input 与raw_input的区别
input只能输入数字
raw_input 既可以输入数字也可以输入字符串
>>> input("input you name:") input you name:carrie Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<string>", line 1, in <module> NameError: name 'carrie' is not defined
>>> input("input you name:") input you name:11 11
>>> raw_input("input you name:") input you name:carrie 'carrie'
>>> raw_input("input you name:") input you name:11 '11'