Python I'；我试图格式化字符串，但它生成了AttributeError

下面是一段代码

def lyrics(animal, sound):

    print('''Old MacDonald had a farm, Ee-igh, Ee-igh, Oh!
And on that farm he had a {1}, Ee-igh, Ee-igh, Oh!
With a {2}, {2} here and a {2}, {2} there.
Here a {2}, there a {2}, everywhere a {2}, {2}.
Old MacDonald had a farm, Ee-igh, Ee-igh, Oh!''').format(animal, sound)

这就是错误信息

File "c6e1.py", line 19, in main
    lyrics("buffalo", "boo")
  File "c6e1.py", line 16, in lyrics
    Old MacDonald had a farm, Ee-igh, Ee-igh, Oh!''').format(animal, sound)
AttributeError: 'NoneType' object has no attribute 'format'

请帮忙

试试这个：

def lyrics(animal, sound):

    print('''Old MacDonald had a farm, Ee-igh, Ee-igh, Oh!
And on that farm he had a {0}, Ee-igh, Ee-igh, Oh!
With a {1}, {1} here and a {1}, {1} there.
Here a {1}, there a {1}, everywhere a {1}, {1}.
Old MacDonald had a farm, Ee-igh, Ee-igh, Oh!'''.format(animal, sound))

print（“'any_string”“”）

将返回

NoneType

，您无法对其进行字符串格式化。您需要执行

打印（“'any_string”“”）.fomrat（格式化程序））

---

注意：在上面的函数中使用类似于

.format（）

的位置参数会产生另一个错误，因为它的索引从

0

开始。首先，在print（）的返回值上调用format函数，该函数为None。必须在括号内的字符串上调用它。

---

其次，format（）参数的索引是基于零的，因此您需要对它们进行良好的调整。

来自python 3.6，而且您还可以使用

f-strings

def lyrics(animal, sound):

    print(f'''Old MacDonald had a farm, Ee-igh, Ee-igh, Oh!
And on that farm he had a {animal}, Ee-igh, Ee-igh, Oh!
With a {sound}, {sound} here and a {sound}, {sound} there.
Here a {sound}, there a {sound}, everywhere a {sound}, {sound}.
Old MacDonald had a farm, Ee-igh, Ee-igh, Oh!''')

---

format（）

调用需要直接在字符串后面，在

print（）括号内找到它，谢谢