Python repr method tutorial for object-oriented programming

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Catalogue

Why do you talk about _ _ repr__

Override the _ _ repr__ method

The difference between str () and repr ()

Why do you talk about _ _ repr__

In Python, print an instance object directly. The default is to output the object created by which class and the address in memory (hexadecimal representation).

Assuming that during development and debugging, when you want to use print instance objects and output custom content, you can use the _ _ repr__ method

Or calling the object through repr () will also return the value returned by the _ _ repr__ method

Is it deja vu. That's right. Feel the same code as _ _ str__ Chestnut

Class A: pass def _ repr__ (self): a = A () print (a) print (repr (a)) print (str (a)) # output result

By default, _ _ repr__ () returns information about the instance object

Override the _ _ repr__ method class PoloBlog: def _ _ init__ (self): self.name = "small pineapple" self.add = "https://www.cnblogs.com/poloyy/" def _ repr__ (self): return" test [name= "+ self.name +" Add= "+ self.add +"] "blog = PoloBlog () print (blog) print (str (blog)) print (repr (blog)) # output result test [name= pineapple, add= https://www.cnblogs.com/poloyy/]test[name= pineapple, add= https://www.cnblogs.com/poloyy/]test[name= pineapple, add= https://www.cnblogs.com/poloyy/]

Only override the _ _ repr__ method, which will also take effect when you use str ()

Class PoloBlog: def _ init__ (self): self.name = "https://www.cnblogs.com/poloyy/" def _ str__ (self): return" test [name= "+ self.name +", add= "+ self.add +"] "blog = PoloBlog () print (blog) print (str (blog)) print (repr (blog)) # output result test [name= Little Pineapple Add= https://www.cnblogs.com/poloyy/]test[name= pineapple, add= https://www.cnblogs.com/poloyy/]

If you only override the _ _ str__ method, using repr () won't work!

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