Adding an example for subprocess, another one for logging and one last for context managers.

Author: Jonathan Rocher

example_context.py

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+""" Simplest possible example of a context manager 
+"""
+
+class MyContext(object):
+    def __enter__(self):
+        print "I entered"
+        return self
+        
+    def __exit__(self, type, value, tb):
+        print "Before exiting important things to do..."
+        print("Information about potential exception: \n"
+              "type=%s, value=%s, trace=%s" % (type, value, tb))
+ 
+if __name__ == "__main__":
+    with MyContext() as c:
+        print "I am doing things"
+        raise RuntimeError("Something bad happened")
+        
+    print "Continuing normal execution"

example_logging.py

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+
+import logging
+from logging.handlers import RotatingFileHandler
+
+logger=logging.getLogger()
+
+log_file = "log.txt"
+file_handler = RotatingFileHandler(log_file, maxBytes=1024 ** 2,
+                                                backupCount=3)
+formatter = logging.Formatter("%(levelname)s - %(asctime)s - %(name)s "
+                            "- %(message)s")
+file_handler.setFormatter(formatter)
+logger.setLevel(logging.DEBUG)
+logger.addHandler(file_handler)
+
+logger.debug("test")

example_subprocess.py

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+from subprocess import Popen
+import sys
+
+print "Starting..."
+# sleep for 10 seconds
+p = Popen(['sleep','10'])
+# continue on with processing
+print "Continuing",
+k=0
+while p.poll() is None:
+  k += 1 
+  if (k % 100000) == 0: 
+      print k//100000,
+      sys.stdout.flush()
+print
+print "Done", p.returncode