Detailed Explanation of Python Object Oriented Programming repr Method Example

Why does the directory tell the difference between __repr__ overriding __repr__ methods str () and repr ()

Why do you want to talk about __repr__

In Python, direct print 1 instance object, the default is to output the object created by which class, and the address in memory (106-ary representation)

Assuming that you want to output custom content when you use an print instance object during development and debugging, 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... and __str__1-like feeling code chestnut

class A:
    pass
 
    def __repr__(self): 
a = A()
print(a)
print(repr(a))
print(str(a))  
#  Output result 
<__main__.A object at 0x10e6dbcd0>
<__main__.A object at 0x10e6dbcd0>
<__main__.A object at 0x10e6dbcd0>

By default, __repr__ () returns and instances the object < Class name object at memory address > Relevant information

Override __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= Small pineapple ,add=https://www.cnblogs.com/poloyy/]
test[name= Small pineapple ,add=https://www.cnblogs.com/poloyy/]
test[name= Small pineapple ,add=https://www.cnblogs.com/poloyy/]

Override only the __repr__ method, which will also take effect when using str ()

class PoloBlog:
    def __init__(self):
        self.name = " Small pineapple "
        self.add = "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= Small pineapple ,add=https://www.cnblogs.com/poloyy/]
test[name= Small pineapple ,add=https://www.cnblogs.com/poloyy/]
<__main__.PoloBlog object at 0x10e2749a0>

If you only override the __str__ method, using repr () will not take effect!

Differences between str () and repr ()

https://www.ofstack.com/article/64333.htm

The above is Python object-oriented programming repr method example details, more about Python object-oriented programming repr information please pay attention to other related articles on this site!