def test():

u = [100, 200]

print(u)

print('len: ', len(u))

a = []

print("append func:", a.append)

print("insert func:", a.insert)

print("pop func:", a.pop)

print("extend func:", a.extend)

a.append(1)

print(a)

a.append(2)

print(a)

#b = a[:] ## TODO support slice copy

#print(b)

print('testing copy vec list')

c = list(a)

print(c)

print('testing index vec list')

print( c[0] )

print( c[-1] )

print('testing vec list multiply by number')

print( c * 4 )

print('testing vec list extend')

print('extend func: ', c.extend)

c.extend([99,100])

print(c)

print('--------------------------')

x = ['a', 'b', 'c']

print(x)

print('len: ', len(x))

print(x[0])

print(x[-1])

print(x * 4 )

x.extend([99,100])

print(x)

print('testing 2d list')

d = []

d.append(a)

d.append(c)

print(d)

print('testing list comp')

e = [i for i in range(10)]

print(e)

print('testing list * n')

m = [0] * 3

assert len(m)==3

print(m)

print('testing range')

r = range(10)

print(r)

assert len(r)==10

print('testing iter over range')

for j in r:

print(j)

print('testing iter over range again')

for j in r:

print(j)

test()