如何在macOS中使用Python对PDF文件进行简单编辑

介绍如何在macOS中使用Python对PDF文件进行简单编辑，包括添加水印、页码、删除页面等。

'''
from PyPDF2 import PdfFileMerger, PdfFileReader, PdfFileWriter

# 合并PDF文件
def merge_pdf(input_paths, output_path):
    pdf_merger = PdfFileMerger()
    for path in input_paths:
        pdf_merger.append(path)
    with open(output_path, 'wb') as fileobj:
        pdf_merger.write(fileobj)

# 添加水印
def add_watermark(input_path, output_path, watermark_path):
    watermark = PdfFileReader(watermark_path)
    watermark_page = watermark.getPage(0)

    pdf = PdfFileReader(input_path)
    pdf_writer = PdfFileWriter()

    for page in range(pdf.getNumPages()):
        page = pdf.getPage(page)
        page.mergePage(watermark_page)
        pdf_writer.addPage(page)

    with open(output_path, 'wb') as fileobj:
        pdf_writer.write(fileobj)

# 添加页码
def add_page_number(input_path, output_path):
    pdf_reader = PdfFileReader(input_path)
    pdf_writer = PdfFileWriter()

    for page in range(pdf_reader.getNumPages()):
        pdf_page = pdf_reader.getPage(page)
        pdf_page.mergePage(watermark_page)
        pdf_writer.addPage(pdf_page)

        text = 'Page {}/{}'.format(page+1, pdf_reader.getNumPages())
        pdf_canvas = pdf_writer.getPage(page).canvas
        pdf_canvas.drawString(530, 15, text)

    with open(output_path, 'wb') as fileobj:
        pdf_writer.write(fileobj)

# 删除页面
def delete_page(input_path, output_path, page_number):
    pdf_reader = PdfFileReader(input_path)
    pdf_writer = PdfFileWriter()

    for page in range(pdf_reader.getNumPages()):
        if page != page_number:
            pdf_page = pdf_reader.getPage(page)
            pdf_writer.addPage(pdf_page)

    with open(output_path, 'wb') as fileobj:
        pdf_writer.write(fileobj)

if __name__ == '__main__':
    merge_pdf(['file1.pdf', 'file2.pdf'], 'output.pdf')
    add_watermark('input.pdf', 'output.pdf', 'watermark.pdf')
    add_page_number('input.pdf', 'output.pdf')
    delete_page('input.pdf', 'output.pdf', 2)
'''

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