Replace text

main.py

import os

path = ""
fileType = ".xml"

dictionary = {
    "oldvalue": "newvalue",
}

modified = False

for dname, dirs, files in os.walk(os.path.normpath(path)):
    for fname in files:
        fpath = os.path.join(dname, fname)
        if fpath.endswith(fileType) == True:
            with open(fpath, "r", encoding="ISO-8859-1") as f:
                s = f.read()
            for key in dictionary:
                if key in s:
                    s = s.replace(key, dictionary[key])
                    modified = True
            if modified:
                with open(fpath, "w", encoding="ISO-8859-1") as f:
                    f.write(s)
                    modified = False
            else:
                print(f"{fpath} was not modified.")