直接看代码吧，很简单：

print('hello,world')
print('hello','world')
print('100 + 200 = ',100+200)
name = input()
print('hello,',name)
name = input('please enter your name ')
print('hello',name)

运行的时候是这样：

V_XKANGFAN-MC10:lizi v_xkangfan$ python demo.py
hello,world
hello world
V_XKANGFAN-MC10:lizi v_xkangfan$ python demo.py
hello,world
hello world
100 + 200 =  300
fanxiaokang
hello, fanxiaokang
please enter your name fanxiaokang
hello fanxiaokang

很简单，记住就好。