Python子流程模块-变量范围

Question

My python script have weird behavior. So, I have python script A, which calls another script B many times. For calling B, I'm using subprocess module.

Snippets of script A:

for i in range(0,10000):
    parameters = []
    parameters.append("B")
    result = subprocess.call(parameters)

Snippets of script B:

testdata = some_logic
if testdata:
    function_1()
else:
    function_2()

So, script A will calls script B many times. After some tests, I noticed that variable testdata doesn't have expected value for current running script B. Is it somehow possible in running script B, that variable testdata has value from previous call B? What is scope for variable testdata in this case? Thanks for advice. Cheers

Answer 1

subprocess.call starts a child process. That process knows nothing about what is going on in A or how many times it has been called -- All it knows is what commandline arguments you've passed to it. In this case, you're always calling 'B' with no commandline arguments since parameters always equals ['B'] when you call subprocess.call .