path
if the file you are looking for is by the side of your script, you can get the directory of the script and then locate the target resource/conf file. That's better practice than using os.getcwd since your current directory maybe not the same directory of your script.
for example, your directory is like this:
-- my_project
|-- main.py
|-- cascader_file.xml
to locate cascader_file.xml in script main.py:
d = os.path.dirname(os.path.abspath(__file__)) # your script's dir, my_project
filepath = os.path.join(d, "cascader_file.xml")
filepath = os.path.abspath(filepath) # make it an absolute path
btw, using os.path.join is more secure and more platform compatible than directly concat path parts.
