import file but reports error NameError: name 'something' is not defined

Question

testa.py

class A:

    s1 = 333
    __age = 0

    def __init__(self,age ):
        self.__age=age
        return

    def __del__(self):  

        return  
    #private
    def __doSomething(self, s): 
        print self.__age 
        return            
    #public
    def doSomething(self, s):  
        self.__doSomething(s)    
        print s

test.py

import sys
import testa

a=A(111)
a.doSomething('222')

run

python test.py

it reports error:

NameError: name 'A' is not defined

your comment welcome

use 'testa.A' or import it like that: 'from testa import A' – dnlcrl May 10 '15 at 08:13 — dnlcrl, May 10 '15 at 08:13

score 3 · Accepted Answer · answered May 10 '15 at 08:13

3

Use
a=testa.A(111)

You must name the package unless you import A explicitly e.g

from testa import A

answered May 10 '15 at 08:13

Paul Rooney

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Discounting that you'd ever dream of using `from testa import *` – Paul Rooney May 10 '15 at 08:18
@Paul Rooney 'from testa import *' is better or not? – arachide May 10 '15 at 08:32
No it's generally considered [bad practice](http://stackoverflow.com/questions/2360724/in-python-what-exactly-does-import-import). – Paul Rooney May 10 '15 at 08:37

score 0 · Answer 2 · answered May 10 '15 at 08:38

Remember this:

Doing: import mymodule does not import the whole methods and attributes of mymodule to the namespace, so you will need to refer to mymodule, everytime you need a method or attribute from it, using the . notation, example:

x = mymodule.mymethod()

However, if you use:

from mymodule import *

This will bring every method and attribute of mymodule into the namespace and they are available directly, so you don't need to refer to mymodule each time you need to call one of its method or attribute, example:

from mymodule import *

x = mymethod()  #mymethod being a method from mymodule

You can also import specific method if you don't want to bring the whole module:

from mymodule import myMethod

For further details, read the Python docs:

https://docs.python.org/2/tutorial/modules.html

import file but reports error NameError: name 'something' is not defined

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