Seen on REL1_30 and REL1_29. Seems fine on REL1_31 and master
https://gerrit.wikimedia.org/r/440866
https://gerrit.wikimedia.org/r/440865
```
14:04:37 1) ParserIntegrationTest::testParse with data set "parserTests.txt: Default behaviour (inner is pre)" ('[details omitted]')
14:04:37 Failed to invoke Pygments: /usr/bin/env: python: No such file or directory
14:04:37 [Called from SyntaxHighlight::highlight in /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php at line 314]
14:04:37
14:04:37 /workspace/src/includes/debug/MWDebug.php:309
14:04:37 /workspace/src/includes/debug/MWDebug.php:164
14:04:37 /workspace/src/includes/GlobalFunctions.php:1192
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:314
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:121
14:04:37 /workspace/src/includes/parser/Parser.php:3852
14:04:37 /workspace/src/includes/parser/Preprocessor_Hash.php:1145
14:04:37 /workspace/src/includes/parser/Parser.php:2921
14:04:37 /workspace/src/includes/parser/Parser.php:1277
14:04:37 /workspace/src/includes/parser/Parser.php:451
14:04:37 /workspace/src/tests/parser/ParserTestRunner.php:855
14:04:37 /workspace/src/tests/phpunit/includes/parser/ParserIntegrationTest.php:36
14:04:37 /workspace/src/maintenance/doMaintenance.php:92
14:04:37
14:04:37 2) ParserIntegrationTest::testParse with data set "parserTests.txt: Custom attributes" ('[details omitted]')
14:04:37 Failed to invoke Pygments: /usr/bin/env: python: No such file or directory
14:04:37 [Called from SyntaxHighlight::highlight in /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php at line 314]
14:04:37
14:04:37 /workspace/src/includes/debug/MWDebug.php:309
14:04:37 /workspace/src/includes/debug/MWDebug.php:164
14:04:37 /workspace/src/includes/GlobalFunctions.php:1192
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:314
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:121
14:04:37 /workspace/src/includes/parser/Parser.php:3852
14:04:37 /workspace/src/includes/parser/Preprocessor_Hash.php:1145
14:04:37 /workspace/src/includes/parser/Parser.php:2921
14:04:37 /workspace/src/includes/parser/Parser.php:1277
14:04:37 /workspace/src/includes/parser/Parser.php:451
14:04:37 /workspace/src/tests/parser/ParserTestRunner.php:855
14:04:37 /workspace/src/tests/phpunit/includes/parser/ParserIntegrationTest.php:36
14:04:37 /workspace/src/maintenance/doMaintenance.php:92
14:04:37
14:04:37 3) ParserIntegrationTest::testParse with data set "parserTests.txt: Inline attribute (inline code)" ('[details omitted]')
14:04:37 Failed to invoke Pygments: /usr/bin/env: python: No such file or directory
14:04:37 [Called from SyntaxHighlight::highlight in /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php at line 314]
14:04:37
14:04:37 /workspace/src/includes/debug/MWDebug.php:309
14:04:37 /workspace/src/includes/debug/MWDebug.php:164
14:04:37 /workspace/src/includes/GlobalFunctions.php:1192
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:314
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:121
14:04:37 /workspace/src/includes/parser/Parser.php:3852
14:04:37 /workspace/src/includes/parser/Preprocessor_Hash.php:1145
14:04:37 /workspace/src/includes/parser/Parser.php:2921
14:04:37 /workspace/src/includes/parser/Parser.php:1277
14:04:37 /workspace/src/includes/parser/Parser.php:451
14:04:37 /workspace/src/tests/parser/ParserTestRunner.php:855
14:04:37 /workspace/src/tests/phpunit/includes/parser/ParserIntegrationTest.php:36
14:04:37 /workspace/src/maintenance/doMaintenance.php:92
14:04:37
14:04:37 4) ParserIntegrationTest::testParse with data set "parserTests.txt: Enclose none (inline code)" ('[details omitted]')
14:04:37 Failed to invoke Pygments: /usr/bin/env: python: No such file or directory
14:04:37 [Called from SyntaxHighlight::highlight in /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php at line 314]
14:04:37
14:04:37 /workspace/src/includes/debug/MWDebug.php:309
14:04:37 /workspace/src/includes/debug/MWDebug.php:164
14:04:37 /workspace/src/includes/GlobalFunctions.php:1192
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:314
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:121
14:04:37 /workspace/src/includes/parser/Parser.php:3852
14:04:37 /workspace/src/includes/parser/Preprocessor_Hash.php:1145
14:04:37 /workspace/src/includes/parser/Parser.php:2921
14:04:37 /workspace/src/includes/parser/Parser.php:1277
14:04:37 /workspace/src/includes/parser/Parser.php:451
14:04:37 /workspace/src/tests/parser/ParserTestRunner.php:855
14:04:37 /workspace/src/tests/phpunit/includes/parser/ParserIntegrationTest.php:36
14:04:37 /workspace/src/maintenance/doMaintenance.php:92
14:04:37
14:04:37 5) ParserIntegrationTest::testParse with data set "parserTests.txt: Enclose with nowiki" ('[details omitted]')
14:04:37 Failed to invoke Pygments: /usr/bin/env: python: No such file or directory
14:04:37 [Called from SyntaxHighlight::highlight in /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php at line 314]
14:04:37
14:04:37 /workspace/src/includes/debug/MWDebug.php:309
14:04:37 /workspace/src/includes/debug/MWDebug.php:164
14:04:37 /workspace/src/includes/GlobalFunctions.php:1192
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:314
14:04:37 /workspace/src/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php:121
14:04:37 /workspace/src/includes/parser/Parser.php:3852
14:04:37 /workspace/src/includes/parser/CoreParserFunctions.php:1091
14:04:37 /workspace/src/includes/parser/Parser.php:3383
14:04:37 /workspace/src/includes/parser/Parser.php:3106
14:04:37 /workspace/src/includes/parser/Preprocessor_Hash.php:1071
14:04:37 /workspace/src/includes/parser/Parser.php:2921
14:04:37 /workspace/src/includes/parser/Parser.php:1277
14:04:37 /workspace/src/includes/parser/Parser.php:451
14:04:37 /workspace/src/tests/parser/ParserTestRunner.php:855
14:04:37 /workspace/src/tests/phpunit/includes/parser/ParserIntegrationTest.php:36
14:04:37 /workspace/src/maintenance/doMaintenance.php:92
```