Question

mystring= 'Fred enters the swamp and picks up %s to eat later.'
food1= 'python'
food2 = 'swamp apples'
print(mystring % (food1, food2))
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    print(mystring % (food1, food2))
TypeError: not all arguments converted during string formatting

命令'print（mystring％（food1，food2））'我不明白为什么它会说TypeError？难道它不应该打印为'弗雷德进入沼泽地并捡起蟒蛇和沼泽苹果以后再吃'??

Answer 1

因为字符串中只有一个%s，而您正在尝试在

中分配两个值

print(mystring % (food1, food2))

将其更改为：

print(mystring % food1)

它打印得很好

Answer 2

以这种方式使用：

mystring= 'Fred enters the swamp and picks up %s to eat later.'
food1= 'python'
food2 = 'swamp apples'
print(mystring % (food1 + ' and ' + food2))

输出：

Fred enters the swamp and picks up python and swamp apples to eat later.

示例代码的输出有问题

2 个答案:

Demo