def read_in_chunks(file_obj,chunk_size):

 """Lazy function (generator) to read a file piece by piece"""

 　　while True:

 　　　　data = file_obj.read(chunk_size)

 　　　　if data == "":

 　　　　　　break

 　　　　yield data

 file = open(file_path,"rb")

 for piece in read_in_chunks(file,chunk_size):

 　　process_data(piece)