callable function returns True if the object can be called : callable « Buildin Function « Python Tutorial

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Python Tutorial » Buildin Function » callable 
13. 5. 2. callable function returns True if the object can be called
import string 

print string.punctuation                        
print string.join                                    
print callable(string.punctuation)                  
print callable(string.join)                           
print string.join.__doc__
13. 5. callable
13. 5. 1. callable() tells if an object can be invoked via the function operator ().
13. 5. 2. callable function returns True if the object can be called
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