python - How to set NULL for IntegerField instead of setting 0? -


i'm uploading data excel file using xlrd , turning data models (with integerfield values) in django. excel file has bunch of missing data. unfortunately, these missing data converted value of 0 in models, instead of null. means when person model doesn't have age, age gets recorded 0, instead of null.

what's best way change this? i've tried doing this:

age = models.integerfield(blank=true, null=true)

but blank fields still set 0 default.

instead of using 

age = models.integerfield(blank=true, null=true)

use 

age = models.integerfield()

when donot specify

blank=true, null=true

it store null in column


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