TXT文本内容逐个删除

#! encoding:utf-8

'''''''''
TXT文本处理，

优惠券码，每次使用一个优惠券码就将使用的券码删除

'''


def read_coupon(FilePath):
    with open(FilePath, 'r',encoding='utf-8') as old_file:
        with open(FilePath, 'r+',encoding='utf-8') as new_file:
            current_line = 0
            for i in range(1):
                j = i - 1
                while current_line < (j - 1):
                    old_file.readline()
                    current_line += 1
            seek_point = old_file.tell()
            new_file.seek(seek_point, 0)
            old_file.readline()
            next_line = old_file.readline()
            while next_line:
                new_file.write(next_line)
                next_line = old_file.readline()
            new_file.truncate()