diff --git a/typechecker/src/semantic_analyzer.rs b/typechecker/src/semantic_analyzer.rs
index 8e43e465..42481821 100644
--- a/typechecker/src/semantic_analyzer.rs
+++ b/typechecker/src/semantic_analyzer.rs
@@ -254,13 +254,9 @@ impl TraversalVisitor for SemanticAnalyzer {
         }
     }
 
-    fn visit_import(&mut self, _i: &parser::ast::Import) {
-        todo!();
-    }
+    fn visit_import(&mut self, _i: &parser::ast::Import) {}
 
-    fn visit_import_from(&mut self, _i: &parser::ast::ImportFrom) {
-        todo!();
-    }
+    fn visit_import_from(&mut self, _i: &parser::ast::ImportFrom) {}
 
     fn visit_if(&mut self, i: &parser::ast::If) {
         for stmt in &i.body {
@@ -419,99 +415,55 @@ impl TraversalVisitor for SemanticAnalyzer {
 
     fn visit_tuple(&mut self, _t: &parser::ast::Tuple) {}
 
-    fn visit_dict(&mut self, _d: &parser::ast::Dict) {
-        todo!()
-    }
+    fn visit_dict(&mut self, _d: &parser::ast::Dict) {}
 
-    fn visit_set(&mut self, _s: &parser::ast::Set) {
-        todo!()
-    }
+    fn visit_set(&mut self, _s: &parser::ast::Set) {}
 
     fn visit_name(&mut self, _n: &parser::ast::Name) {}
 
-    fn visit_bool_op(&mut self, _b: &parser::ast::BoolOperation) {
-        todo!()
-    }
+    fn visit_bool_op(&mut self, _b: &parser::ast::BoolOperation) {}
 
-    fn visit_unary_op(&mut self, _u: &parser::ast::UnaryOperation) {
-        todo!()
-    }
+    fn visit_unary_op(&mut self, _u: &parser::ast::UnaryOperation) {}
 
     fn visit_bin_op(&mut self, _b: &parser::ast::BinOp) {}
 
-    fn visit_named_expr(&mut self, _n: &parser::ast::NamedExpression) {
-        todo!()
-    }
+    fn visit_named_expr(&mut self, _n: &parser::ast::NamedExpression) {}
 
-    fn visit_yield(&mut self, _y: &parser::ast::Yield) {
-        todo!()
-    }
+    fn visit_yield(&mut self, _y: &parser::ast::Yield) {}
 
-    fn visit_yield_from(&mut self, _y: &parser::ast::YieldFrom) {
-        todo!()
-    }
+    fn visit_yield_from(&mut self, _y: &parser::ast::YieldFrom) {}
 
-    fn visit_starred(&mut self, _s: &parser::ast::Starred) {
-        todo!()
-    }
+    fn visit_starred(&mut self, _s: &parser::ast::Starred) {}
 
-    fn visit_generator(&mut self, _g: &parser::ast::Generator) {
-        todo!()
-    }
+    fn visit_generator(&mut self, _g: &parser::ast::Generator) {}
 
-    fn visit_list_comp(&mut self, _l: &parser::ast::ListComp) {
-        todo!()
-    }
+    fn visit_list_comp(&mut self, _l: &parser::ast::ListComp) {}
 
-    fn visit_set_comp(&mut self, _s: &parser::ast::SetComp) {
-        todo!()
-    }
+    fn visit_set_comp(&mut self, _s: &parser::ast::SetComp) {}
 
-    fn visit_dict_comp(&mut self, _d: &parser::ast::DictComp) {
-        todo!()
-    }
+    fn visit_dict_comp(&mut self, _d: &parser::ast::DictComp) {}
 
-    fn visit_attribute(&mut self, _a: &parser::ast::Attribute) {
-        todo!()
-    }
+    fn visit_attribute(&mut self, _a: &parser::ast::Attribute) {}
 
-    fn visit_subscript(&mut self, _s: &parser::ast::Subscript) {
-        todo!()
-    }
+    fn visit_subscript(&mut self, _s: &parser::ast::Subscript) {}
 
-    fn visit_slice(&mut self, _s: &parser::ast::Slice) {
-        todo!()
-    }
+    fn visit_slice(&mut self, _s: &parser::ast::Slice) {}
 
     fn visit_call(&mut self, _c: &parser::ast::Call) {}
 
-    fn visit_await(&mut self, _a: &parser::ast::Await) {
-        todo!()
-    }
+    fn visit_await(&mut self, _a: &parser::ast::Await) {}
 
-    fn visit_compare(&mut self, _c: &parser::ast::Compare) {
-        todo!()
-    }
+    fn visit_compare(&mut self, _c: &parser::ast::Compare) {}
 
-    fn visit_lambda(&mut self, _l: &parser::ast::Lambda) {
-        todo!()
-    }
+    fn visit_lambda(&mut self, _l: &parser::ast::Lambda) {}
 
-    fn visit_if_exp(&mut self, _i: &parser::ast::IfExp) {
-        todo!()
-    }
+    fn visit_if_exp(&mut self, _i: &parser::ast::IfExp) {}
 
-    fn visit_joined_str(&mut self, _j: &parser::ast::JoinedStr) {
-        todo!()
-    }
+    fn visit_joined_str(&mut self, _j: &parser::ast::JoinedStr) {}
 
-    fn visit_formatted_value(&mut self, _f: &parser::ast::FormattedValue) {
-        todo!()
-    }
+    fn visit_formatted_value(&mut self, _f: &parser::ast::FormattedValue) {}
 
-    fn visit_alias(&mut self, _a: &parser::ast::Alias) {
-        todo!()
-    }
+    fn visit_alias(&mut self, _a: &parser::ast::Alias) {}
 
     fn visit_assign(&mut self, assign: &parser::ast::Assign) {
         let value = &assign.value;
@@ -557,35 +509,21 @@ impl TraversalVisitor for SemanticAnalyzer {
         self.visit_expr(&a.value);
     }
 
-    fn visit_assert(&mut self, _a: &parser::ast::Assert) {
-        todo!()
-    }
+    fn visit_assert(&mut self, _a: &parser::ast::Assert) {}
 
     fn visit_pass(&mut self, _p: &parser::ast::Pass) {}
 
-    fn visit_delete(&mut self, _d: &parser::ast::Delete) {
-        todo!()
-    }
+    fn visit_delete(&mut self, _d: &parser::ast::Delete) {}
 
     fn visit_return(&mut self, _r: &parser::ast::Return) {}
 
-    fn visit_raise(&mut self, _r: &parser::ast::Raise) {
-        todo!()
-    }
+    fn visit_raise(&mut self, _r: &parser::ast::Raise) {}
 
-    fn visit_break(&mut self, _b: &parser::ast::Break) {
-        todo!()
-    }
+    fn visit_break(&mut self, _b: &parser::ast::Break) {}
 
-    fn visit_continue(&mut self, _c: &parser::ast::Continue) {
-        todo!()
-    }
+    fn visit_continue(&mut self, _c: &parser::ast::Continue) {}
 
-    fn visit_global(&mut self, _g: &parser::ast::Global) {
-        todo!()
-    }
+    fn visit_global(&mut self, _g: &parser::ast::Global) {}
 
-    fn visit_nonlocal(&mut self, _n: &parser::ast::Nonlocal) {
-        todo!()
-    }
+    fn visit_nonlocal(&mut self, _n: &parser::ast::Nonlocal) {}
 }
diff --git a/typechecker/src/testdata/output/typechecker__type_check__type_evaluator__tests__type_eval_vars.snap b/typechecker/src/testdata/output/typechecker__type_check__type_evaluator__tests__type_eval_vars.snap
index 4dc4cef1..670ef791 100644
--- a/typechecker/src/testdata/output/typechecker__type_check__type_evaluator__tests__type_eval_vars.snap
+++ b/typechecker/src/testdata/output/typechecker__type_check__type_evaluator__tests__type_eval_vars.snap
@@ -1,6 +1,6 @@
 ---
 source: typechecker/src/type_check/type_evaluator.rs
-description: "# define variables with various types for testing\na = 1\nb = 2\nc = True\nd = False\ne = \"hello\"\nf = \"world\"\n# g = [1,2,3]\n# h = (1,2,3)\n# i = {1,2,3}\n# j = {\"a\":1,\"b\":2,\"c\":3}\n# k = None\n\na\nb\nc\nd\ne\nf\ng\nh\ni\nj\nk\n\n"
+description: "# define variables with various types for testing\na = 1\nb = 2\nc = True\nd = False\ne = \"hello\"\nf = \"world\"\njoined_str = f\"{e} {f}\"\n\ng = [1,2,3]\nh = (1,2,3)\ni = {1,2,3}\nj = {\"a\":1,\"b\":2,\"c\":3}\nk = None\n\na\nb\nc\nd\ne\nf\njoined_str\ng\nh\ni\nj\nk\n\n"
 expression: result
 ---
 [
@@ -30,22 +30,26 @@ expression: result
     ),
     (
         "g",
-        "Unknown",
+        "builtins.list[Int]",
     ),
     (
         "h",
-        "Unknown",
+        "builtins.tuple[Int]",
     ),
     (
         "i",
-        "Unknown",
+        "builtins.set[Int]",
     ),
     (
         "j",
-        "Unknown",
+        "builtins.dict[Str, Int]",
+    ),
+    (
+        "joined_str",
+        "Str",
     ),
     (
         "k",
-        "Unknown",
+        "None",
     ),
 ]
diff --git a/typechecker/src/type_check/builtins.rs b/typechecker/src/type_check/builtins.rs
index e8eac083..e9fc3bf5 100644
--- a/typechecker/src/type_check/builtins.rs
+++ b/typechecker/src/type_check/builtins.rs
@@ -1 +1,4 @@
 pub const LIST_TYPE: &str = "builtins.list";
+pub const TUPLE_TYPE: &str = "builtins.tuple";
+pub const DICT_TYPE: &str = "builtins.dict";
+pub const SET_TYPE: &str = "builtins.set";
diff --git a/typechecker/src/type_check/testdata/inputs/type_eval_vars.py b/typechecker/src/type_check/testdata/inputs/type_eval_vars.py
index 87aff117..42406478 100644
--- a/typechecker/src/type_check/testdata/inputs/type_eval_vars.py
+++ b/typechecker/src/type_check/testdata/inputs/type_eval_vars.py
@@ -5,11 +5,13 @@
 d = False
 e = "hello"
 f = "world"
-# g = [1,2,3]
-# h = (1,2,3)
-# i = {1,2,3}
-# j = {"a":1,"b":2,"c":3}
-# k = None
+joined_str = f"{e} {f}"
+
+g = [1,2,3]
+h = (1,2,3)
+i = {1,2,3}
+j = {"a":1,"b":2,"c":3}
+k = None
 
 a
 b
@@ -17,6 +19,7 @@
 d
 e
 f
+joined_str
 g
 h
 i
diff --git a/typechecker/src/type_check/type_evaluator.rs b/typechecker/src/type_check/type_evaluator.rs
index cc30de6d..bbd7610f 100755
--- a/typechecker/src/type_check/type_evaluator.rs
+++ b/typechecker/src/type_check/type_evaluator.rs
@@ -59,25 +59,34 @@ impl TypeEvaluator {
                 &b.op,
             ),
             ast::Expression::List(l) => {
-                let mut prev_elm_type = Type::Unknown;
-                for elm in &l.elements {
-                    let elm_type = self.get_type(elm);
-                    if prev_elm_type == Type::Unknown {
-                        prev_elm_type = elm_type;
-                    } else if prev_elm_type != elm_type {
-                        prev_elm_type = Type::Unknown;
-                        break;
-                    }
-                }
-                let final_elm_type = prev_elm_type;
+                let final_elm_type = self.get_sequence_type_from_elements(&l.elements);
                 Type::Class(super::types::ClassType {
                     name: builtins::LIST_TYPE.to_string(),
                     args: vec![final_elm_type],
                 })
             }
-            ast::Expression::Tuple(_) => todo!(),
-            ast::Expression::Dict(_) => todo!(),
-            ast::Expression::Set(_) => todo!(),
+            ast::Expression::Tuple(t) => {
+                let elm_type = self.get_sequence_type_from_elements(&t.elements);
+                Type::Class(super::types::ClassType {
+                    name: builtins::TUPLE_TYPE.to_string(),
+                    args: vec![elm_type],
+                })
+            }
+            ast::Expression::Dict(d) => {
+                let key_type = self.get_sequence_type_from_elements(&d.keys);
+                let value_type = self.get_sequence_type_from_elements(&d.values);
+                Type::Class(super::types::ClassType {
+                    name: builtins::DICT_TYPE.to_string(),
+                    args: vec![key_type, value_type],
+                })
+            }
+            ast::Expression::Set(s) => {
+                let elm_type = self.get_sequence_type_from_elements(&s.elements);
+                Type::Class(super::types::ClassType {
+                    name: builtins::SET_TYPE.to_string(),
+                    args: vec![elm_type],
+                })
+            }
             ast::Expression::BoolOp(_) => todo!(),
             ast::Expression::UnaryOp(_) => todo!(),
             ast::Expression::NamedExpr(_) => todo!(),
@@ -110,8 +119,8 @@ impl TypeEvaluator {
             ast::Expression::Compare(_) => todo!(),
             ast::Expression::Lambda(_) => todo!(),
             ast::Expression::IfExp(_) => todo!(),
-            ast::Expression::JoinedStr(_) => todo!(),
-            ast::Expression::FormattedValue(_) => todo!(),
+            ast::Expression::JoinedStr(_) => Type::Str,
+            ast::Expression::FormattedValue(f) => self.get_type(&f.value),
         }
     }
 
@@ -152,6 +161,20 @@ impl TypeEvaluator {
             None => Type::Unknown,
         }
     }
+
+    fn get_sequence_type_from_elements(&self, elements: &Vec<ast::Expression>) -> Type {
+        let mut prev_elm_type = Type::Unknown;
+        for elm in elements {
+            let elm_type = self.get_type(elm);
+            if prev_elm_type == Type::Unknown {
+                prev_elm_type = elm_type;
+            } else if prev_elm_type != elm_type {
+                prev_elm_type = Type::Unknown;
+                break;
+            }
+        }
+        prev_elm_type
+    }
 }
 
 impl TraversalVisitorImmutGeneric<Type> for TypeEvaluator {
@@ -425,7 +448,6 @@ impl TraversalVisitorImmutGeneric<Type> for TypeEvaluator {
 #[cfg(test)]
 mod tests {
     use std::collections::HashMap;
-
     use super::*;
     // TODO: refactor and move the test to type check mod
     fn snapshot_type_eval(source: &str) -> String {