Fix python3 parse error

[MR-BH]

fix case like:

print(0)
print(1)

cause error
Parse error: {
startLine: 2,
endLine: 2,
startCol: 8,
endCol: 13,
message: "no viable alternative at input ''"
}

[kaby76]

@MR-BH The Python3 target of the python/python3 grammar sometimes takes over 300s on a heavily loaded Github server, so the parse was killed. The test will need to be split or changed to individual parsing. For now, remove the target in the desc.xml.

grammars-v4/python/python3/desc.xml

Line 4 in 6e70406

<targets>CSharp;Java;Python3</targets>

Or, if you want to help fix this, change the desc.xml to this:

<?xml version="1.0" encoding="UTF-8" ?>
<desc xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../_scripts/desc.xsd">
   <antlr-version>^4.7</antlr-version>
   <targets>CSharp;Java;Python3</targets>
   <test>
      <targets>CSharp;Java;Python3</targets>
      <inputs>examples</inputs>
   </test>
   <test>
      <targets>CSharp;Java;Python3</targets>
      <inputs>long-examples</inputs>
   </test>
</desc>

Then, make a "long-examples" directory, and move these four .py tests to long-examples/:

mkdir long-examples
mv examples/base_events.py long-examples/
mv examples/selector_events.py long-examples/
mv examples/unix_events.py long-examples/
mv examples/windows_events.py long-examples/

[KvanTTT]

Welcome to ANTLR grammars repository!

But please add an example that covers suggested changes to the examples subdirectory.

[kaby76]

I restructured the python grammars, and restructured the tests in python3. Please update to the latest source and try again. Thanks.