>>> print (0.05 + 0.05 == 0.1)
True

>>> aa = 0.0
>>> for i in range(1000):
    aa += 0.0001
    print(repr(aa)) 

0.0001
0.0002
0.00030000000000000003

...

0.09980000000000183
0.09990000000000183
0.10000000000000184

>>> print (aa == 1.0)
False

>>> from decimal import Decimal 
>>> b = Decimal("0.0")
>>> for i in range(1000):
    b += Decimal("0.001")
    print(repr(b))
    
Decimal('0.001')
...
Decimal('1.000') 
>>> print(b == Decimal("1.0"))
True