在python中索引数量列表元素

Question

I have a text file where I have this information:

BRIEF DESCRIPTION A herbaceous, upright, often much branched, slightly woody plant, up to 2-4 m in height, with spiny pubescence, large yellow flowers, and fruits which at maturity dry to a longitudinally dehiscent capsule, 25 cm long or more. USES The young immature fruits are eaten fresh, cooked or fried as vegetables and the can be frozen, canned or dried. Fruits have medicinal properties. Ripe seeds contain 20% edible oil and they can be used as a substitute for coffee. In India, mucilage from the roots and stems has industrial value for clarifying sugarcane juice in gur manufacture. Dried okra powder is used in salad dressings, ice creams, cheese spreads, and confectionery. The stems provide a fiber of inferior quality. GROWING PERIOD Annual. May require 50-90 days to first harvest and the harvest period may continue up to 180 days. COMMON NAMES Okra, Ochro, Lady's Finger, Gumbo, Gombo, Cantarela, Quingombo, Rosenapfel, Bindi, Bhindee, Bhindi, Mesta, Vendakai, Kachang bendi, Kachang lender, Sayur bendi, Kachieb, Grajee-ap morn, You-padi, Ch'aan K'e, Tsau Kw'ai, Ila, Ilasha, Ilashodo, Quimbambo, Kopi arab, Khua ngwang, Krachiap mon, Dau bap. FURTHER INF Scientific synonym: Hibiscus esculentus. Okra originated in South-East Asia. Most varieties grow well in the lowland humid tropics up to elevations of 1000 m. Adapted to moderate to high humidity. Okra is a short-day plant, but it has a wide geographic distribution, up to latitudes 35-40°S and N. Yields of green pods are often low, about 2-4 t/ha owing to extreme growing conditiuons, but up to 10-40 t/ha may be produced.

I am using the library quantulum which extracts all the measurement automatically.

BriefDescription is a variable that contains text
The QuantDescription stores all the quantity from the BriefDescription
I need to get the values that are "metre" string in the second parameter of the quantity tuple
I need to figure out how to get the index of the tuples

    quantsDescription = parser.parse(BriefDescription)
    quantsUses = parser.parse(Uses)
    quantsPeriod = parser.parse(GrowingPeriod)
    print 'BriefDescription Quant:'
    print quantsDescription
    print 'Uses Quant:' 
    print quantsUses
    print 'GrowingPeriod Quant:'
    print quantsPeriod
    for i in quantsDescription:
        print type(i[1])  # indexing the second element of the tuple?

This the output list for quantsDescription:
[Quantity(2, "metre"), Quantity(4, "metre"), Quantity(25, "centimetre")]

Answer 1

print quantsDescription[0].unit.name # to get the unit's quantity
print quantsDescription[0].value # to get the amount of the quantity