Fix bug where --si=64 was deemed ambiguous when both --si and --size were in the parser.

1 files changed, 7 insertions, 0 deletions

diff --git a/argparse.py b/argparse.py
index 16a778f..8b96e62 100644
--- a/argparse.py
+++ b/argparse.py
@@ -2036,6 +2036,13 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
             action = self._option_string_actions[arg_string]
             return action, arg_string, None
 
+        # if the option string before the "=" is present, return the action
+        if '=' in arg_string:
+            option_string, explicit_arg = arg_string.split('=', 1)
+            if option_string in self._option_string_actions:
+                action = self._option_string_actions[option_string]
+                return action, option_string, explicit_arg
+
         # search through all possible prefixes of the option string
         # and all actions in the parser for possible interpretations
         option_tuples = self._get_option_tuples(arg_string)