没看懂，重新组织下语言。你为什么需要开新的 cmd 窗口?

a.py
```python
import subprocess
from subprocess import Popen, PIPE, STDOUT

if __name__ == '__main__':
for i in range(1,4):
cmd = "python b.py " + str(i)
with Popen(cmd, shell=True, stdout=PIPE, stderr=STDOUT) as res:
out = res.stdout.read()
out = bytes.decode(out,encoding = "utf-8")
print(out)

```

b.py
```python
import sys

if __name__ == '__main__':
print(sys.argv[1])
```