Added Python versions of stat formulae.

diff --git a/pokedex/formulae.py b/pokedex/formulae.py
new file mode 100644 (file)
index 0000000..2059db7
--- /dev/null
+++ b/pokedex/formulae.py
@@ -0,0 +1,21 @@
+# encoding: utf8
+"""Faithful translations of calculations the games make."""
+
+def calculated_stat(base_stat, level, iv, effort):
+    """Returns the calculated stat -- i.e. the value actually shown in the game
+    on a Pokémon's status tab.
+    """
+
+    # Remember: this is from C; use floor division!
+    return (base_stat * 2 + iv + effort // 4) * level // 100 + 5
+
+def calculated_hp(base_hp, level, iv, effort):
+    """Similar to `calculated_stat`, except with a slightly different formula
+    used specifically for HP.
+    """
+
+    # Shedinja's base stat of 1 is special; its HP is always 1
+    if base_hp == 1:
+        return 1
+
+    return (base_hp * 2 + iv + effort // 4) * level // 100 + 10 + level