odd-2% vi x.py
odd-2% python x.py
Traceback (most recent call last):
  File "x.py", line 28, in <module>
    tk.mainloop()
NameError: name 'tk' is not defined
odd-2% !vi
vi x.py
odd-2% python x.py
Fatal Python error: PyEval_RestoreThread: NULL tstate
zsh: abort      python x.py
odd-2% vi x.py    
odd-2% ipython
Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
Type "copyright", "credits" or "license" for more information.

IPython 0.10.2 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: a=[1,2,5,6,8,10]

In [2]: a=[1,2,"abc",[1,2,3],{1:5,3:4}]

In [3]: a
Out[3]: [1, 2, 'abc', [1, 2, 3], {1: 5, 3: 4}]

In [4]: from cPickle import *

In [5]: a
Out[5]: [1, 2, 'abc', [1, 2, 3], {1: 5, 3: 4}]

In [6]: dumps(a)
Out[6]: "(lp1\nI1\naI2\naS'abc'\np2\na(lp3\nI1\naI2\naI3\naa(dp4\nI1\nI5\nsI3\nI4\nsa."

In [7]: b=dumps(a)

In [8]: b
Out[8]: "(lp1\nI1\naI2\naS'abc'\np2\na(lp3\nI1\naI2\naI3\naa(dp4\nI1\nI5\nsI3\nI4\nsa."

In [9]: c=loads(b)

In [10]: c
Out[10]: [1, 2, 'abc', [1, 2, 3], {1: 5, 3: 4}]

In [11]: f=file("z.txt","w")

In [12]: f.write(b)

In [13]: exit()
Do you really want to exit ([y]/n)? y
odd-2% 
odd-2% ipython
Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
Type "copyright", "credits" or "license" for more information.

IPython 0.10.2 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: a
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

NameError: name 'a' is not defined

In [2]: from cPickle import *

In [3]: a=file("z.txt","r").read()

In [4]: a
Out[4]: "(lp1\nI1\naI2\naS'abc'\np2\na(lp3\nI1\naI2\naI3\naa(dp4\nI1\nI5\nsI3\nI4\nsa."

In [5]: b=loads(a)

In [6]: b
Out[6]: [1, 2, 'abc', [1, 2, 3], {1: 5, 3: 4}]

In [7]: a=file("z.txt","r")

In [8]: c=load(a)

In [9]: c
Out[9]: [1, 2, 'abc', [1, 2, 3], {1: 5, 3: 4}]

In [10]: a=file("zz.txt","w")

In [11]: dump(a,c)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

TypeError: argument must have 'write' attribute

In [12]: dump(c,a)

In [13]: dump(c,a)

In [14]: dump(c,a)

In [15]: 
Do you really want to exit ([y]/n)? 
odd-2% ipython
Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
Type "copyright", "credits" or "license" for more information.

IPython 0.10.2 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: a=file("zz.txt","r")

In [2]: b=load(a)
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

NameError: name 'load' is not defined

In [3]: from cP
cPickle   cProfile  

In [3]: from cPickle import *

In [4]: b=load(a)

In [5]: c=load(a)

In [6]: d=load(a)

In [7]: e=load(a)
---------------------------------------------------------------------------
EOFError                                  Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

EOFError: 

In [8]: b
Out[8]: [1, 2, 'abc', [1, 2, 3], {1: 5, 3: 4}]

In [9]: c
Out[9]: [1, 2, 'abc', [1, 2, 3], {1: 5, 3: 4}]

In [10]: d
Out[10]: [1, 2, 'abc', [1, 2, 3], {1: 5, 3: 4}]

In [11]: 
Do you really want to exit ([y]/n)? 
odd-2% ipython
Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
Type "copyright", "credits" or "license" for more information.

IPython 0.10.2 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: class student:
   ...:     def __init__():
   ...:         self.name=None
   ...:         self.zip=None
   ...:         self.id=None
   ...:         
   ...:         

In [2]: a=student()
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

TypeError: __init__() takes no arguments (1 given)

In [3]: class student:
    def __init__(self):
        self.name=None
        self.zip=None
        self.id=None
   ...:         
   ...:         

In [8]: a=student()

In [9]: a.name="steve"

In [10]: a.zip=77584

In [11]: a.id=120110

In [12]: a
Out[12]: <__main__.student instance at 0x10dcd7a28>

In [13]: dir(a)
Out[13]: ['__doc__', '__init__', '__module__', 'id', 'name', 'zip']

In [14]: a.name
Out[14]: 'steve'

In [15]: a
Out[15]: <__main__.student instance at 0x10dcd7a28>

In [16]: from cPickle import *

In [17]: b=file("zz.txt","w")

In [18]: dump(a,b)

In [19]: 
Do you really want to exit ([y]/n)? 
odd-2% ipython
Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
Type "copyright", "credits" or "license" for more information.

IPython 0.10.2 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: from cPickle import *

In [2]: b=file("zz.txt","r")

In [3]: a=load(b)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

AttributeError: 'FakeModule' object has no attribute 'student'

In [4]: class student:
   ...:         
KeyboardInterrupt

In [4]: class student:
   ...:     ""
   ...:     
   ...:     

In [6]: b.rewind()
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

AttributeError: 'file' object has no attribute 'rewind'

In [7]: b.seek(0)

In [8]: a=load(b)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

AttributeError: 'FakeModule' object has no attribute 'student'

In [9]: 

In [10]: import anydbm

In [11]: a=[1,2,3,"abc",[1,2,4]]

In [12]: 

In [13]: a
Out[13]: [1, 2, 3, 'abc', [1, 2, 4]]

In [14]: o=anydbm.open("zzz","c")

In [15]: o
Out[15]: <dbm.dbm object at 0x1094404d0>

In [16]: o["a"]="abcdefg"

In [17]: o
Out[17]: <dbm.dbm object at 0x1094404d0>

In [18]: o["a"]
Out[18]: 'abcdefg'

In [19]: 
Do you really want to exit ([y]/n)? 
odd-2% ipython
Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
Type "copyright", "credits" or "license" for more information.

IPython 0.10.2 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: import anydbm

In [2]: o=anydbm.open("zzz","c")

In [3]: o["a"]
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

KeyError: 'a'

In [4]: a=[1,2,3,"abc",[1,2,4]]

In [5]: o["a"]="abcd"

In [6]: a["a"]
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

TypeError: list indices must be integers, not str

In [7]: o[a]
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

TypeError: argument must be string or read-only buffer, not list

In [8]: o["a"]
Out[8]: 'abcd'

In [9]: o.close()

In [10]: 
Do you really want to exit ([y]/n)? 
odd-2% ipython
Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
Type "copyright", "credits" or "license" for more information.

IPython 0.10.2 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: import anydbm

In [2]: o=anydbm.open("zzz","c")

In [3]: o["a"]
Out[3]: 'abcd'

In [4]: a=[1,2,3,"abc",[1,2,4]]

In [5]: o["b"]=a
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

TypeError: dbm mappings have string elements only

In [6]: from cPickle import *

In [7]: o["b"]=dumps(a)

In [8]: o["b"]
Out[8]: "(lp1\nI1\naI2\naI3\naS'abc'\np2\na(lp3\nI1\naI2\naI4\naa."

In [9]: loads(o["b"])
Out[9]: [1, 2, 3, 'abc', [1, 2, 4]]

In [10]: import shelve

In [11]: help(shelve)


In [12]: p=shelve.open("zzzz.db")

In [13]: p[1]=10
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/Users/stevel/wp/lecture/2012_01_Intro_Programming/lec12/<ipython console> in <module>()

/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shelve.pyc in __setitem__(self, key, value)
    131         p = Pickler(f, self._protocol)
    132         p.dump(value)
--> 133         self.dict[key] = f.getvalue()
    134 
    135     def __delitem__(self, key):

TypeError: dbm mappings have string indices only

In [14]: p["1"]=10

In [15]: p["2"]=a

In [16]: p["2"]
Out[16]: [1, 2, 3, 'abc', [1, 2, 4]]

In [17]: p.close()

In [18]: 
Do you really want to exit ([y]/n)? 
odd-2% ipython
Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
Type "copyright", "credits" or "license" for more information.

IPython 0.10.2 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: from cP
cPickle   cProfile  

In [1]: import shelve

In [2]: p=shelve.open("zzzz.db")

In [3]: p["1"]
Out[3]: 10

In [4]: p["2"]
Out[4]: [1, 2, 3, 'abc', [1, 2, 4]]

In [5]: 
Do you really want to exit ([y]/n)?