Python 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:45:13) [MSC v.1600 64 bit (AMD64)] on win32
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>>> ============================================================== RESTART ==============================================================
>>> 
>>> def fib(n):
	result = []
	a, b = 0, 1
	while a < n:
		result.append(a)
		a, b = b, a+b
	return result

>>> fib(100)
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
>>> 
>>> result
Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    result
NameError: name 'result' is not defined
>>> result[3]
Traceback (most recent call last):
  File "<pyshell#6>", line 1, in <module>
    result[3]
NameError: name 'result' is not defined
>>> 
>>> 
>>> def fib(n):
	result = []
	results = []
	a, b = 0, 1
	while a < n:
		result.append(a)
		results = result
		a, b = b, a+b
	return result

>>> fib(100)
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
>>> results
Traceback (most recent call last):
  File "<pyshell#12>", line 1, in <module>
    results
NameError: name 'results' is not defined
>>> results[4]
Traceback (most recent call last):
  File "<pyshell#13>", line 1, in <module>
    results[4]
NameError: name 'results' is not defined
>>> 
>>> 
>>> def fib(n):
	result = []
	results = []
	a, b = 0, 1
	while a < n:
		result.append(a)
		results = result
		a, b = b, a+b
		print(result)
		print(results)
	return result

>>> fib(100)
[0]
[0]
[0, 1]
[0, 1]
[0, 1, 1]
[0, 1, 1]
[0, 1, 1, 2]
[0, 1, 1, 2]
[0, 1, 1, 2, 3]
[0, 1, 1, 2, 3]
[0, 1, 1, 2, 3, 5]
[0, 1, 1, 2, 3, 5]
[0, 1, 1, 2, 3, 5, 8]
[0, 1, 1, 2, 3, 5, 8]
[0, 1, 1, 2, 3, 5, 8, 13]
[0, 1, 1, 2, 3, 5, 8, 13]
[0, 1, 1, 2, 3, 5, 8, 13, 21]
[0, 1, 1, 2, 3, 5, 8, 13, 21]
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
>>> 
>>> print(result)
Traceback (most recent call last):
  File "<pyshell#20>", line 1, in <module>
    print(result)
NameError: name 'result' is not defined
>>> print(results)
Traceback (most recent call last):
  File "<pyshell#21>", line 1, in <module>
    print(results)
NameError: name 'results' is not defined
>>> 
>>> 
>>> z = [0, 1, 2, 3, 4, 5]
>>> z
[0, 1, 2, 3, 4, 5]
>>> print(z)
[0, 1, 2, 3, 4, 5]
>>> z[3]
3
>>> z.append(6)
>>> z
[0, 1, 2, 3, 4, 5, 6]
>>> y = z
>>> y
[0, 1, 2, 3, 4, 5, 6]
>>> y[4]
4
>>> print(y)
[0, 1, 2, 3, 4, 5, 6]
>>>