NameError:未定义名称“ftp”，Python

Question

即使我声明了ftp，我也会遇到这个错误

以下是完整的错误消息：

File "./sFTPscript.py", line 173, in <module> main()
File "./sFTPscript.py", line 167, in main uploadFTP()
File "./sFTPscript.py", line 33, in uploadFTP ftp.pwd()

NameError: name 'ftp' is not defined

--

from ftplib import FTP
import os
import sys
import kunden.config as config


def connFTP():
ftp = FTP(config.host)
ftp.login(config.username,config.password)
print("connected")

def uploadFTP():
os.chdir(config.localpath)
ftp.pwd()
ftp.cwd('test')
list_local = os.listdir(config.localpath)
for file in list_local:
    ftp.storbinary('STOR '+file, open(file,'rb'))

return list_local

def main():

    connFTP()
    uploadFTP()

if __name__ == '__main__':
    main()

在使用ftp之前，我尝试将其设置为全局变量，但仍然存在相同的错误

Answer 1

ftp在uploadFTP()的范围内是未知的。使用类、全局变量（使用global ftp）或传递对象。后者可以是：

def connFTP():
    ftp = FTP(config.host)
    ftp.login(config.username,config.password)
    print("connected")
    return ftp
    #      ^^^

def uploadFTP(ftp=None):
    os.chdir(config.localpath)
    ftp.pwd()
    ftp.cwd('test')
    list_local = os.listdir(config.localpath)
    for file in list_local:
        ftp.storbinary('STOR '+file, open(file,'rb'))
    
    return list_local

def main():

    ftp = connFTP()
    uploadFTP(ftp)
    #         ^^^

if __name__ == '__main__':
    main()

另外，您没有对从uploadFTP()（尚未？）返回的list_local执行任何操作