diff --git a/12/12.py b/12/12.py
new file mode 100755
index 0000000..38752a5
--- /dev/null
+++ b/12/12.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+
+from collections import namedtuple, UserDict
+
+Pot = namedtuple('Pot', ['id', 'plant'])
+Rule = namedtuple('Rule', ['inp', 'out'])
+newgen = None
+
+class PlantDict(UserDict):
+    def __init__(self, cb, initialdata):
+        super().__init__(initialdata)
+        self._cb = cb
+
+
+    def __missing__(self, key):
+        val = self._cb(key)
+        self[key] = val
+        return val
+
+
+def default_pot(i):
+    return Pot(i, False)
+
+
+def parse_rule(rule):
+    return Rule([c == '#' for c in rule[:5]], '#' in rule.split()[-1])
+    
+
+def print_pots(pots):
+    print(''.join(['#' if pot.plant else '.' for pot in pots]))
+
+
+def main():
+    # I’m aware that I’m overwriting a builtin here
+    input = []
+    with open('input') as f:
+        input = f.readlines()
+    new_gen = PlantDict(default_pot, enumerate([Pot(i, c == '#') for i, c in enumerate(input[0].split(': ')[1])]))
+    print_pots(new_gen.values())
+    rules = [parse_rule(r) for r in input[2:]]
+    for rule in rules:
+        print(''.join(['#' if x else '.' for x in rule.inp]))
+
+    for _ in range(20):
+        old_gen = new_gen.copy()
+        ids = new_gen.keys()
+        for i in range(min(ids) - 2, max(ids) + 3): 
+            surroundings = [p.plant for p in [old_gen[x] for x in range(i-2, i+3)]]
+            for rule in rules:
+                if surroundings == rule.inp:
+                    new_gen[i] = Pot(i, rule.out)
+                    break
+        print_pots(new_gen.values())
+
+    print(sum([pot.id for pot in new_gen.values() if pot.plant]))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/README.md b/README.md
index 5f560d7..6deaaf7 100644
--- a/README.md
+++ b/README.md
@@ -4,8 +4,8 @@
 ## Tickets
 | Lang.  | 1 | 2 | 3 | 4 | 5 |
 |:-------|---|---|---|---|---|
-| C      | x | x | x | x |(x)|
+| C      | x | x | x | x |   |
 | Go     | x | x | x |   |   |
 | Kotlin | x | x | x |   |   |
-| Python | x |   |   |   |   |
+| Python | x | x |   |   |   |
 | Rust   | x | x |   |   |   |