python 3.6 how does str affect print()

Question

I have defined a class foo and a function foo.__str__(). If x is an instance of foo, x.__str__() returns a string representation of x. I have checked this on examples and it seems to work as I wish it to.

My question is, how to I now define foo.print(). Am I supposed to use __str__ or, annoyingly, repeat the code of __str__?

also: override `__repl__` - it is used if you do `print( [i1,i2,i3,i4]) ` multiple instances of your class inside a list — Patrick Artner, Jan 06 '19 at 17:32

JoshuaCS · Accepted Answer · 2019-01-06T17:47:06.497

3

No, print just calls __str__, so you dont need to do anything else. You probably will also need to define __repr__, which returns the representation of the object

Code

class A:
    def __str__(self):
        return 'in __str__'

    def __repr__(self):
        return 'in __repr__'

a = A()

print(a) # __str__
print([a]) # __repr__

Output

Look at this post about __str__ vs __repr__

edited Jan 06 '19 at 17:47

answered Jan 06 '19 at 17:33

JoshuaCS

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But when I did x.print() I got an error message saying that x had no method print – David Epstein Jan 06 '19 at 17:36
2

you `print(object)` .. not `object.print()` - see my comment wich tells you about the same as this answer – Patrick Artner Jan 06 '19 at 17:37
@DavidEpstein Why are you trying to call `print` as though it's a method of the class? – Carcigenicate Jan 06 '19 at 17:38

python 3.6 how does __str__ affect print()

1 Answers1

Code

Output

python 3.6 how does str affect print()