def choose_one_variable(kind_of_data_in_table, stations):

    if len(stations) > 1:
        for station in stations:
            print '-You have data for station %s' % (str(station))

        print ''
        station_ID = question.digit_station('Enter the station ID that you want to use: ', stations)
    else:
        station_ID = stations[0]

    variables1 = []
    stationIDs1 = []
    filenames1 = []
    kinds1 = []

    variable1_specs = []

    #'select variable from station'
    variable1 = select_variable(kind_of_data_in_table, station_ID)
    #'create variable specifications for variable'
    for i in kind_of_data_in_table:
        if station_ID in i[0]:
            kind = kind_of_variable(i, station_ID, variable1)
            variables1.append(variable1)
            stationIDs1.append(station_ID)
            filenames1.append(i[0])
            kinds1.append(kind)

    variable1_specs = zip(variables1, filenames1, stationIDs1, kinds1)

    return variable1_specs
def choose_variables_for_correlation(kind_of_data_in_table, stations):

    variable1 = []
    variable2 = []

    variable1_specs = []
    variable2_specs = []

    variables1 = []
    stationIDs1 = []
    filenames1 = []
    kinds1 = []


    variables2 = []
    stationIDs2 = []
    filenames2 = []
    kinds2 = []

    kind = ''

    if len(stations) == 1:
        if not variable1:
            #'select var1 from station 1'
            variable1 = select_variable(kind_of_data_in_table, stations[0])
            #'create variable specifications for var1 from station 1'
            for i in kind_of_data_in_table:
                kind = kind_of_variable(i, stations[0], variable1)
                variables1.append(variable1)
                stationIDs1.append(stations[0])
                filenames1.append(i[0])
                kinds1.append(kind)

            variable1_specs = zip(variables1, filenames1, stationIDs1, kinds1)

        if variable1:
            #'select var2 from station 1'
            variable2 = select_variable(kind_of_data_in_table, stations[0])
            #'create variable specifications for var2 from station 1'
            for i in kind_of_data_in_table:
                kind = kind_of_variable(i, stations[0], variable2)
                variables2.append(variable2)
                stationIDs2.append(stations[0])
                filenames2.append(i[0])
                kinds2.append(kind)

            variable2_specs = zip(variables2, filenames2, stationIDs2, kinds2)

    if len(stations) == 2:
        if not variable1:
            #'select var1 from station 1'
            variable1 = select_variable(kind_of_data_in_table, stations[0])
            #'create variable specifications for var1 from station 1'
            for i in kind_of_data_in_table:
                if str(stations[0]) in i[0]:
                    kind = kind_of_variable(i, stations[0], variable1)
                    variables1.append(variable1)
                    stationIDs1.append(stations[0])
                    filenames1.append(i[0])
                    kinds1.append(kind)

                    variable1_specs = zip(variables1, filenames1, stationIDs1, kinds1)

        if variable1:
            #'select var2 from station 2'
            variable2 = select_variable(kind_of_data_in_table, stations[1])
            for i in kind_of_data_in_table:
                if str(stations[1]) in i[0]:
                    kind = kind_of_variable(i, stations[1], variable2)
                    variables2.append(variable2)
                    stationIDs2.append(stations[1])
                    filenames2.append(i[0])
                    kinds2.append(kind)

                    variable2_specs = zip(variables2, filenames2, stationIDs2, kinds2)

    return variable1_specs, variable2_specs