short ways to do file I/O in python

gistfile1.txt

sys.stderr.write(open("/tmp/filename").read()) 
 
cmdline = open("/proc/cmdline").read()
 
with open("/dev/blah","r") as f:
    for l in f: # l in f means read each line
       print l
 
try:
    with open(FILENAME, 'w') as f:
         f.write(STUFF_TO_WRITE)
except Exception as e:
     log.error("Could not write to %s  because %s" % str(FILENAME, e))
     sys.exit(-1)