CODEWITHSUNDEEP
python
neilhu
neilhu

Reputation: 35

Python classes and modules

I am teaching myself Python and hit a roadblock with classes and modules. The code below is something that you would probably never write, but I would like to just understand my error.

import random

class GetRandom:
    def __init__(self):
        self.data = ""

    def ranNumber():
        return random.random()

b = GetRandom()
bnum = b.ranNumber
print bnum

The output I am getting is:

<bound method GetRandom.ranNumber of <__main__.GetRandom instance at 0x7fe87818df38>>

I had expected a random number between 0 and 1. What am I doing wrong?

Thanks

Upvotes: 1

Views: 73

Answers (1)

user2555451
user2555451

Reputation:

There are two problems here:

  1. You forgot to actually invoke GetRandom.ranNumber. Add () after it to do this:

    bnum = b.ranNumber()

  2. You need to make GetRandom.ranNumber accept the self argument that is passed implicitly when you invoke the method:

    def ranNumber(self):
    return random.random()

Once you address these issues, the code works as expected:

>>> import random
>>> class GetRandom:
...     def __init__(self):
...         self.data = ""
...     def ranNumber(self):
...         return random.random()
...
>>> b = GetRandom()
>>> bnum = b.ranNumber()
>>> print bnum
0.819458844177
>>>

Upvotes: 2

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