python os.path.isfile()因参数问题判断错误的解决

def list_py(path = None):
 if path == None:
  path = os.getcwd()
 return [fname for fname in os.listdir(path)
 if os.path.isfile(fname) and fname.endswith('.py')

> list_py()
['cmdtest.py', 'datatest.py', 'excel_combine.py', 'input.py', 'iotest.py', 'load_data_test.py', 'numpy_arraytest.py', 'ooptest.py', 'pandas_test.py', 'str_test.py', 'test.py', 'wordstats.py']

> list_py('D:\Python\PythonProject\data_mining_with_python')
[]

os.path.isfile()

os.path.join(path,fname)