diff --git a/listdata/__init__.py b/listdata/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/listdata/main.py b/listdata/main.py
new file mode 100644
index 0000000..1ebed41
--- /dev/null
+++ b/listdata/main.py
@@ -0,0 +1,40 @@
+from collections import Counter
+
+
+def main():
+    # Tuple
+    vowels = ('a', 'e', 'i', 'o', 'u')
+
+    word = 'Supercalifragilisticexpialidocious'
+
+    # Loop over string
+    for letter in word:
+        if letter in vowels:
+            print(letter)
+
+    # Count vowels in a word
+    vowels_in_word = [letter for letter in word.lower() if letter in vowels]
+    print(Counter(vowels_in_word), '\n')
+
+    # List share reference between first and second
+    first = [1, 2, 3, 4, 5]
+    print(f"{first=} (initial)")
+    second = first
+    print(f"{second=} (initial)")
+
+    second.append(6)
+    print(f"{second=} (post append)")
+    print(f"{first=} (post append)")
+
+    # If you want create a list's copy you must to use copy method
+    print("Third is a copy of second")
+    third = second.copy()
+    print(f"{third=} (pre append)")
+
+    third.append(7)
+    print(f"{third=} (post append)")
+    print(f"{second=} (post append)")
+
+
+if __name__ == '__main__':
+    main()
diff --git a/listdata/panic.py b/listdata/panic.py
new file mode 100644
index 0000000..4788994
--- /dev/null
+++ b/listdata/panic.py
@@ -0,0 +1,21 @@
+def main():
+    phrase = "Don't panic"
+    plist = list(phrase)
+    print(phrase)
+    print(plist)
+
+    # I insert here my code
+    for i in range(3):
+        plist.pop()
+    plist.pop(0)
+    plist.remove("'")
+    plist.extend([plist.pop(), plist.pop()])
+    plist.insert(2, plist.pop(3))
+
+    new_phrase = ''.join(plist)
+    print(plist)
+    print(new_phrase)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/listdata/panic2.py b/listdata/panic2.py
new file mode 100644
index 0000000..25deea2
--- /dev/null
+++ b/listdata/panic2.py
@@ -0,0 +1,16 @@
+def main():
+    phrase = "Don't panic"
+    plist = list(phrase)
+    print(phrase)
+    print(plist)
+
+    # I insert here my code
+    new_phrase = ''.join(plist[1:3])
+    new_phrase = new_phrase + ''.join([plist[5], plist[4], plist[7], plist[6]])
+
+    print(plist)
+    print(new_phrase)
+
+
+if __name__ == '__main__':
+    main()