How can I let iwyu iterates on a bunch of cpp&h files

Question

So far, I have managed to operate iwyu on a single cpp file using the following command:

$ include-what-you-use $CXXFLAGS test.cpp

However, now I want to perform analysis on my project. I have written a script in python that selects all cpp and h files in my project:

import os
import shutil

def findF(path, list):
    for files in os.listdir(path):
        tmpPath = os.path.join(path, files)
        if os.path.isdir(tmpPath): #recurse the function if the path is a directory
            findF(tmpPath, list)
        elif os.path.isfile(tmpPath): # find the cpp and h file
            if tmpPath.endswith('.cpp')|tmpPath.endswith('.h'):
                list.append(files)
                #print("cpp file & h file: " + files)

t = []
findF('E:\intern\mrtrix3', t)
print(t)

Now this script will return a list that contains a bunch of file names, for example t=['test1.cpp', 'test2.cpp', 'test3.cpp'.....'test99.cpp']

I wonder how can I apply such list to iwyu so that iwyu can iterates these files, and perform analysis?

I hope my inquiry makes sense. Thank you!