My xarray utilities

xr_utilities.py

def longest_com_period_possible(xa_list):
    """Determine the longest common period for list of xarrays
    
    Parameters
    ----------
    xa_list: list of xarray dataarrays
    
    Returns
    -------
    period: slice
      The longest common period for list of xarrays in slice form intended for .sel in xarray
    """
    min_ls = []
    max_ls = []
    for xa in xa_list:
        min_ls.append(np.min(xa.time.to_index().year))
        max_ls.append(np.max(xa.time.to_index().year))
    period = slice(str(np.max(min_ls)), str(np.min(max_ls)))     
    return period