[Python] Why does `subprocess.Popen` return a `proc.returncode` of 0 (success) even when an...

error:

make[2]: *** [live_module/test/CMakeFiles/live_report_unittest.dir/live_report_unittest.cc.o] 错误 1
make[1]: *** [live_module/test/CMakeFiles/live_report_unittest.dir/all] 错误 2
make: *** [all] 错误 2
live_module/test/live_report_unittest.cc:183:2: 错误：no matching function for call to ‘EasyMock::Mocke


code:

proc = subprocess.Popen(
cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
returncode = proc.returncode


For the error above, why does executing the code below result in a return code of 0 (success) when I expect it to report an error? What is the reason for this, and how can I resolve the issue?

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