request of information

[leonardo selmi]

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>> gentlemen:
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>> i am reading a book about python and now i am blocked, i can't store functions in modules: i have a mac and am using version 2.7.3, i have created a function and want to save it as a file using "idle", i have saved  it with .py , when i try to import the module i get an error: traceback(most recent call last) file  
>> "<pyshell#0>", line 1, in <module> 
>> import circle
>> file "circle.py", line 1
>> syntax error: invalid syntax
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>> can you kindly help me?
>> thanks!
>> 
>> best regards
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