Message298162
Consider the following three snippets:
1)
const char* sourceCode =
"a = 9\n"
"a";
// This is OK! Python runs both lines.
// BUT: The value of 'a' is not printed
PyRun_StringFlags(sourceCode, Py_file_input, localDictionary, localDictionary, 0);
2)
// This is OK! We run one statement at a time:
PyRun_StringFlags("a = 9", Py_single_input, localDictionary, localDictionary, 0);
// Python prints the value of 'a' because we use Py_single_input!
PyRun_StringFlags("a", Py_single_input, localDictionary, localDictionary, 0);
3)
const char* sourceCode =
"a = 9\n"
"a";
// This is NOT OK! Python throws a SyntaxError because we used Py_single_input.
PyRun_StringFlags(sourceCode, Py_single_input, localDictionary, localDictionary, 0);
The intention is to be able to run script code in an interpreter built into an application, and to maintain two user features:
1) The behavior is the same as the standard python interpreter with regard to printing values automatically without requiring the print() statement.
2) It is allowed to copy/paste possibly multiple lines/statements and execute them
These two requirements are in conflict, because while Py_single_input enables the first, it forbids the second.
I have worked around this by using internal API in Python-ast.h and setting `mod->kind = Interactive_kind;` before calling `PyAST_CompileEx`, but that should not be needed. |
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Date |
User |
Action |
Args |
2017-07-11 14:34:17 | steveire | set | recipients:
+ steveire |
2017-07-11 14:34:17 | steveire | set | messageid: <1499783657.19.0.814858997931.issue30905@psf.upfronthosting.co.za> |
2017-07-11 14:34:17 | steveire | link | issue30905 messages |
2017-07-11 14:34:17 | steveire | create | |
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