替换Python-PPTX上的多个子字符串

from pptx import Presentation
from pptx.util import Pt

ppt = Presentation('your_ppt_file.pptx')

for slide in ppt.slides:
    for shape in slide.shapes:
        if shape.has_text_frame:
            for paragraph in shape.text_frame.paragraphs:
                for run in paragraph.runs:
                    # 在这里进行子字符串的替换操作

run.text = run.text.replace('old_string', 'new_string')

ppt.save('modified_ppt_file.pptx')