What are Immutable and Mutable types in Python? List immutable and mutable types of Python.

The complex numbers have two parts : real and imaginary. In which data type are real and imaginary parts represented ?

How are these numbers different from one another (with respect to Python)? 33, 33.0, 33j, 33 + j

What will following code print?

str1 = '''Hell
o'''
str2 = '''Hell\
o'''
print(len(str1) > len(str2))