Traceback (most recent call last): File "D:\pypdf2_problem\python_pypdf2_试验.py", line 53, in <module> MergePDF(file_dir, out_file) File "D:\pypdf2_problem\python_pypdf2_试验.py", line 29, in MergePDF pageCount = len(input.pages) ^^^^^^^^^^^^^^^^ File "D:\python下载\Lib\site-packages\PyPDF2\_page.py", line 2063, in __len__ return self.length_function() ^^^^^^^^^^^^^^^^^^^^^^ File "D:\python下载\Lib\site-packages\PyPDF2\_reader.py", line 445, in _get_num_pages return self.trailer[TK.ROOT]["/Pages"]["/Count"] # type: ignore ~~~~~~~~~~~~^^^^^^^^^ File "D:\python下载\Lib\site-packages\PyPDF2\generic\_data_structures.py", line 266, in __getitem__ return dict.__getitem__(self, key).get_object() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\python下载\Lib\site-packages\PyPDF2\generic\_base.py", line 259, in get_object obj = self.pdf.get_object(self) ^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\python下载\Lib\site-packages\PyPDF2\_reader.py", line 1266, in get_object raise FileNotDecryptedError("File has not been decrypted") PyPDF2.errors.FileNotDecryptedError: File has not been decrypted

这个错误是由PyPDF2库引发的，它表示PDF文件尚未解密。在使用PyPDF2库处理PDF文件之前，你需要确保文件已经被正确解密。你可以尝试使用相关的解密方法来解决这个问题。你可以参考以下示例代码：

from PyPDF2 import PdfFileReader

def decrypt_pdf(file_path, password):
    with open(file_path, 'rb') as file:
        pdf = PdfFileReader(file)
        if pdf.isEncrypted:
            pdf.decrypt(password)
        return pdf

def merge_pdf(file_dir, out_file):
    merged_pdf = PdfFileWriter()
    for file_name in os.listdir(file_dir):
        file_path = os.path.join(file_dir, file_name)
        pdf = decrypt_pdf(file_path, password)  # 解密PDF文件
        for page_num in range(pdf.getNumPages()):
            page = pdf.getPage(page_num)
            merged_pdf.addPage(page)
    with open(out_file, 'wb') as output:
        merged_pdf.write(output)

# 调用函数进行合并
file_dir = 'path/to/pdf/files/directory'
out_file = 'path/to/output/merged.pdf'
password = 'your_password'
merge_pdf(file_dir, out_file)

请将代码中的`file_dir`替换为包含要合并的PDF文件的目录路径，将`out_file`替换为合并后的PDF文件的输出路径，将`password`替换为加密PDF文件的密码（如果有加密）。如果文件已经解密，则不需要提供密码。

希望这能帮到你！