1for i in range(3):
2    print(i)

1for i in range(3):
2    print(i)
3else:
4    print('no left')

1# don't contain 5 (way 1)
2for i in [x for x in range(10) if x != 5]:
3    print i

1# don't contain 5 (way 2)
2for i in list(range(5)) + list(range(6, 10)):
3    print i

1# next (skip 5)
2xr = iter(range(10))
3for i in xr:
4    print(i)
5    if i == 4: next(xr)

1# continue (skip 5)
2for i in range(10):
3    if i == 5: continue
4    print(i)

1i = 1
2while i < 4:
3    print(i)
4    i += 1

1for i in range(6):
2    print(i)
3    if i==2: break

1i = 1
2while i < 6:
3    print(i)
4    if i==3: break
5    i += 1