pdf合并（python）

工具代码，背景是某门课的ppt章节分类得过于详细，比如1.01，然后一份pdf文件只有几页，故借助PyPDF2进行pdf文件合并。

import os
import copy
from PyPDF2 import PdfMerger

target_path = 'D:\\study\\大四上\\生物信息\\ppt'
pdf_lst = [f for f in os.listdir(target_path) if f.endswith('.pdf')]

classified_lst = []
t = []
prefix = None
for filename in pdf_lst:
    if not filename[0].isdigit():
        continue
    if prefix is None or filename[0] == prefix:
        prefix = filename[0]
    else:
        prefix = filename[0]
        classified_lst.append(copy.deepcopy(t))     # 深浅拷贝问题
        t.clear()
    t.append(filename)
classified_lst.append(t)

fclassified_lst = []
for x in classified_lst:
    t = []
    for y in x:
        t.append(os.path.join(target_path, y))
    fclassified_lst.append(t)

# 将相同的章节合并到一个pdf中
num = 1
file_merger = PdfMerger()
for chapter in fclassified_lst:
    for pdf in chapter:
        file_merger.append(pdf)
    file_merger.write(target_path + "\\sum\\chapter" + str(num) + ".pdf")
    num += 1
    file_merger = PdfMerger()

print("done!")