testing for empty/null string in django

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I have a charfield with the following:

myString = models.CharField(max_length=50,null=True,blank=True)

In many of my objects, this particular string is often left blank, when created through the django admin interface. In MySQL, the column is VARCHAR(50) with default=NULL.

Whatever test I try to do in my views.py to detect blank values, always seems to evaluate to false whether the entry is blank or not:

myString is None
myString==""
len(myString)==0

How can I discriminate between blank and non-blank values for this field?

Thanks

EDIT:

Actual view is the following, I want to execute a block only if this field is not blank.

if myObject.myString:
     #do something

the block always executes, and I have tried all the above examples of testing for a blank field.

EDIT 2:

Scratch that, if myObject.myString: does indeed work.

null django-models django python
4 Answers

In the case where your variable is either None or '' (blank), you can just handle both of the conditions as follows

if my_string:
  # neither None nor blank
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