in python/src/ru/adelf/idea/dotenv/python/PythonEnvironmentCallsVisitor.java [30:39]
private void visitCall(PyCallExpression expression) {
if(PythonPsiHelper.checkGetMethodCall(expression)
&& expression.getArgumentList() != null
&& expression.getArgumentList().getArguments().length > 0
&& expression.getArgumentList().getArguments()[0] instanceof PyStringLiteralExpression) {
PyStringLiteralExpression stringLiteral = (PyStringLiteralExpression) expression.getArgumentList().getArguments()[0];
collectedItems.add(new KeyUsagePsiElement(stringLiteral.getStringValue(), stringLiteral));
}
}