add 'Run Command: subprocess' recipe.

README.md

@@ -128,6 +128,10 @@
 - [TCP Server](https://lucas-six.github.io/python-cookbook/cookbook/core/asyncio/tcp_server) ([Low-Level APIs](https://lucas-six.github.io/python-cookbook/cookbook/core/asyncio/tcp_server_low))
 - [TCP Client](https://lucas-six.github.io/python-cookbook/cookbook/core/asyncio/tcp_client) ([Low-Level APIs](https://lucas-six.github.io/python-cookbook/cookbook/core/asyncio/tcp_client_low))
 
+### System
+
+- [Run Command: `subprocess`](https://lucas-six.github.io/python-cookbook/cookbook/core/system/subprocess)
+
 ## Build (构建)
 
 ### Command-Line Arguments Parser

cookbook/core/system/subprocess.md

@@ -0,0 +1,26 @@
+# Run command: `subprocess`
+
+## Recipes
+
+```python
+import subprocess
+
+
+try:
+    p = subprocess.run(['ls', '-l'],
+                       check=True,
+                       timeout=1.0,
+                       capture_output=True,
+                       text=True,
+                       encoding='utf-8',
+                       errors='strict')
+except subproess.TimeoutExpired:
+    logging.error('timeout')
+except CalledProcessError:
+    logging.error('run failed')
+isinstance(p.stdout, str)
+```
+
+## References
+
+- [Python - `subprocess` module](https://docs.python.org/3/library/subprocess.html)