from tqdm import tqdm

class TqdmUpTo(tqdm):
    '''
    Provides `update_to(n)` which uses `tqdm.update(delta_n)`.
    For more details, please refer to https://pypi.org/project/tqdm/ 
    '''
    def update_to(self, b=1, bsize=1, tsize=None):
        '''
        b  : int, optional
            Number of blocks transferred so far [default: 1].
        bsize  : int, optional
            Size of each block (in tqdm units) [default: 1].
        tsize  : int, optional
            Total size (in tqdm units). If [default: None] remains unchanged.
        '''
        if tsize is not None:
            self.total = tsize
        self.update(b * bsize - self.n)  # will also set self.n = b * bsize