2021年2月21日 · The returns of repr() and str() are identical for int x, but there's a difference between the return values for str y-- one is formal and the other is informal. One of the most important differences between the formal and informal representations is that the default implementation of __repr__ for a str value can be called as an argument to eval ...

repr actually calls a magic method __repr__ of x, which gives the string containing the representation of the value 'foo' assigned to x. So it returns 'foo' inside the string "" resulting in "'foo'" .

An actual repr will probably not be very helpful as the output of print([your, objects]). To qualify this, in my experience, the most useful use case of the repr function is to put a string inside another string (using string formatting). This way, you …

Called by the repr() built-in function and by string conversions (reverse quotes) to compute the "official" string representation of an object. If at all possible, this should look like a valid Python expression that could be used to recreate an object with the …

2010年9月21日 · repr(obj) calls. obj.__repr__ the purpose of __repr__ is that it provides a 'formal' representation of the object that is supposed to be a expression that can be evaled to create the object. that is,

I write this code: class Item: def __init__(self, name): self._name = name; def __str__(self): return "Item: %s" % self._name When I run print((Item("Car"),)) the ...

2013年3月12日 · If repr(A) were to just return 'A', that'd be meaningless. You are not recreating A , you'd just be referencing it then. "type('A', (object,), {})" would be closer to reflecting the class constructor, but that'd be a) confusing for people not familiar with the fact python classes are instances of type and b) never able to reflect methods and ...

2017年6月3日 · Called by the repr() built-in function to compute the “official” string representation of an object. If at all possible, this should look like a valid Python expression that could be used to recreate an object with the same value (given an appropriate environment) .

2021年1月30日 · For types that have a literal notation (str, int, float, list, etc.) the repr() returns a string that can be used to create the type again. That is nice , but not a requirement. The main purpose for __repr__ is to provide the developer with unambiguous information as to what object they have here, for debugging purposes.

2015年8月5日 · Called by the repr() built-in function and by string conversions (reverse quotes) to compute the “official” string representation of an object. If at all possible, this should look like a valid Python expression that could be used to recreate an object with the same value (given an appropriate environment).