def __init__(self, by):
        if len(by) != 2:
            raise ValueError("You must give a list of length 2 to group by")
        elif by[0] == '.' and by[1] == '.':
            raise ValueError(
                "At least one of grouping attributes must be not a dot")
        self.by = by
Set the name of the generated HTML server documentation
dataset/ETHPy150Open pydata/pandas/pandas/tools/rplot.py/TrellisGrid.__init__--crossover with--dataset/ETHPy150Open OpenCobolIDE/OpenCobolIDE/open_cobol_ide/extlibs/future/backports/xmlrpc/server.py/XMLRPCDocGenerator.set_server_name