import os

folder_path = os.getcwd()
n = len(os.listdir(folder_path))
i = 0
replaced = 0

for filename in os.listdir(folder_path):
    if "_2F" in filename:
        replaced += 1
        os.rename(
            os.path.join(folder_path, filename), 
            os.path.join(folder_path, filename.replace("_2F", "%"))
        )

    i += 1
    print(f'\rChecked: {100*i/n:.2f}%', end='', flush=True)
print(f'\nReplaced filenames: {replaced}')