Mojo trait
Stringable
The Stringable trait describes a type that can be converted to a String.
Any type that conforms to Stringable or
StringableRaising works
with the built-in print() and
str() functions.
The Stringable trait requires the type to define the __str__() method.
For example:
@value
struct Foo(Stringable):
var s: String
fn __str__(self) -> String:
return self.s
@value
struct Foo(Stringable):
var s: String
fn __str__(self) -> String:
return self.s
Now you can pass an instance of Foo to the str() function to get back a
String:
var foo = Foo("test")
print(str(foo) == "test")
var foo = Foo("test")
print(str(foo) == "test")
True
True
Note: If the __str__() method might raise an error, use the
StringableRaising
trait, instead.
About the difference between __repr__() and __str__():
The method __repr__ compute the compute the "official" string representation of an object
while __str__ computes the "informal" or nicely printable string representation of an object.
This method differs from __repr__() in that there is no expectation that __str__()
return a valid Mojo expression: a more convenient or concise representation can be used.
Implemented traits
AnyType,
UnknownDestructibility
Methods
__str__
__str__(self: _Self) -> String
Get the string representation of the type.
Returns:
The string representation of the type.
Was this page helpful?
Thank you! We'll create more content like this.
Thank you for helping us improve!