commit 6aa81c2734b48a08ad811205c1adb720d00f53e4
Author: Lukas Winkler <git@lw1.at>
Date:   Fri May 8 14:20:41 2020 +0200

    init

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8005a11
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+config.py
+.idea/
+__pycache__/
+*.pyc
diff --git a/config.sample.py b/config.sample.py
new file mode 100644
index 0000000..6f21110
--- /dev/null
+++ b/config.sample.py
@@ -0,0 +1,7 @@
+people = {
+    "Test1": "test1@example.com",
+    "Test2": "test2@example.com",
+    "Test3": "test3@example.com"
+}
+
+sender = "Randomizer <script@example.com>"
diff --git a/derangement.py b/derangement.py
new file mode 100644
index 0000000..013e460
--- /dev/null
+++ b/derangement.py
@@ -0,0 +1,25 @@
+from random import shuffle
+from typing import List
+
+
+def is_derangement(original: List, shuffled: List) -> bool:
+    return not any([x == y for (x, y) in zip(original, shuffled)])
+
+
+def get_derangement(people: List) -> List:
+    while True:
+        shuffled = people[:]  # make a copy
+        shuffle(shuffled)
+        if is_derangement(people, shuffled):
+            return shuffled
+
+
+def test():
+    a = [1, 2, 3, 4]
+    assert is_derangement(a, [2, 1, 4, 3])
+    assert not is_derangement(a, [1, 2, 4, 3])
+    assert not is_derangement(a, [1, 3, 4, 2])
+    assert is_derangement(a, get_derangement(a))
+
+
+test()
diff --git a/mail.py b/mail.py
new file mode 100644
index 0000000..4a184d2
--- /dev/null
+++ b/mail.py
@@ -0,0 +1,17 @@
+import smtplib
+from email.mime.text import MIMEText
+
+from config import sender
+
+s = smtplib.SMTP('localhost')
+
+
+def notify(name: str, email: str, chosen_person: str) -> None:
+    to = f"{name} <{email}>"
+
+    msg = MIMEText(f"Hello {name},\n\nThe chosen person is {chosen_person}.")
+    msg['Subject'] = f"Result of shuffle for {name}"
+    msg['From'] = sender
+    msg['To'] = to
+    print(msg.as_string())
+    s.sendmail(sender, [to], msg.as_string())
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..7d56da8
--- /dev/null
+++ b/main.py
@@ -0,0 +1,14 @@
+from config import people
+from derangement import get_derangement
+from mail import notify
+
+names = list(people.keys())
+
+shuffled = get_derangement(names)
+print(shuffled)
+
+i = 0
+for name, email in people.items():
+    chosen_person = shuffled[i]
+    notify(name, email, chosen_person)
+    i += 1