CODEWITHSUNDEEP
pythonnameerror
Charles Tang
Charles Tang

Reputation: 187

NameError: global name Error in Class , but is actually defined

I have the following code, where somehow the class is not honoring the self. name., when I access the class variable in a function, it is complaining that the self.variable is not a global variable. Any ideas why? 

from sqlalchemy import Column, ForeignKey, Integer , String, Float, DateTime
from sqlalchemy.ext.declarative import declarative_base

Base=declarative_base() 

class Designs(Base):
  __tablename__='designs'
  design_name=Column(String(80),nullable=False,primary_key=True)

  @property
  def serialize(self):
      return{
        'design_name': self.design_name,
       }

When I access the class, design_name is there, but somehow python is complaining it is not declared as global? Any Ideas?

let's say temp declared with the Designs class, and is filled with value for design_name

  print temp.design_name
  print temp.serialize()

xpc_fp   <----- print i.design_name works

serialize command does not work** and gives the following error:

  Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
  File "database_setup.py", line 149, in serialize
    'design_name': self.design_name,
NameError: global name 'design_name' is not defined

Upvotes: 1

Views: 491

Answers (1)

Cicero
Cicero

Reputation: 2962

You define serialize as a property - so you should treat it as a property.

from sqlalchemy import Column, ForeignKey, Integer , String, Float, DateTime
from sqlalchemy.ext.declarative import declarative_base

Base=declarative_base()

class Designs(Base):
  __tablename__='designs'
  design_name=Column(String(80),nullable=False,primary_key=True)

  @property
  def serialize(self):
    return{
      'design_name': self.design_name,
    }



temp = Designs(design_name='HELLO THERE')
print(temp.design_name)
print(temp.serialize)

so drop the parenthesis from the .serialize call

output:
HELLO THERE
{'design_name': 'HELLO THERE'}

Upvotes: 1

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