Running Python program from command line

Question

I am using Windows Powershell to import Python file and create instance of one of the class defined with in file as follows:

import random
class RandomWalker:
    def __init__(self):
        self.position = 0

    def walk(self, n):
        self.position = 0
        for i in range(n):
            yield self.position
            self.position += 2*random.randint(0,1) -1

This file is randomWalk.py

So, I run the below command on Python command line:

>>> import randomWalk

But when I try to create an instance of the class it throws an error:

>>> walker = RandomWalker()

Traceback (most recent call last):
  File "", line 1, in 
NameError: name 'RandomWalker' is not defined

What am I missing? I tried to google, I assume we can create an instance of class on Python command line interface.

Also found this post which ans the question: stackoverflow.com/questions/30562669/… — 0726
– 0726, Commented Sep 14, 2019 at 12:12
I assume same need not be done in python notebooks. I was following below link for reference which directly access the class : cs.bgu.ac.il/~ppl172/wiki.files/practice/VectorizingLoops.html — 0726
– 0726, Commented Sep 14, 2019 at 12:19

wallisers · Accepted Answer · 2019-09-14 12:00:09Z

4

You are importing only the module, not the class. With the code you provided try:

import randomWalk

walker = randomWalk.RandomWalker()

or for importing the class directly:

from randomWalk import RandomWalker

walker = RandomWalker()

answered Sep 14, 2019 at 12:00

wallisers

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Comments

Ansgar Wiechers · Accepted Answer · 2019-09-14 12:14:59Z

3

You should try:

walker = randomWalk.RandomWalker()

edited Sep 14, 2019 at 12:14

Ansgar Wiechers

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answered Sep 14, 2019 at 11:54

Patrick Lehnen

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