nobel_gases = ['He', 'Ne', 'Ar', 'Kr', 'Xe', 'Rn']
for gas in nobel_gases:
    print "%s is a nobel gas." % gas

range(1, 10)

range(5)

range(0, 10, 2)

positions = range(10)
for i in positions:
    print i

for i in range(10):
    print i

nobel_gases = ['He', 'Ne', 'Ar', 'Kr', 'Xe', 'Rn']
for i in range(len(nobel_gases)):
    print "%s is a nobel gas." % nobel_gases[i]

nobel_gases = ['He', 'Ne', 'Ar', 'Kr', 'Xe', 'Rn']
atomic_numbers = [2, 10, 18, 36, 54, 86]
for i in range(len(nobel_gases)):
    print "%s is a nobel gas with an atomic number of %s." % (nobel_gases[i], atomic_numbers[i])

nobel_gases = ['He', 'Ne', 'Ar', 'Kr', 'Xe', 'Rn']
for i, gas in enumerate(nobel_gases):
    print i, gas

nobel_gases = ['He', 'Ne', 'Ar', 'Kr', 'Xe', 'Rn']
atomic_numbers = [2, 10, 18, 36, 54, 86]
for i, gas in enumerate(nobel_gases):
    print "%s is a nobel gas with an atomic number of %s." % (gas, atomic_numbers[i])