On 21 December 2011 19:12, Dean Richardson P.Eng <d...@red-spanner.com>wrote:
> Hi All,
> I'm a newbie just learning Python, using a couple of books to learn the
> language. (Books: "Visual Quickstart Guide - Python, 2nd Ed", "Practical
> Programming - An Intro to Computer Science using Python"). I'm just now
> learning OOP material as presented in both books -- I'm new to this
> approach -- the last formal language I learned was Fortran77 -- :o) I am
> running Python 3.2.1 on Mac OS/X 10.6.8.
>
> My problem stems from a simple example in the Visual Quickstart book. The
> code is:
> ----------------------------
> #person.py
> class Person:
> """Class to represent a person"""
> def __init__(self):
> self.name=' '
> self.age=0
> def display(self):
> print("Person('%s', age)" %
> (self.name, self.age))
>
The "% (self.name, self.age)" means that two arguments are given in. You
only have one "%s" in the string (untested, so I may be completely off).
Additionally, use str.format now:
"Person({}, {})".format(self.name, self.age)
> -------------------------
> When I run this, the shell presents thus:
> >>> ================================ RESTART
> ================================
> >>>
> >>> p=Person()
> >>> p.name='Bob'
> >>> p.age=24
> >>> p.display()
> Traceback (most recent call last):
> File "<pyshell#33>", line 1, in <module>
> p.display()
> File "/Volumes/dean_richardson/GoFlex Home Personal/Dean's
> Code/Python3.x/Person.py", line 9, in display
> (self.name, self.age))
> TypeError: not all arguments converted during string formatting
> >>>
> ---------------
> I'm sure this is something simple, but I can't see it. Any help
> appreciated!
>
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