in a .py file I have the following:
class avgbox:
def __init__(self,t,n,a):
self.t = t
self.n = n
self.a = a
def add(x):
self.t += x
self.n += 1
self.a = t/n
Now when I do the from file.py import * in the interactive python shell run from the ubuntu command line, it shows no error. Then when do a = avgbox(0,0,0) it says NameError: name 'avgbox' is not defined. Any ideas? What am I doing wrong here? Thanks!
I copy pasted your code into a file named "file.py". Then I did the following:
from file import *
avgbox(1, 2, 3)
It worked. Maybe your mistake was that you were doing from file.py import * when you should just be doing from file import * Remember that when Python searches for module names, it automatically appends .py to the name of the module if it's looking for a Python file within the current directory. Of course, you can also search within packages using the from syntax, but that's a different story.
You must make sure that the file is in the same directory as your python interpreter is. You must also remove the .py in the from file.py import * as the .py signifies a different module in a package, for example import os.path. If the file is not in the same directory as the python shell, you must make sure that python is able to find it in your PATH variable.
It is also notable that you should not usually do a from file import * as this will pollute the namespace that you import it into, as it imports it as function_names instead of module.function_names. You can do from file import function1,function2,... and this will only import those functions into the current namespace, and no others.
Also, make sure that in a class you put self as the first parameter for each function in the class, as it will raise a syntax error if you don't.
from foo import *is nearly always a bad idea.from file import avgboxselfas the first argument in theaddmethod!from file.py import *should be throwing an error. Tryfrom file import *.avgbox. Tryfrom file import avgbox, and if this doesn't work, restart your interactive interpreter.