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"""Execute files of Python code."""
import imp, os, sys
from coverage.backward import exec_function
from coverage.misc import NoSource
try:
# In Py 2.x, the builtins were in __builtin__
BUILTINS = sys.modules['__builtin__']
except KeyError:
# In Py 3.x, they're in builtins
BUILTINS = sys.modules['builtins']
def run_python_file(filename, args):
"""Run a python file as if it were the main program on the command line.
`filename` is the path to the file to execute, it need not be a .py file.
`args` is the argument array to present as sys.argv, including the first
element representing the file being executed.
"""
# Create a module to serve as __main__
old_main_mod = sys.modules['__main__']
main_mod = imp.new_module('__main__')
sys.modules['__main__'] = main_mod
main_mod.__file__ = filename
main_mod.__builtins__ = BUILTINS
# Set sys.argv and the first path element properly.
old_argv = sys.argv
old_path0 = sys.path[0]
sys.argv = args
sys.path[0] = os.path.dirname(filename)
try:
try:
source = open(filename, 'rU').read()
except IOError:
raise NoSource("No file to run: %r" % filename)
exec_function(source, filename, main_mod.__dict__)
finally:
# Restore the old __main__
sys.modules['__main__'] = old_main_mod
# Restore the old argv and path
sys.argv = old_argv
sys.path[0] = old_path0
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