String formatting in Python [duplicate]

Question

In a django app I am writing,I have created a MyEntry and MyCategory ,and given unicode() implementations for them.To represent an entry ,I am using a string built from an entry's category name,starttime and entry's creation date.

However ,when I try to list the entries,I am getting

['category1']13:02:542011-07-16

['category2','category3']18:21:342011-07-11

['category3']18:09:192011-07-11

This [] comes from the list comprehension I guess. I wish I could get the names like

 category2,category3-18:21:34-2011-07-11
 category3-18:09:19-2011-07-11

How should I implement unicode() for my models to get this effect? Can someone help?

My models are

from datetime import date
class MyCategory(models.Model):
    name=models.CharField(unique=True,max_length=50)
    ...
    def __unicode__(self):
        return self.name

class MyEntry(models.Model):
    today=models.DateField(default=date.today)   
    starttime=models.TimeField(null=True)     
    categories=models.ManyToManyField(MyCategory)
    ...
    def __unicode__(self):        
        return "%s%s%s"%([str(x.name) for x in self.categories.all()],self.starttime,self.today)

Eric O. Lebigot · Accepted Answer · 2011-07-16 08:48:12Z

1

You want to replace "%s%s%s"%([str(x.name) for x in self.categories.all()],…) with "%s-%s%s" % (','.join(str(x.name) for x in self.categories.all()),…).

answered Jul 16, 2011 at 8:48

Eric O. Lebigot

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