I'm creating a class that prints out its contents using the str() function. However, I can only seem to be able to get it to print out one of the parameters? When I ask it to return self.num as well as self.word it throws an error.
Would anyone be able to help me on this?
class Test:
def __init__ (self, word, num):
self.word = word
self.num = num
def __str__(self):
return self.word, self.num
a = Test('Word', '10')
print(a)
The __str__ method is expected to return a single string. To show several variables, concatenate (via + if they are strings) or format them (via f-string literals, format string templates, or printf %-formatting) into a single string.
class Test:
def __init__ (self, word, num):
self.word = word
self.num = num
def __str__(self):
# f-string literal - ``{...}`` are replacement fields
return f'{self.word} => {self.num}'
a = Test('Word', '10')
print(a) # Word => 10
__str__ to return self.word + self.num. Note that you generally cannot concatenate other types to a string, for example 'Word' + 10 will not work (note that the 10 is not quoted - it is an integer number).
__str__must return a str; it cannot return a tuple. You'll have to create a string of them first.