Book Example Updates

We've found 4 examples in the book (and on the CD) that need to be updated. Three of the updates are required for non-backward-compatible changes in Python 1.4 (they still work fine under 1.3). The examples to be updated:

/dbase/formgui.py (Tk StringVars can't be called)
/lang/calcgui2.py (Tk StringVars can't be called)
/gui/guimixin.py (ScrolledText options change)
/other/tutor/func1.py (missing a comma in a tuple)

Example changes tar file

To fetch a tar file with just the updated examples, click here. Then do a "tar -xvf progdiff.tar" command to unpack the changed files on your machine.

Example diff listings


The following listings are 'diff' runs for all 4 examples to be changed.
In the listings, you'll see a series of entries that look like:

    XXXcYYY
    N  new line
    ---
    O  old line

where: 

    - the XXXcYYY gives the example's line number(s) to change
    - the "N" line gives the new contents (change to this)
    - the "O" line gives the old contents (change from this).  

See the errata page for more details about these 4 updates.




Changes for "formgui.py", example 12-2, page 394, errata #48


61c61
N         self.keytext.set(key)                   # change key in main box 
---
O         self.keytext(key)                       # change key in main box 
66c66
N                 text.set(`item[field]`)         # same fields? reuse form
---
O                 text(`item[field]`)             # same fields? reuse form
79c79
N                 text.set( `item[field]` )
---
O                 text( `item[field]` )
88c88
N         key = self.keytext.get()
---
O         key = self.keytext()
98c98
N                 item[field] = eval(text.get())  # convert back from string
---
O                 item[field] = eval(text())      # convert back from string
100c100
N                 self.errorbox('Bad data: "%s" = "%s"' % (field, text.get()))
---
O                 self.errorbox('Bad data: "%s" = "%s"' % (field, text()))
107c107
N         self.keytext.set('?%d' % len(self.index))  # default key unless typed
---
O         self.keytext('?%d' % len(self.index))      # default key unless typed
109c109
N             text.set('') 
---
O             text('') 
113c113
N         target = key or self.keytext.get()            # passed in, or entered
---
O         target = key or self.keytext()                # passed in, or entered




Changes for "calcgui2.py", example 16-19, page 688, errata #46


21c21
N         self.text.set("0")
---
O         self.text("0")
49c49
N         self.text.set('0')
---
O         self.text('0')
53,55c53,55
N         self.eval.shiftOpnd(self.text.get())    # last or only opnd
N         self.eval.closeall()                    # apply all optrs left
N         self.text.set(self.eval.popOpnd())      # need to pop: optr next?
---
O         self.eval.shiftOpnd(self.text())     # last or only opnd
O         self.eval.closeall()                 # apply all optrs left
O         self.text(self.eval.popOpnd())       # need to pop: optr next?
61c61
N             self.text.set('(')                    # clear text next
---
O             self.text('(')                      # clear text next
64,66c64,66
N             self.eval.shiftOpnd(self.text.get())  # last or only nested opnd
N             self.eval.close()                     # pop here too: optr next?
N             self.text.set(self.eval.popOpnd())
---
O             self.eval.shiftOpnd(self.text())    # last or only nested opnd
O             self.eval.close()                   # pop here too: optr next?
O             self.text(self.eval.popOpnd())
70c70
N                 self.text.set(char)                    # clears last value
---
O                 self.text(char)                 # clears last value
72c72
N                 self.text.set(self.text.get() + char)  # else append to opnd
---
O                 self.text(self.text() + char)   # else append to opnd
76c76
N         self.eval.shiftOpnd(self.text.get())  # push opnd on left
---
O         self.eval.shiftOpnd(self.text())      # push opnd on left
78c78
N         self.text.set(self.eval.topOpnd())    # push optr, show opnd|result
---
O         self.text(self.eval.topOpnd())        # push optr, show opnd|result
95c95
N                 self.text.set(value)          # expression or statement
---
O                 self.text(value)              # expression or statement




Changes for "guimixin.py", example 11-17, page 331, errata #47


61c61
N         text = ScrolledText(new, height=30, width=90); text.pack()
---
O         text = ScrolledText(new, {'height':30, 'width':90, Pack:{}})  #1.2




Changes for appendix E, page 834, 3rd line from bottom, errata #2


Note: the line numbers don't mean much here--it's an unlabeled code snippet.

17c17
N schedule = [ (firstFunction, ('Hello world!',)), (count, ([1,2,3], [2,4])) ]
---
O schedule = [ (firstFunction, ('Hello world!')), (count, ([1,2,3], [2,4])) ]

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