Python – jython syntaxerror

jythonpython

I got the following syntax error at the following line when I run my program in jython:

except Exception as detail:

SyntaxError: mismatched input 'as' expecting COLON

but on python is it ok? What is wrong? I am trying to use the stanford pos tagger api (java) in my python program. Are there other ways?

Best Answer

There are 2 current versions of Jython: the 2.5 version is the stable one, and 2.7 is a release candidate. The as syntax for except appeared in CPython 2.6 and thus will be supported in Jython 2.7; I guess you're using Jython 2.5,

You can use the older (Python 3 incompatible) except syntax in Jython 2.5:

except Exception, detail:

Related Solutions

Python – Why is Python running the module when I import it, and how to stop it

Because this is just how Python works - keywords such as class and def are not declarations. Instead, they are real live statements which are executed. If they were not executed your module would be .. empty :-)

Anyway, the idiomatic approach is:

# stuff to run always here such as class/def
def main():
    pass

if __name__ == "__main__":
   # stuff only to run when not called via 'import' here
   main()

See What is if __name__ == "__main__" for?

It does require source control over the module being imported, however.

Jython – SyntaxError: mismatched input ‘,’ expecting COLON

It works in Python 2.7 and 3. It does not work in pre-2.7, which is what Jython (at least the current release, I vaguely recall 2.7 compatibility being worked on) supports. There is no set literal syntax in those versions. Use what you'd use on pre-2.7 CPython too: set([item1, item2, ...])

Best Answer

Related Solutions

Python – Why is Python running the module when I import it, and how to stop it

Jython – SyntaxError: mismatched input ‘,’ expecting COLON

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