bpo-41058: Use source file encoding in pdb.find_function(). (GH-21010)

(cherry picked from commit 19fcffa92773e008e4f5efb80047420a0cfafeec)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/Lib/pdb.py b/Lib/pdb.py
index bf503f1..931a039 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -79,6 +79,7 @@ import glob
 import pprint
 import signal
 import inspect
+import tokenize
 import traceback
 import linecache
 
@@ -93,7 +94,7 @@ __all__ = ["run", "pm", "Pdb", "runeval", "runctx", "runcall", "set_trace",
 def find_function(funcname, filename):
     cre = re.compile(r'def\s+%s\s*[(]' % re.escape(funcname))
     try:
-        fp = open(filename)
+        fp = tokenize.open(filename)
     except OSError:
         return None
     # consumer of this info expects the first line to be 1