no, becouse is:
this working (return 100):
pyX("Sum=0");
pyX("for X in PyVec: Sum += X");
this code also work:
pyX("def PySum(V):\n\tSum=0\n\tfor X in V:\n\t\tSum =Sum+ X\n\treturn( Sum)\n\n");
pyX("Sum=PySum(PyVec)");
printf("\nSum: %f",pyVar("Sum"));
so, is a better use \t not space,