add filename to ENOENT message #4925

Lib/subprocess.py

@@ -1255,6 +1255,8 @@ class Popen(object):
                     errno = int(hex_errno, 16)
                     if errno != 0:
                         err_msg = os.strerror(errno)
+                        if errno == errno.ENOENT:
+                            err_msg += ': ' + repr(args[0])
                     raise child_exception_type(errno, err_msg)
                 raise child_exception_type(err_msg)
 

Lib/test/test_subprocess.py

@@ -666,6 +666,7 @@ class POSIXProcessTestCase(BaseTestCase):
             # string and instead capture the exception that we want to see
             # below for comparison.
             desired_exception = e
+            desired_exception.strerror += ': ' + repr(sys.executable)
         else:
             self.fail("chdir to nonexistant directory %s succeeded." %
                       nonexistent_dir)

Misc/ACKS

@@ -726,6 +726,7 @@ Ilya Sandler
 Mark Sapiro
 Ty Sarna
 Ben Sayer
+Andrew Schaaf
 Michael Scharf
 Andreas Schawo
 Neil Schemenauer

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.2 Beta 1?
 Core and Builtins
 -----------------
 
+- Issue #4925: Add filename to error message when executable can't be found in
+  subprocess.
+
 - Issue #1574217: isinstance now catches only AttributeError, rather than
   masking all errors.