Make coverage script work on Python 2 again

I tested using both my Python 2 and Python 3, it worked for both.
Worked for me previously because Py3 is my default, not 2 :p

1 files changed, 7 insertions, 2 deletions

diff --git a/tools/disasm_coverage.py b/tools/disasm_coverage.py
index 6c1c030..39d1960 100644
--- a/tools/disasm_coverage.py
+++ b/tools/disasm_coverage.py
@@ -29,8 +29,13 @@ if __name__ == "__main__":
     rows_per_bank = bank_size // (width * bpp)
     
     r = MapReader()
-    with open(args.mapfile, 'r', encoding= "utf-8") as f:
-        l = f.readlines()
+    try:
+        with open(args.mapfile, 'r') as f:
+            l = f.readlines()
+    except UnicodeDecodeError:
+        # Python 3 seems to choke on the file's encoding, but the `encoding` keyword only works on Py3
+        with open(args.mapfile, 'r', encoding= "utf-8") as f:
+            l = f.readlines()
     r.read_map_data(l)
     
     hit_data = [[0] * width for _ in range(height)]