Reload function usage in Python 3.3.2

Question

I read a lot on reload but I am not able to use reload function.There is some error in imp.py itself.I didn't make any changes.

>>> import imp
>>> imp.reload('fileread')
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    imp.reload('fileread')
  File "C:\Python33\lib\imp.py", line 258, in reload
    raise TypeError("reload() argument must be module")
TypeError: reload() argument must be module

fileread is stored in proper directory of python.

Martijn Pieters · Accepted Answer · 2013-10-24 17:24:49Z

3

You need to pass actual module objects to imp.reload().

If you only have the module name, look up the module object in the sys.modules mapping:

import sys
import imp

imp.reload(sys.modules['fileread'])

This only works on modules that have already been imported; if some of your entries are not imported yet, at the very least catch the KeyError skip these:

try:
    imp.reload(sys.modules[modulename])
except KeyError:
    # not loaded, no point in reloading
    pass

Optionally, you could use importlib.import_module() to load such modules instead.

edited Oct 24, 2013 at 17:24

answered Oct 24, 2013 at 17:00

Martijn Pieters

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2 Comments

tcp Over a year ago

>>> import sys >>> import imp >>> imp.reload(sys.modules['fileread']) Traceback (most recent call last): File "<pyshell#2>", line 1, in <module> imp.reload(sys.modules['fileread']) KeyError: 'fileread' I am still getting error

Martijn Pieters Over a year ago

@PavanRavishankar: Then the module is not imported. Import fileread first; at that point there is no need to reload either.

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