On 21/12/2011 19:12, Dean Richardson P.Eng 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))
-------------------------
When I run this, the shell presents thus:
>>> ================================ RESTART
================================
>>>
>>> p=Person()
>>> p.name <http://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 <http://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!
It should be:
print("Person('%s', %s)" % (self.name, self.age))
As it is, you're giving it 2 values but only %s placeholder.
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