I have a script that I want to exit early under some condition:
if not "id" in dir():
print "id not set, cannot continue"
# exit here!
# otherwise continue with the rest of the script...
print "alright..."
[ more code ]
I run this script using execfile("foo.py") from the Python interactive prompt and I would like the script to exit going back to interactive interpreter. How do I do this? If I use sys.exit(), the Python interpreter exits completely.
In the interactive interpreter; catch SystemExit raised by sys.exit and ignore it:
try:
execfile("mymodule.py")
except SystemExit:
pass
Put your code block in a method and return from that method, like such:
def do_the_thing():
if not "id" in dir():
print "id not set, cannot continue"
return
# exit here!
# otherwise continue with the rest of the script...
print "alright..."
# [ more code ]
# Call the method
do_the_thing()
Also, unless there is a good reason to use execfile(), this method should probably be put in a module, where it can be called from another Python script by importing it:
import mymodule
mymodule.do_the_thing()
I'm a little obsessed with ipython for interactive work but check out the tutorial on shell embedding for a more robust solution than this one (which is your most direct route).
from IPython import embed and then use embed() in the place you want to stop execution and go for interactive work embed() # this call anywhere in your program will start IPython