Python2与python3区别（二）

from pip._vendor.distlib.compat import raw_inputnum = 50guess = raw_input("please input :")if guess == num:    print('equal')elif guess < num :    print('lower')else:    print('>')print ("Done!")
运行结果如下：Traceback (most recent call last):  File "F:\JA\TestPython\guess.py", line 7, in <module>    elif guess < num :TypeError: '<' not supported between instances of 'str' and 'int'原因：input()返回的数据类型是str，不能直接和整数进行比较，所以要用int()将str换成整数即可
第三行应该这样写：
guess = int(raw_input("please input :"))