Question

是否可以将subprocess.Popen（）的返回值保存或存储到全局变量中？例如，

global_var = none
 ...
 def some_function():
    p = subprocess.Popen(...,stdout=subprocess.PIPE, shell=True)
    global_var = p

 def some_function_2():
    x = global_var.stdout

像这样的东西。我本质上是尝试从先前在代码中启动的子进程中读取输出，但我需要稍后开始读取。

Answer 1

所以这最终成了一个愚蠢的疏忽。我需要做的就是调用global和函数内的全局变量名来正确设置它的值，如下所示：

global_var = none
 ...
 def some_function():
    p = subprocess.Popen(...,stdout=subprocess.PIPE, shell=True)
    global global_var
    global_var = p

 def some_function_2():
    x = global_var.stdout

Answer 2

您需要在some_function添加一行。我也提供了更好的解决方案。

 global_var = None  
 ...
 def some_function():
    global global_var # without this line, Python will create a local named global_variable
    p = subprocess.Popen(...,stdout=subprocess.PIPE, shell=True)
    global_var = p

 def some_function_2():
    x = global_var.stdout

更好的是：

 def some_function():
    # I assume this function does some other things, otherwise
    # you don't need to write a function to just call another.
    p = subprocess.Popen(...,stdout=subprocess.PIPE, shell=
    return p

 my_process = some_function()

 def some_function_2():
    x = my_process.stdout

将subprocess.Popen的返回值保存为全局变量

2 个答案: