python中的%r、%s和%d有什么区别？
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What's the difference between %r, %s and %d in python?
提问by mahr
Well, i just always use %r on python, but I don't know when I have to use these other formats...
好吧，我总是在 python 上使用 %r，但我不知道什么时候必须使用这些其他格式......
采纳答案by James Henstridge
This is explained in the Python documentation. In short,
%dwill format a number for display.%swill insert the presentation string representation of the object (i.e.str(o))%rwill insert the canonical string representation of the object (i.e.repr(o))
%d将格式化一个数字以供显示。%s将插入对象的表示字符串表示（即str(o)）%r将插入对象的规范字符串表示（即repr(o)）
If you are formatting an integer, then these are equivalent. For most objects this is not the case.
如果您正在格式化一个整数，那么这些是等效的。对于大多数对象，情况并非如此。
回答by unutbu
Here is an example to supplement James Henstridge's answer:
以下是补充 James Henstridge 回答的示例：
class Cheese(float):
def __str__(self):
return 'Muenster'
def __repr__(self):
return 'Stilton'
chunk = Cheese(-123.4)
print(str(chunk))
# Muenster
print(repr(chunk))
# Stilton
print(int(chunk))
# -123
print('%s\t%r\t%d'%(chunk, chunk, chunk))
# Muenster Stilton -123
