def std(arg, where=None, how='sample'):
    """
    Compute standard deviation of numeric array

    Parameters
    ----------
    how : {'sample', 'pop'}, default 'sample'

    Returns
    -------
    stdev : double scalar
    """
    expr = ops.StandardDev(arg, how, where).to_expr()
    expr = expr.name('std')
    return expr
def std ( arg , where = None , how = 'sample' ) : expr = ops . StandardDev ( arg , how , where ) . to_expr ( ) expr = expr . name ( 'std' ) return expr
Compute standard deviation of numeric array

    Parameters
    ----------
    how : {'sample', 'pop'}, default 'sample'

    Returns
    -------
    stdev : double scalar