Make rustpython -i script.py work like it does in CPython

src/main.rs

@@ -368,8 +368,15 @@ fn run_rustpython(vm: &VirtualMachine, matches: &ArgMatches) -> PyResult<()> {
     } else if let Some(module) = matches.value_of("m") {
         run_module(&vm, module)?;
     } else if let Some(filename) = matches.value_of("script") {
-        run_script(&vm, scope, filename)?
+        run_script(&vm, scope.clone(), filename)?;
+        if matches.is_present("inspect") {
+            shell::run_shell(&vm, scope)?;
+        }
     } else {
+        println!(
+            "Welcome to the magnificent Rust Python {} interpreter \u{1f631} \u{1f596}",
+            crate_version!()
+        );
         shell::run_shell(&vm, scope)?;
     }
 

src/shell.rs

@@ -41,11 +41,6 @@ fn shell_exec(vm: &VirtualMachine, source: &str, scope: Scope) -> ShellExecResul
 }
 
 pub fn run_shell(vm: &VirtualMachine, scope: Scope) -> PyResult<()> {
-    println!(
-        "Welcome to the magnificent Rust Python {} interpreter \u{1f631} \u{1f596}",
-        crate_version!()
-    );
-
     let mut repl = Readline::new(helper::ShellHelper::new(vm, scope.clone()));
     let mut full_input = String::new();