Difference between __str__ and __repr__ in Python

First, let me reiterate the main points in Alex’s post:
• The default implementation is useless (it’s hard to think of one which wouldn’t be, but yeah)
• repr goal is to be unambiguous
• str goal is to be readable
• Container’s str uses contained objects’ repr
Default implementation is useless
This is mostly a surprise because Python’s defaults tend to be fairly useful. However, in this case, having a default for repr which would act like:
return “%s(%r)” % (self.class, self.dict)
would have been too dangerous (for example, too easy to get into infinite recursion if objects reference each other). So Python cops out. Note that there is one default which is true: if __repr__is defined, and str is not, the object will behave as though str=repr.
This means, in simple terms: almost every object you implement should have a functional __repr__that’s usable for understanding the object. Implementing str is optional: do that if you need a “pretty print” functionality (for example, used by a report generator).
The goal of repr is to be unambiguous
Let me come right out and say it — I do not believe in debuggers. I don’t really know how to use any debugger, and have never used one seriously. Furthermore, I believe that the big fault in debuggers is their basic nature — most failures I debug happened a long long time ago, in a galaxy far far away. This means that I do believe, with religious fervor, in logging. Logging is the lifeblood of any decent fire-and-forget server system. Python makes it easy to log: with maybe some project specific wrappers, all you need is a
log(INFO, “I am in the weird function and a is”, a, “and b is”, b, “but I got a null C — using default”, default_c)
But you have to do the last step — make sure every object you implement has a useful repr, so code like that can just work. This is why the “eval” thing comes up: if you have enough information so eval(repr©)==c, that means you know everything there is to know about c. If that’s easy enough, at least in a fuzzy way, do it. If not, make sure you have enough information about canyway. I usually use an eval-like format: “MyClass(this=%r,that=%r)” % (self.this,self.that). It does not mean that you can actually construct MyClass, or that those are the right constructor arguments — but it is a useful form to express “this is everything you need to know about this instance”.
Note: I used %r above, not %s. You always want to use repr() [or %r formatting character, equivalently] inside repr implementation, or you’re defeating the goal of repr. You want to be able to differentiate MyClass(3) and MyClass(“3”).
The goal of str is to be readable
Specifically, it is not intended to be unambiguous — notice that str(3)==str(“3”). Likewise, if you implement an IP abstraction, having the str of it look like 192.168.1.1 is just fine. When implementing a date/time abstraction, the str can be “2010/4/12 15:35:22”, etc. The goal is to represent it in a way that a user, not a programmer, would want to read it. Chop off useless digits, pretend to be some other class — as long is it supports readability, it is an improvement.
Container’s str uses contained objects’ repr
This seems surprising, doesn’t it? It is a little, but how readable would
[moshe is, 3, hello
world, this is a list, oh I don’t know, containing just 4 elements]
be? Not very. Specifically, the strings in a container would find it way too easy to disturb its string representation. In the face of ambiguity, remember, Python resists the temptation to guess. If you want the above behavior when you’re printing a list, just
print “[” + ", ".join(l) + “]”
(you can probably also figure out what to do about dictionaries.
Summary
Implement repr for any class you implement. This should be second nature. Implement str if you think it would be useful to have a string version which errs on the side of more readability in favor of more ambiguity.