import os
__all__ = ['prepend_file_name']
def prepend_file_name(path: str, name: str) -> str:
"""
Prepend the name to the base file name of the input path.
e.g. data/cooking.stackexchange.txt, prepend 'train' to the base file name
data/train_cooking.stackexchange.txt
Parameters
----------
path : str
Path to a file.
name : str
Name that we'll prepend to the base file name.
Returns
-------
prepended_file_name : str
"""
directory = os.path.dirname(path)
file_name = os.path.basename(path)
return os.path.join(directory, name + '_' + file_name)
