Update day 18 solution

Parse function is not needed since it can be replaced by eval().

day-18/day-18.py

@@ -2,25 +2,6 @@
 from pathlib import Path
 
 
-def parse(line):
-    if ',' not in line:
-        return int(line)
-    line = line[1:-1]
-    level = 0
-    split_idx = 0
-    for i, c in enumerate(line):
-        if '[' == c:
-            level += 1
-        elif ']' == c:
-            level -= 1
-        elif 0 == level and ',' == c:
-            split_idx = i
-            break
-    left = parse(line[:split_idx])
-    right = parse(line[split_idx + 1:])
-    return (left, right)
-
-
 def explode_to_left(n, l):
     (left, right) = n
     res = True
@@ -123,10 +104,11 @@ def part_1(input):
     n = None
     for line in input:
         line = line.rstrip()
+        nn = eval(line.replace('[', '(').replace(']', ')'))
         if not n:
-            n = parse(line)
+            n = nn
             continue
-        n = (n, parse(line))
+        n = (n, nn)
         res = True
         while res:
             while res:
@@ -140,8 +122,7 @@ def part_2(input):
     result = 0
     nbrs = set()
     for line in input:
-        line = line.rstrip()
-        nbrs.add(parse(line))
+        nbrs.add(eval(line.rstrip().replace('[', '(').replace(']', ')')))
     for n1 in nbrs:
         for n2 in nbrs:
             if n1 == n2: