python - 在另一个只有 main 方法的模块中创建实例无缘无故地失败

Question

我有两个模块，一个被称为tnspingexecutor.py主要是我正在调用以 ping Oracle 实例的子进程，另一个被称为principal.py只有主方法。的代码tnspingexecutor.py：

import sys
import os
import re
from subprocess import Popen, PIPE

class TnsPingExecutor:

    def __init__(self, instance):
        self.instance = instance


    def tnsping(self):
        # Creating Command String.  Example : "tnsping data-source-name"
        command_string = "tnsping {d}".format(d=self.instance)

        command = command_string.split() # Converts tnsping command list

        process = Popen(command, stdout=PIPE, stderr=PIPE) # Trigger Command
 
        self.stdout, self.stderr = process.communicate() # Stores stdout and stderr of command execution

        # Stores tnsping exit code.
        # Code will be 0 if tnsping succeeds.
        self.status_code = process.returncode
        
        return self.status_code, self.stdout, self.stderr

if __name__ == "__main__":
        # Command line input for data source name to be checked
    data_source_name = "ABCD01" #sys.argv[1]

    tnspingsource = TnsPingExecutor(data_source_name)
        
    tnspingsource.tnsping()
        
        # Print TNSPING Command Execution Output
    if tnspingsource.status_code == 0:
        
        print("It worked! Yeah!")
    else:
        print("TNSPING ",data_source_name," has failed !")

当我运行python3 tnspingexecutor.py它执行没有任何问题 tnspingsource.status_code = 0。

当我评论时：

'''
if __name__ == "__main__":
        # Command line input for data source name to be checked
    data_source_name = "ABCD01" #sys.argv[1]

    tnspingsource = TnsPingExecutor(data_source_name)
        
    tnspingsource.tnsping()
        
        # Print TNSPING Command Execution Output
    if tnspingsource.status_code == 0:
        
        print("It worked! Yeah!")
    else:
        print("TNSPING ",data_source_name," has failed !")
'''

然后，在principal.py模块中：

import sys
import os
from tnspingexecutor import TnsPingExecutor


def main():

    
    data_source_name = "ABCD01"
    tnspingsource = TnsPingExecutor(data_source_name)  #constructor
    tnspingsource.tnsping()
    if tnspingsource.status_code == 0 :
          print("ping succed")
          exit(1)
    else:
          print("ping did not succed")
          exit(1)
    

if __name__ == "__main__":
  main()

现在，当我运行python3 principal.py它不起作用tnspingsource.status_code = 1而不是0

我究竟做错了什么 ？