Python如何实现PDF编辑器

通过PyPDF4模块，实现Parse Text、Remove pages 等常用功能。具体实现如下：

# PDF Editor
# pip install PyPDf4

import PyPDF4

# Parse the Text from PDF
def parse_text(pdf_file):
    reader = PyPDF4.PdfFileReader(pdf_file)
    for page in reader.pages:
        print(page.extractText())
        
# Remove Page from PDF
def remove_page(pdf_file, page_numbers):
    filer = PyPDF4.PdfReader('source.pdf', 'rb')
    out = PyPDF4.PdfWriter()
    for index in page_numbers:
        page = filer.pages[index] 
        out.add_page(page)
with open('rm.pdf', 'wb') as f:
        out.write(f)
        
# Add Blank Page to PDF
def add_page(pdf_file, page_number):
    reader = PyPDF4.PdfFileReader(pdf_file)
    writer = PyPDF4.PdfWriter()
    writer.addPage()
    with open('add.pdf', 'wb') as f:
        writer.write(f)
        
# Rotate Pages
def rotate_page(pdf_file):
    reader = PyPDF4.PdfFileReader(pdf_file)
    writer = PyPDF4.PdfWriter()
    for page in reader.pages:
        page.rotateClockwise(90)
        writer.addPage(page)
    with open('rotate.pdf', 'wb') as f:
        writer.write(f)
        
# Merge PDFs
def merge_pdfs(pdf_file1, pdf_file2):
    pdf1 = PyPDF4.PdfFileReader(pdf_file1)
    pdf2 = PyPDF4.PdfFileReader(pdf_file2)
    writer = PyPDF4.PdfWriter()
    for page in pdf1.pages:
        writer.addPage(page)
    for page in pdf2.pages:
        writer.addPage(page)
    with open('merge.pdf', 'wb') as f:
        writer.write(f)