day21, lost part 1, and part2 is... ugly

day21.py

@@ -0,0 +1,83 @@
+with open('input21.txt','r') as f:
+    inp = f.read().splitlines(keepends=False)
+
+_monkeys = {}
+
+for line in inp:
+    monkey, value = line.split(': ')
+    _monkeys[monkey] = value
+
+Equation1 = _monkeys['root'].split()[0]
+Equation2 = _monkeys['root'].split()[2]
+print(Equation1, Equation2)
+
+n = 0
+done = False
+
+monkeys = _monkeys.copy()
+monkeys['humn'] = 'humn'
+
+while not done:
+    done = True
+    for item in Equation1.split():
+        if item not in ['-','+','/','*','humn','(',')'] and not item.isnumeric():
+            if monkeys[item].isnumeric():
+                insert = monkeys[item]
+            else:
+                insert = '( ' + monkeys[item] + ' )'
+            Equation1 = Equation1.replace(item, insert)
+            done = False
+            break
+done = False            
+while not done:
+    done = True
+    for item in Equation2.split():
+        if item not in ['-','+','/','*','humn','(',')'] and not item.isnumeric():
+            if monkeys[item].isnumeric():
+                insert = monkeys[item]
+            else:
+                insert = '( ' + monkeys[item] + ' )'
+            Equation2 = Equation2.replace(item, insert)
+            done = False
+            break
+
+if 'humn' in Equation1:
+    Equation1 = Equation1.replace('humn', 'x')
+    Equation = eval('lambda x:' + Equation1)
+else:
+    Equation1 = eval('lambda x:' + Equation1)
+    number = Equation1(1)
+
+if 'humn' in Equation2:
+    Equation2 = Equation2.replace('humn', 'x')
+    Equation = eval('lambda x:' + Equation2)
+else:
+    Equation2 = eval('lambda x:' + Equation2)
+    number = Equation2(1)
+
+if Equation(0) < number:
+    increase = False
+else:
+    increase = True
+
+step = 100000000
+
+while not Equation(n) == number:
+    print(n, Equation(n), number)
+    if increase:
+        if Equation(n) < number:
+            increase = False
+            step /= 10
+        else:
+            n += step
+    else:
+        if Equation(n) > number:
+            increase = True
+            step /= 10
+        else:
+            n -= step
+
+print(n)
+print(Equation1,'\n', Equation2)
+
+

in2.txt

@@ -1,7 +1,15 @@
-1
-2
--3
-3
--2
-0
-4
+root: pppw + sjmn
+dbpl: 5
+cczh: sllz + lgvd
+zczc: 2
+ptdq: humn - dvpt
+dvpt: 3
+lfqf: 4
+humn: 5
+ljgn: 2
+sjmn: drzm * dbpl
+sllz: 4
+pppw: cczh / lfqf
+lgvd: ljgn * ptdq
+drzm: hmdt - zczc
+hmdt: 32