Short answer: if you don't know stuff like this, then you probably
shouldn't mess around with the builtins in production code.
Depending on your operating system, there are probably programs that let
you list all of the files that have been opened on your system. For
example, on OS X, lsof(1) does the trick.
Playing with this a little:
----< logopen.py >---------------------------------------
import sys, time
class OpenLogger(object):
def __init__(self, logfile=sys.stdout):
self.logfile = logfile
self.old_open = __builtins__.open
def open(self, path, *mode):
openargs = ', '.join(map(repr, mode and [path, mode[0]] or [path]))
tt = time.time()
thdr = '%s.%02d' % (time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(tt)), int(tt*100)%100)
print >> self.logfile, '%s: open(%s) called from %r in "%s" line %s' % ((thdr, openargs) +
[(f.f_code.co_name, f.f_code.co_filename, f.f_lineno) for f in [sys._getframe(1)]][0])
return self.old_open(path, *mode)
def on(self):
__builtins__.open = self.open
def off(self):
__builtins__.open = self.old_open
def main(*logfile):
logger = OpenLogger(*logfile)
try:
logger.on()
script_to_monitor = sys.argv[1]
sys.argv[0:] = sys.argv[1:]
xdict = dict(__builtins__=__builtins__, __name__='__main__')
execfile(script_to_monitor, xdict)
finally:
logger.off()
if __name__ == '__main__':
if not sys.argv[2:]: raise SystemExit, """
Usage: [python] logopen.py [-log logfile] script_to_monitor [script_to_monitor args]"""
logfile = sys.argv[1] == '-log' and sys.argv.pop(1) and [open(sys.argv.pop(1), 'a')] or []
main(*logfile)
---------------------------------------------------------
A script whose opens we can monitor, that opens a file from module and function scope:
----< pnlines.py >---------------------------------------
import sys
print '----< %r' % sys.argv[1]
for i, line in enumerate(open(sys.argv[1], 'r')):
print '%4s: %s' %(i+1, line.rstrip())
def foo(nlines=1):
for i, line in enumerate(open(sys.argv[1])): # test default 'r'
print '%4s: %s' %(i+1, line.rstrip())
if i+1 >= nlines: break
print '----< 3 lines of %r' % sys.argv[1]
foo(3)
---------------------------------------------------------
Result (tested only as as far as you see here):
[ 0:23] C:\pywk\clp>del logopen.txt
Could Not Find C:\pywk\clp\logopen.txt
[ 0:23] C:\pywk\clp>py24 logopen.py
Usage: [python] logopen.py [-log logfile] script_to_monitor [script_to_monitor args]
Ok, so we pass pnlines.py as the file for it itself to print:
[ 0:23] C:\pywk\clp>py24 logopen.py -log logopen.txt pnlines.py pnlines.py
----< 'pnlines.py'
1: import sys
2: print '----< %r' % sys.argv[1]
3: for i, line in enumerate(open(sys.argv[1], 'r')):
4: print '%4s: %s' %(i+1, line.rstrip())
5:
6: def foo(nlines=1):
7: for i, line in enumerate(open(sys.argv[1])): # test default 'r'
8: print '%4s: %s' %(i+1, line.rstrip())
9: if i+1 >= nlines: break
10: print '----< 3 lines of %r' % sys.argv[1]
11: foo(3)
12:
----< 3 lines of 'pnlines.py'
1: import sys
2: print '----< %r' % sys.argv[1]
3: for i, line in enumerate(open(sys.argv[1], 'r')):
[ 0:24] C:\pywk\clp>type logopen.txt
2005-05-15 00:24:06.55: open('pnlines.py', 'r') called from '?' in "pnlines.py" line 3
2005-05-15 00:24:06.55: open('pnlines.py') called from 'foo' in "pnlines.py" line 7
Maybe the OP can build on this and contribute back something more useful and tested ;-)
Regards,
Bengt Richter
