I'm writing a simple modelling environment that provides a GUI for
dynamically coupling fortran and C subroutines to solve a science
problem. The GUI and environment glue are all python. One thing I
want to do is allow the user to load a python file that provides the
user defined details on how the C/Fortran modules are to be coupled
in the science model ... basically a script file if you like. They
use the GUI to select and run the python file. I have no control over
whether/when the user edits the python script and wants to rerun the
script without restarting the environment so I need to be able to
(repeatedly) reload the current script at any time
I'm having problems with import and reload. Here is a simple test
code (mytest.py) that runs from the python prompt that shows the
problem, and the log of my session from the python command line.
In the real code the variable 'model' is passed into load() ... I've
just set it here to make the code self contained. At the first load()
the version in siberia900.py is set to 1.00. Between the first and
second load() I edit siberia900.py so that version is 0.00 (just an
easy way to see if the modified code is reloaded). Clearly the reload
fails (and if I don't have the try/except ... that is the commented
line is executed ... it crashes with the error 'NameError: name
'siberia900' is not defined'). Also clearly reloading mytest also
doesn't change anything.
Now all this runs fine (i.e. the correct version numbers are output)
at the python interpretter line so its clearly something to do with
it being inside the module mytest which I don't understand. Finally
if I uncomment the bottom two lines and run it at the unix command
line as 'python mytest.py' it still fails in the same way (i.e. the
'except' line is executed).
Can anyone please explain what's going on ... and how I might be able
to do what I need to do.
------------------------------------
current_model_name=''
def load():
global current_model_name
model='siberia900'
text1='import '+model
text2='reload('+model+')'
if model==current_model_name:
try:
exec(text2)
print 'here 2',text2
except:
print 'here 3',text1
exec(text1)
# exec(text2)
else:
print 'here 10', text1
exec(text1)
current_model_name=model
return(siberia900.version)
#load()
#load()
----------------------------------------
-----------------------------------------
>>> import mytest
>>> mytest.load()
here 10 import siberia900
'1.00'
>>> mytest.load()
here 3 import siberia900
'1.00'
>>> reload(mytest)
<module 'mytest' from 'mytest.pyc'>
>>> mytest.load()
here 10 import siberia900
'1.00'
-----------------------------------------
====================================================================
Prof Garry Willgoose,
Australian Professorial Fellow in Environmental Engineering,
Director, Centre for Climate Impact Management (C2IM),
School of Engineering, The University of Newcastle,
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