Python - Pass by Assignment
12345678910111213141516171819202122232425262728293031323334353637383940414243
'''
Python is an interesting language in that it passes mutable types by reference
and immutable types by value.
Variables that are assigned a mutable object (lists, user-defined classes) contain
a pointer (reference) to that object. Any changes made to the variable are
reflected in the original object and all pointers pointing to the object.
Variables that contain an immutable-type object can have their value changed,
but those changes are not reflected in the original object.
'''
'''
Mutable
> Since a is mutable, b and c simply contain pointers to a.
'''
class a:
def __init__(self, n):
self.n = n
b = a(1)
c = b
b.n = 2
c.n = 3
print(b.n == c.n) # should return True
'''
Immutable
> Since int is an immutable type, changing e to 2 would change the value of 1
> itself, which would break everything. e and d contain the value 1, and each
> variable can be remapped to contain a different value.
'''
d = 1
e = d
e = 2
print(d == e) # should return False
Python
INFO