Creating class - name not defined error

[python_alex]

Hello, I am trying to learn how to create a class by following the toss coin exercise from a textbook but I kept getting the error (NameError: name Coin is not defined). I copied exactly as shown in the texbook and I am using the latest IDLE 3.65. Wonder if anyone could advise me what I did wrong or is it a version compatibility problem. Thanks.

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import random   class Coin:        def __init__(self):           self.sideup = 'Heads'        def toss(self):           if random.ranint(0,1) ==0:                self.sideup = 'Heads'           else:                self.sideup  = 'Tails'        def get_sideup(self):           return self.sideup        def main():           mycoin = Coin()             print ('This side is up: ', my_coin.get_sideup())           print ('I am tossing the coin...')           my_coin.toss()           print ('This side is up: ', my_coin.get_sideup())                  main()

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Noted, thanks.

[gontajones]

Pay attention at indentation of you main() function, it must be outside of the Coin class.

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import random     class Coin:       def __init__(self):         self.sideup = 'Heads'       def toss(self):         # Changed to randrange(interval)         if random.randrange(2) == 0:             self.sideup = 'Heads'         else:             self.sideup = 'Tails'       def get_sideup(self):         return self.sideup     def main():     # Changed to my_coin, like you call after     my_coin = Coin()       print('This side is up: ', my_coin.get_sideup())     print('I am tossing the coin...')     my_coin.toss()     print('This side is up: ', my_coin.get_sideup())     main()

[python_alex]

thank you so much. Was never aware that indent has an effect.

[snippsat]

I am using the latest IDLE 3.65

Can show some small changes,get method removed as is not needed in Python,and trow in f-string as you use 3.6.
I don't like the function name main() i know it's used everywhere in Python,just give a name that fit code better.

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import random   class Coin:     def __init__(self):         self.sideup = 'Heads'       def toss(self):         if random.randrange(2) == 0:             self.sideup = 'Heads'         else:             self.sideup = 'Tails'   def toss_result():     my_coin = Coin()     print(f'This side is up: {my_coin.sideup}')     print('I am tossing the coin...')     my_coin.toss()     print(f'This side is up: {my_coin.sideup}')   if __name__ == '__main__':     toss_result()