类型错误：%d 格式：需要一个数字，而不是 str

Question

我想使用打印格式来打印字符串和数字，我 有以下代码：

John = {'strength': 10, 'skill': 10}
character1 = "John"
strength = eval(character1)['strength']
skill = eval(character1)['skill']
print " %d " % eval(character1)['strength']
print " %d " % strength
print "$s's strength is: %d, and $s's skill is: %d" % (character1, strength, character1, skill)
print "$s's strength is: %d, and $s's skill is: %d" % character1, eval(character1)['strength'], character1, eval(character1)['skill']

前两个打印我没有错误，他们打印 10，最后两个打印给我： “TypeError：%d 格式：需要一个数字，而不是 str”。

不明白为什么，请指点，谢谢！

Answer 1

这里的错误是：$s 应该是 %s。