diff --git a/Python/src/ConcurrentAdder/ConcurrentAdder.lf b/Python/src/ConcurrentAdder/ConcurrentAdder.lf
new file mode 100644
index 00000000..9315769a
--- /dev/null
+++ b/Python/src/ConcurrentAdder/ConcurrentAdder.lf
@@ -0,0 +1,38 @@
+target Python {
+    timeout: 5 sec
+}
+
+reactor Counter(stride(1), period(1 sec)) {
+    state count(0);
+    // timer triggers reaction
+    timer t(0, period);
+    output out;
+    reaction(t) -> out {= 
+        out.set(self.count)
+        self.count += self.stride
+    =}
+}
+
+reactor Adder(bank_value(1)) {
+    input _in;
+    output out;
+    reaction(_in) -> out {=
+        out.set(_in.value + self.bank_value)
+    =}
+}
+
+reactor Printer(N(4)) {
+    input[N] _in;
+    reaction(_in) {=
+        for i in range(self.N):
+            print(f"Result {_in[i].value}")
+    =}
+}
+
+main reactor(stride(10), period(1 sec), N(4)) {
+    c = new Counter(stride=stride, period=period);
+    a = new[4] Adder();
+    p = new Printer(N=N);
+    (c.out)+ -> a._in;
+    a.out -> p._in;
+}
\ No newline at end of file
diff --git a/Python/src/HelloWorld/HelloWorld.lf b/Python/src/HelloWorld/HelloWorld.lf
new file mode 100644
index 00000000..927f5eaa
--- /dev/null
+++ b/Python/src/HelloWorld/HelloWorld.lf
@@ -0,0 +1,27 @@
+target Python {
+    timeout: 3 sec
+}
+
+reactor Counter(stride(1)) {
+    state count(0)
+    timer t(0, 1 sec)
+    output out
+    reaction(t) -> out {=
+        out.set(self.count)
+        self.count += self.stride
+    =}
+}
+
+reactor Printer {
+    input _in
+    reaction(_in) {=
+        # using thread-safe print function provided by the runtime
+        print(f"Hello World! {_in.value}.")
+    =}
+}
+
+main reactor {
+    c = new Counter(stride = 1)
+    p = new Printer()
+    c.out -> p._in
+}
\ No newline at end of file
diff --git a/Python/src/SharedList/SharedList.lf b/Python/src/SharedList/SharedList.lf
new file mode 100644
index 00000000..df0cb6bf
--- /dev/null
+++ b/Python/src/SharedList/SharedList.lf
@@ -0,0 +1,73 @@
+'''
+This is a shared itemlist for multiple people 
+to appendItem or deltetItem at the same time 
+
+Simulate when multiple clients append or delete items from the 
+same sharedItem list.
+'''
+target Python {
+    timeout: 1 sec
+}
+
+reactor List {
+    state itemList;
+    timer t(0, 2 sec);
+    output out;
+    reaction(t) -> out {=
+        self.itemList = ["bear", "oski", "frosty"]
+        out.set(self.itemList)
+    =}
+}
+
+reactor AddItem(index(0), item("cal")) {
+    input itemList;
+    output out;
+    reaction(itemList) -> out {=
+        # do nothing if index out of range
+        n = len(itemList.value)
+        if 0 <= self.index < n:
+            itemList.value.insert(self.index, self.item)
+        out.set(itemList.value)
+    =}
+}
+
+reactor DeleteItem(index(0)) {
+    input itemList;
+    output out;
+    reaction(itemList) -> out {=
+        n = len(itemList.value)
+        if 0 <= self.index < n:
+            del itemList.value[self.index]
+        out.set(itemList.value)
+    =}
+}
+
+reactor UpdateItem(index(0), item("update")) {
+    input itemList;
+    output out;
+    reaction(itemList) -> out {=
+        itemList.value[self.index] = self.item
+        out.set(itemList.value)
+    =}
+}
+
+reactor Printer(N(3)) {
+    input[N] _in;
+    reaction(_in) {=
+        for i in range(self.N):
+            print(_in[i].value)
+    =}
+}
+
+main reactor {
+    l = new List();
+    add_item = new AddItem();
+    delete_item = new DeleteItem(index = 1);
+    upadate_item = new UpdateItem();
+    p = new Printer();
+    l.out -> add_item.itemList;
+    l.out -> delete_item.itemList;
+    l.out -> upadate_item.itemList;
+    add_item.out, delete_item.out, upadate_item.out -> p._in;
+}
+