Question

python程序问题（TypeError: cannot concatenate 'str' and 'int' objects）

原题是要求运行时是这样的：
Please think of a number between 0 and 100!
Is your secret number 50?
Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. l（这个 l 以及下面的 h 和 c 是自己手动输入的）
Is your secret number 75?
Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. l
Is your secret number 87?
Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. c
Game over. Your secret number was: 87

然后我的程序如下：
print "Please think of a number between 0 and 100!"
high=100
low=0
p=(low + high) / 2
print "Is your secret number" + p +"?"
i=raw_input("Enter 'h' to indicate the guess is too high.Enter 'l' to indicate the guess is too low. Enter 'c'to indicate I guessed correctly.")
while i!='c':
if i=='h':
high = p
elif i=='l':
low = p
else :
print "Sorry, I did not understand your input."
p=(high + low) / 2
print "Is your secret number" + p +"?"
i=raw_input("Enter 'h' to indicate the guess is too high.Enter 'l' to indicate the guess is too low. Enter 'c'to indicate I guessed correctly.")

print "Game over. Your secret number was:"+ p

可是我运行时出了错误：TypeError: cannot concatenate 'str' and 'int' objects

ERROR: Failing on first line.

我不懂，求问我要怎么改呢(T^T)

Answer 1

Python allow to concatenate strings by '+', but here, your p is an integer.

So, to solve it, you can use either of these:

1. print 'Is your secret number " + str(p) + "?"
2. print 'Is your secret number %d?"%p
(for multiple integers, you can '%d %d %d'%(num1, num2, num3)
3. print 'Is your secret number {0}?".format(p)

I personally like the second one best. It's more of c style, doesn't it?

Answer 2

python 组合字符串时不要用 a+b ，

应该是 print "Game over. Your secret number was:%s" % (p,)

全部改成这个模式

Answer 3

print "Is your secret number" + p +"?"
前面是string，p是int，不能相加，要用
print "Is your secret number" + str(p) +"?"
可以加qq讨论

追问

呃……我很少上QQ……其实后来这道题我想出来了，我也是像你这样写的……只不过3楼的亲写的更完整……抱歉啦……