Message12163

Example 1: pyinfo.py[1]
---------------------
def pyinfo():
    import sys
<BLANK>
    return {"version_info": tuple(sys.version_info), "sysplatform": sys.platform}
<BLANK>
print(pyinfo())
---------------------------------

1) If you run this file like:

    jython pyinfo.py

it just runs fine, i.e.

    {'version_info': (2, 7, 1, 'final', 0), 'sysplatform': 'java1.7.0_181 ( ==linux2 for targets )'}

2) But if you feed the file into the interpreter standard input stream,

    jython < pyinfo.py

it spits out syntax error:

      File "<stdin>", line 1
        return {"version_info": tuple(sys.version_info), "sysplatform": sys.platform}
        ^
    SyntaxError: no viable alternative at input '    '

3) If you remove the first blank line, i.e.

    def pyinfo():
        import sys
        return {"version_info": tuple(sys.version_info), "sysplatform": sys.platform}
    <BLANK>
    print(pyinfo())

you can run the code by giving file name as an argument AND by feeding into standard input.

This problem prevents using a Jython interpreter in tox environment.

Testing environment
-------------------
Debian 8.11 Jessie
OpenJDK 1.7.0_181
OpenJDK Runtime Environment (IcedTea 2.6.14) (7u181-2.6.14-1~deb8u1)
OpenJDK 64-Bit Server VM (build 24.181-b01, mixed mode)
Jython 2.7.1

------
[1] tox feed this code into python interpreter's standard input