python files, move folders, copy, delete, rename

import os.path ,shutil #shutil包系统自带，无需安装

#复制单个文件
shutil.copy("C://a//1.txt","C://b")

#复制并重命名新文件
shutil.copyfile("C://a//2.txt","C://b//121.txt")

#复制整个目录(备份)
shutil.copytree("C://a","C://b//new_a")

#删除文件
os.unlink("C://b//1.txt")
os.unlink("C://b//121.txt")

#删除空文件夹
try:
    os.rmdir("C://b//new_a")
except Exception as ex:
    print("错误信息："+str(ex))#提示：错误信息，目录不是空的

#删除文件夹及内容
shutil.rmtree("C://b//new_a")

#移动文件
shutil.move("C://a//1.txt","C://b")

#移动文件夹
shutil.move("C://a//c","C://b")

#重命名文件
shutil.move("C://a//2.txt","C://a//new2.txt")

#重命名文件夹
shutil.move("C://a//d","C://a//new_d")

The multiple PDF documents into a single PDF document, there will be more than 200 delivery orders (pdf file) into one pdf document

import os
from PyPDF2 import PdfFileReader, PdfFileWriter
import shutil
path=input("输入路径")
out_path=open(r"C:\Users\DQ515RS\Desktop\需打印的快递单"+os.sep+"合并.pdf","wb")
os.chdir(path)
all_file=os.listdir(os.curdir)
f=PdfFileWriter()#若把f放到循环里边会导致只合并最后一个
for i in all_file:
    pdf_open_i=open(path+os.sep+i,"rb")
    read_pdf_i=PdfFileReader(pdf_open_i)
    n_i=read_pdf_i.getNumPages()
    for j in range(n_i):
        f.addPage(read_pdf_i.getPage(j))
f.write(out_path)
out_path.close()  #不关闭文档会出错