sbs5@cobra:~/cs200/www/lectures$ date
Mon Oct 21 02:29:35 PM EDT 2024
sbs5@cobra:~/cs200/www/lectures$ pwd
/home/accts/sbs5/cs200/www/lectures
sbs5@cobra:~/cs200/www/lectures$ p
Python 3.10.12 (main, Sep 11 2024, 15:47:36) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 

x = 'x = {!r};print(x.format(x))';print(x.format(x))
>>> >>> x = 'x = {!r};print(x.format(x))';print(x.format(x))
>>> 

x = 'x = {!r};print(x.format(x))';print(x.format(x))
>>> >>> x = 'x = {!r};print(x.format(x))';print(x.format(x))
>>> from stack import *
>>> l = [1,2,3]
>>> l.pop()
3
>>> l
[1, 2]
>>> l[1], l[0] = l[0], l[1]
>>> l
[2, 1]
>>> help(stack)
Help on class stack in module stack:

class stack(builtins.object)
 |  stack(items=[])
 |  
 |  ## a common use of classes is to implement data structures
 |  ## this is an example of a stack,
 |  ## which is a LIFO - last in first out - structure
 |  ## it is a collection.
 |  ## items are added to the stack with push and removed with pop
 |  ## -----------------------------------------------------------
 |  ## we will see that the python virtual machine for interpreting
 |  ## byte code is based on a stack architecture.
 |  ## -----------------------------------------------------------
 |  
 |  Methods defined here:
 |  
 |  __eq__(self, other)
 |      Return self==value.
 |  
 |  __init__(self, items=[])
 |      Initialize self.  See help(type(self)) for accurate signature.
 |  
 |  __iter__(self)
 |      Return iterator for the stack.
 |  
 |  __repr__(self)
 |      Return repr(self).
 |  
 |  copy(self)
 |      # copy constructor - clone the current instance
 |  
 |  isEmpty(self)
 |  
 |  peek(self)
 |  
 |  pop(self)
 |  
 |  push(self, item)
 |  
 |  rotate(self)
 |      ## swap the top two items in the stack
 |  
 |  ----------------------------------------------------------------------
 |  Data descriptors defined here:
 |  
 |  __dict__
 |      dictionary for instance variables (if defined)
 |  
 |  __weakref__
 |      list of weak references to the object (if defined)
 |  
 |  ----------------------------------------------------------------------
 |  Data and other attributes defined here:
 |  
 |  __hash__ = None

>>> s
stack([1, 2, 3, 4])
>>> s.size
4
>>> s.isempty()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'stack' object has no attribute 'isempty'. Did you mean: 'isEmpty'?
>>> s.isEmpty()
False
>>> s.peek()
4
>>> s
stack([1, 2, 3, 4])
>>> s.pop()
4
>>> s
stack([1, 2, 3])
>>> s.isEmpty()
False
>>> s.rotate()
>>> s
stack([1, 3, 2])
>>> s.rotate()
>>> s
stack([1, 2, 3])
>>> type(s)
<class 'stack.stack'>
>>> s2 = s.copy()
>>> s == s2
True
>>> id(s)
127264401688320
>>> id(s2)
127264405399840
>>> s is s2
False
>>> s is not s2
True
>>> test(s)
3
2
1
[3, 2, 1]
>>> s
stack([1, 2, 3])
>>> s.rotate()
>>> s
stack([1, 3, 2])
>>> test(s)
2
3
1
[2, 3, 1]
>>> revstr('abcdef')
'fedcba'
>>> 'abcdef'[::-1]
'fedcba'
>>> 
sbs5@cobra:~/cs200/www/lectures$ cd /c/cs200/hws
sbs5@cobra:/c/cs200/hws$ ls
hw0a.pyc  hw1.py    hw3a.pyc  hw4.py
hw0.py	  hw2a.pyc  hw3.py    __pycache__
hw1a.pyc  hw2.py    hw4a.pyc
sbs5@cobra:/c/cs200/hws$ p
Python 3.10.12 (main, Sep 11 2024, 15:47:36) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import hw4a
>>> hw4a.balanced
<function balanced at 0x7b96dd6fedd0>
>>> hw4a.balanced('()')
True
>>> hw4a.balanced('())')
False
>>> hw4a.balanced('()()')
True
>>> hw4a.balanced('())(')
False
>>> hw4a.balanced('()(xxxx)')
True
>>> hw4a.balanced('ajajaj')
True
>>> hw4a.balanced('ajajaj)')
False
>>> q
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'q' is not defined
>>> hw4a.q
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'hw4a' has no attribute 'q'. Did you mean: 'q2'?
>>> hw4a.q2
queue2(stack([4, 5, 6]), stack([3, 2, 1]))
>>> q = queue()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'queue' is not defined
>>> q = hw4a.queue()
>>> q
queue([])
>>> dir(q)
['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__iter__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'copy', 'data', 'dequeue', 'enqueue', 'isempty', 'peek', 'size']
>>> q.size
0
>>> q.enqueue(1)
>>> q
queue([1])
>>> q.enqueue(2)
>>> q.enqueue(3)
>>> q.enqueue(4)
>>> q
queue([1, 2, 3, 4])
>>> str(q)
'queue([1, 2, 3, 4])'
>>> repr(q)
'queue([1, 2, 3, 4])'
>>> q.peek()
1
>>> q.dequeue()
1
>>> q.dequeue()
2
>>> q.dequeue()
3
>>> q
queue([4])
>>> q.peek()
4
>>> q.dequeue()
4
>>> q
queue([])
>>> q.peek()
'queue is empty'
>>> q.dequeue()
'queue is empty'
>>> q.enqueue(2)
>>> q.enqueue(1
... )
>>> q.enqueue(3)
>>> q.enqueue(4)
>>> q
queue([2, 1, 3, 4])
>>> test
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'test' is not defined
>>> hw4a.text
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'hw4a' has no attribute 'text'. Did you mean: 'test'?
>>> hw4a.test
<function test at 0x7b96dd4d8940>
>>> hw4a.test(q)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: test() missing 1 required positional argument: 'expected'
>>> q2 = q.copy()
>>> q2
queue([2, 1, 3, 4])
>>> q
queue([2, 1, 3, 4])
>>> q == q2
True
>>> id(q)
135887890378720
>>> id(q2)
135887890378816
>>> q is q2
False
>>> q is not q2
True
>>> for i in q:
...   print (i)
... 
2
1
3
4
>>> [x for x in q]
[2, 1, 3, 4]
>>> q
queue([2, 1, 3, 4])
>>> q2
queue([2, 1, 3, 4])
>>> q2 = hw4a.queue2()
>>> q2
queue2(stack([]), stack([]))
>>> q2.enqueue(1)
>>> q2.enqueue(2)
>>> q2.enqueue(3)
>>> q2
queue2(stack([1, 2, 3]), stack([]))
>>> q2.peek()
1
>>> q
queue([2, 1, 3, 4])
>>> q2
queue2(stack([]), stack([3, 2, 1]))
>>> q2.pop()q
  File "<stdin>", line 1
    q2.pop()q
            ^
SyntaxError: invalid syntax
>>> q2.dequeue()
1
>>> q2
queue2(stack([]), stack([3, 2]))
>>> q2.dequeue()
2
>>> q2
queue2(stack([]), stack([3]))
>>> q2.enqueue(4)
>>> q4
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'q4' is not defined. Did you mean: 'q'?
>>> q2
queue2(stack([4]), stack([3]))
>>> q2.dequeue()
3
>>> q2
queue2(stack([4]), stack([]))
>>> q2.peek()
4
>>> q2
queue2(stack([]), stack([4]))
>>> q2.isempty()
False
>>> q2.dequeue()
4
>>> q2
queue2(stack([]), stack([]))
>>> q2.isempty()
True
>>> command dirs
  File "<stdin>", line 1
    command dirs
            ^^^^
SyntaxError: invalid syntax
>>> q2.enqueue(4)
>>> q2.enqueue(3)
>>> q2.enqueue(2)
>>> q2.enqueue(1)
>>> q2
queue2(stack([4, 3, 2, 1]), stack([]))
>>> for i in q2:
...   print (i)
... 
4
3
2
1
>>> [x for x in q2]
[4, 3, 2, 1]
>>> q2
queue2(stack([4, 3, 2, 1]), stack([]))
>>> q2
queue2(stack([4, 3, 2, 1]), stack([]))
>>> q3 = q2.copy()
>>> q3
queue2(stack([4, 3, 2, 1]), stack([]))
>>> q2 == q2
True
>>> q3.peek()
4
>>> q3
queue2(stack([]), stack([1, 2, 3, 4]))
>>> q2
queue2(stack([4, 3, 2, 1]), stack([]))
>>> q2 == q3
True
>>> q2
queue2(stack([4, 3, 2, 1]), stack([]))
>>> q3
queue2(stack([]), stack([1, 2, 3, 4]))
>>> q2
queue2(stack([4, 3, 2, 1]), stack([]))
>>> hw4a.reverse(q2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'hw4a' has no attribute 'reverse'. Did you mean: 'reverseq'?
>>> hw4a.reverseq(q2)
queue2(stack([1, 2, 3, 4]), stack([]))
>>> hw4a.reverseq(q2)
queue2(stack([4, 3, 2, 1]), stack([]))
>>> q3
queue2(stack([]), stack([1, 2, 3, 4]))
>>> hw4a.reverseq(q3)
queue2(stack([1, 2, 3, 4]), stack([]))
>>> q
queue([2, 1, 3, 4])
>>> hw4a.reverseq(q)
queue([4, 3, 1, 2])
>>> d = {}
>>> d['a'] = 'alpha'
>>> d
{'a': 'alpha'}
>>> d['a'] 
'alpha'
>>> 
sbs5@cobra:/c/cs200/hws$ exit

Process shell finished