capybara/virtualenv/lib/python2.7/site-packages/setuptools/sandbox.py
def _execfile(filename, globals, locals=None):
    """
    Python 3 implementation of execfile.
    """
    mode = 'rb'
    with open(filename, mode) as stream:
        script = stream.read()
    # compile() function in Python 2.6 and 3.1 requires LF line endings.
    if sys.version_info[:2] < (2, 7) or sys.version_info[:2] >= (3, 0) and sys.version_info[:2] < (3, 2):
        script = script.replace(b'\r\n', b'\n')
        script = script.replace(b'\r', b'\n')
    if locals is None:
        locals = globals
    code = compile(script, filename, 'exec')
    exec(code, globals, locals)
def _execfile(filename, globals, locals=None):
    """
    Python 3 implementation of execfile.
    """
    mode = 'rb'
    with open(filename, mode) as stream:
        script = stream.read()
    # compile() function in Python 2.6 and 3.1 requires LF line endings.
    if sys.version_info[:2] < (2, 7) or sys.version_info[:2] >= (3, 0) and sys.version_info[:2] < (3, 2):
        script = script.replace(b'\r\n', b'\n')
        script = script.replace(b'\r', b'\n')
    if locals is None:
        locals = globals
    code = compile(script, filename, 'exec')
    exec(code, globals, locals)
Python 3 implementation of execfile.