Fix importing execfile from toollib on Python 2

tools/toollib.py

@@ -1,66 +1,66 b''
 """Various utilities common to IPython release and maintenance tools.
 """
 from __future__ import print_function
 
 # Library imports
 import os
 
 # Useful shorthands
 pjoin = os.path.join
 cd = os.chdir
 
 # Constants
 
 # SSH root address of the archive site
 archive_user = '[e-mail]'
 archive_dir = 'archive.ipython.org'
 archive = '%s:%s' % (archive_user, archive_dir)
 
 # Build commands
 # Source dists
 sdists = './setup.py sdist --formats=gztar,zip'
 # Binary dists
 def buildwheels():
     for py in ('2', '3'):
         sh('python%s setupegg.py bdist_wheel' % py)
 
 # Utility functions
 def sh(cmd):
     """Run system command in shell, raise SystemExit if it returns an error."""
     print("$", cmd)
     stat = os.system(cmd)
     #stat = 0  # Uncomment this and comment previous to run in debug mode
     if stat:
         raise SystemExit("Command %s failed with code: %s" % (cmd, stat))
 
 # Backwards compatibility
 c = sh
 
 def get_ipdir():
     """Get IPython directory from command line, or assume it's the one above."""
 
     # Initialize arguments and check location
     ipdir = pjoin(os.path.dirname(__file__), os.pardir)
 
     ipdir = os.path.abspath(ipdir)
 
     cd(ipdir)
     if not os.path.isdir('IPython') and os.path.isfile('setup.py'):
         raise SystemExit('Invalid ipython directory: %s' % ipdir)
     return ipdir
 
 
 def compile_tree(folder='.'):
     """Compile all Python files below current directory."""
     stat = os.system('python -m compileall {}'.format(folder))
     if stat:
         msg = '*** ERROR: Some Python files in tree do NOT compile! ***\n'
         msg += 'See messages above for the actual file that produced it.\n'
         raise SystemExit(msg)
 
 try:
-    execfile
+    execfile = execfile
 except NameError:
     def execfile(fname, globs, locs=None):
         locs = locs or globs
         exec(compile(open(fname).read(), fname, "exec"), globs, locs)