l = [1, 2, 3]

l.append("four")

print len(l)            # 4

print l[0]              # 1

print l[1]              # 2

print l[2]              # 3

print l[3]              # four

print l[-1]             # four

print l[-2]             # 3

print l[-3]             # 2

print l[-4]             # 1

print l                 # [1, 2, 3, "four"]

t = (1, 2, 3, "four")

l = list(t)

print l                 # [1, 2, 3, "four"]

try:

    print l[4]          # should raise an exception

except IndexError, exc:

    print "l[4]: failed with argument", exc.index

try:

    print l[-5]         # should raise an exception

except IndexError, exc:

    print "l[-5]: failed with argument", exc.index

print 1 in l            # True

print 4 in l            # False

print "four" in l       # True

print "one" in l        # False

print 1 not in l        # False

print 4 not in l        # True

print "four" not in l   # False

print "one" not in l    # True

print l.index(1)        # 0

print l.index("four")   # 3

try:

    print l.index(4)    # should raise an exception

except ValueError, exc:

    print "l.index(4): failed to find argument", exc.value

# Test equality.

print l == [1, 2, 3]         # False

print l == [1, 2, 3, "four"] # True

# Test concatenation.

a = [1, 2]

a += [3, 4]

print a                 # [1, 2, 3, 4]

b = [5, 6]

c = a + b

print c                 # [1, 2, 3, 4, 5, 6]

# Test removal.

print c.pop()           # 6

print c                 # [1, 2, 3, 4, 5]

d = []

try:

    d.pop()             # should raise an exception

except IndexError, exc:

    print "d.pop(): failed to access item", exc.index