如何使用python gnupg加密数据而不设置收件人

我正在使用python gnupg在本地对称加密文件（因此不会发送给任何人）。
问题是：当收件人设置为

None

时，会出现以下错误

Traceback (most recent call last):
  File "/home/michelojordan/Documents/project_file/gpg_cryptography.py", line 32, in <module>
    file_encryption("lkdzmmza6532adz")
  File "/home/michelojordan/Documents/project_file/gpg_cryptography.py", line 8, in file_encryption
    enc_data = gpg.encrypt(data, recipients=None, symmetric=True, passphrase=encryption_key)
  File "/home/michelojordan/.local/lib/python3.9/site-packages/gnupg/gnupg.py", line 1064, in encrypt
    result = self._encrypt(stream, recipients, **kwargs)
TypeError: _encrypt() got multiple values for argument 'recipients'

Python gnupg版本是0.4.7
Python版本是3.9.2
系统：kali linux 5.10.0

---

我已经被困了3周了，所以非常感谢您的帮助。

奇怪的是，我没有在Python gnupg 0.4.7中找到回溯中的代码。进一步查看，我发现了一些具有类似名称的不同库。你有可能把他们弄糊涂了吗？

import gnupg, os
def file_encryption(encryption_key):
    gpg = gnupg.GPG()
    with open("data_file.csv", "rb") as data_file:
        data = data_file.read()
        enc_data = gpg.encrypt(data, recipients=None, symmetric=True, passphrase=encryption_key)
        
    with open("enc_file.txt", "wb") as enc_file:
        enc_file.write(enc_data.data)

    os.remove("data_file.csv")
    

def file_decryption(decryption_key):
    gpg = gnupg.GPG()  
    with open("enc_file.txt", "rb") as enc_file:
        read_data = enc_file.read()
        dec_data = gpg.decrypt(read_data, passphrase=decryption_key)
        
    with open("data_file.csv", 'a+') as dec_file:
        dec_file.write(dec_data.data.decode())


with open("data_file.csv", "a+") as file:
    file.write('message to encrypt')

file_encryption("passcode")