Python 如何使用pyPdf反转pdf文件中的页面顺序？

我有一个pdf文件“myFile.pdf”。我想反转它的页面顺序使用。如何操作？

自2019年1月（很久以前）起不再更新，并且在测试时与（至少）Python 3.6不兼容，很可能与Python 3完全不兼容：

In [1]: import pyPdf
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-bba5a42e9137> in <module>
----> 1 import pyPdf

c:\temp\envminecart\lib\site-packages\pyPdf\__init__.py in <module>
----> 1 from pdf import PdfFileReader, PdfFileWriter
      2 __all__ = ["pdf"]

ModuleNotFoundError: No module named 'pdf'

我还建议采用更具python风格的方法，直接使用以下命令在页面上进行迭代：

---

我不知道这个

.pages

集合是否在原始的

pyPdf

中可用，但可以说在这一点上它并不重要。

感谢分享建议。在选择和保存文件时，我使用了它们并进行了一些编辑，以使界面更加图形化。所有这些都是新的，我添加的内容可能没有效率或干净，但它对我有用，我想与大家分享

from PyPDF2 import PdfFileWriter, PdfFileReader
import tkinter as tk
from tkinter import filedialog
import ntpath
import os


output_pdf = PdfFileWriter()

# grab the location of the file path sent
def path_leaf(path):
    head, tail = ntpath.split(path)
    return head

# graphical file selection
def grab_file_path():
    # use dialog to select file
    file_dialog_window = tk.Tk()
    file_dialog_window.withdraw()  # hides the tk.TK() window
    # use dialog to select file
    grabbed_file_path = filedialog.askopenfilename()
    return grabbed_file_path


# file to be reversed
filePath = grab_file_path()

# open file and read
with open(filePath, 'rb') as readfile:
    input_pdf = PdfFileReader(readfile)

    # reverse order one page at time
    for page in reversed(input_pdf.pages):
        output_pdf.addPage(page)

    # graphical way to get where to select file starting at input file location
    dirOfFileToBeSaved = path_leaf(filePath)
    locationOfFileToBeSaved=filedialog.asksaveasfilename(initialdir=dirOfFileToBeSaved, initialfile='name of reversed file.pdf',title="Select or type file name and location", filetypes=[("pdf files", "*.pdf")])
    # write the file created
    with open(locationOfFileToBeSaved, "wb") as writefile:
        output_pdf.write(writefile)

# open the file when done
os.startfile(locationOfFileToBeSaved)

---

@汤姆：到目前为止，我试过的方法和诺斯洛的答案有点类似。我们都有相同的错误（对关闭的文件进行I/O操作）。原因当然是我们在关闭它之后都使用了

output\u pdf

。我刚刚修复了他的解决方案。感谢这一点，它帮助我识别了导致对已关闭文件执行I/O操作的错误：您必须保持PdfileReader打开，直到PdfileWriter完成编写。（与我的直觉相反）。这大概是因为作者在需要时才从读者的页面中查找数据，以提高性能。

from PyPDF2 import PdfFileWriter, PdfFileReader
output_pdf = PdfFileWriter()

with open(r'input.pdf', 'rb') as readfile:
    input_pdf = PdfFileReader(readfile)
    total_pages = input_pdf.getNumPages()
    for page in range(total_pages - 1, -1, -1):
        output_pdf.addPage(input_pdf.getPage(page))
    with open(r'output.pdf', "wb") as writefile:
        output_pdf.write(writefile)

from PyPDF2 import PdfFileWriter, PdfFileReader

output_pdf = PdfFileWriter()

with open('input.pdf', 'rb') as readfile:
    input_pdf = PdfFileReader(readfile)

    for page in reversed(input_pdf.pages):
        output_pdf.addPage(page)

    with open('output.pdf', "wb") as writefile:
        output_pdf.write(writefile)

from PyPDF2 import PdfFileWriter, PdfFileReader
import tkinter as tk
from tkinter import filedialog
import ntpath
import os


output_pdf = PdfFileWriter()

# grab the location of the file path sent
def path_leaf(path):
    head, tail = ntpath.split(path)
    return head

# graphical file selection
def grab_file_path():
    # use dialog to select file
    file_dialog_window = tk.Tk()
    file_dialog_window.withdraw()  # hides the tk.TK() window
    # use dialog to select file
    grabbed_file_path = filedialog.askopenfilename()
    return grabbed_file_path


# file to be reversed
filePath = grab_file_path()

# open file and read
with open(filePath, 'rb') as readfile:
    input_pdf = PdfFileReader(readfile)

    # reverse order one page at time
    for page in reversed(input_pdf.pages):
        output_pdf.addPage(page)

    # graphical way to get where to select file starting at input file location
    dirOfFileToBeSaved = path_leaf(filePath)
    locationOfFileToBeSaved=filedialog.asksaveasfilename(initialdir=dirOfFileToBeSaved, initialfile='name of reversed file.pdf',title="Select or type file name and location", filetypes=[("pdf files", "*.pdf")])
    # write the file created
    with open(locationOfFileToBeSaved, "wb") as writefile:
        output_pdf.write(writefile)

# open the file when done
os.startfile(locationOfFileToBeSaved)