What a noncense ?

Question

class Car:

def __str__(self):
return str (self. model)

m3 = Car( )
m3.model = "bmw"
----------------------------------------

print (m3)
>>output: bmw
# "bmw" printed as a string

print ("my_" + (m3))
>>output: TypeError must be str, not Car
#Why this happens?
# Why now operation: "my_" + "bmw" doesn't exist?

Answer 1

m3 isn't a string type, but a class instance. It has a string representation that can be called with str() (or repr())

Answer 2

I thought firstly noncense is a Python component

Answer 3

print("my " + str(m3))

Answer 4

i now, but why it is necessary to write: str (m3)), if just already (m3) is string type??