in python/src/ru/adelf/idea/dotenv/python/PythonEnvironmentCallsVisitor.java [41:49]
private void visitIndex(PySubscriptionExpression expression) {
if(PythonPsiHelper.checkIndexCall(expression) &&
expression.getIndexExpression() instanceof PyStringLiteralExpression) {
PyStringLiteralExpression stringLiteral = (PyStringLiteralExpression) expression.getIndexExpression();
collectedItems.add(new KeyUsagePsiElement(stringLiteral.getStringValue(), stringLiteral));
}
}