In [1]: i=1
In [2]: while (i<5):
...: print(i)
...: i=i+1
...:
1
2
3
4
In [3]: i=0
In [4]: instructors=["Duan","Charlie","Stuart","Allen"]
In [5]: while (i<4):
....: print("Hello,", instructors[i])
....: i=i+1
....:
Hello, Duan
Hello, Charlie
Hello, Stuart
Hello, Allen
