init

.gitignore

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+config.py
+.idea/
+__pycache__/
+*.pyc

config.sample.py

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+people = {
+    "Test1": "test1@example.com",
+    "Test2": "test2@example.com",
+    "Test3": "test3@example.com"
+}
+
+sender = "Randomizer <script@example.com>"

derangement.py

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+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()

mail.py

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+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())

main.py

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+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