Python printing a procedure -

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I'm trying to print a process in Python How do I print it? Here is my code 

  def proc (a, b): if test (a): return b a print proc (a, b)   
 but I get this error:  
 
 Error named: Name 'A' is not defined   
 Thanks in advance   < P> 
 
  a  is the name of the local variable that is used for the value when the first argument goes to the function It is called when actually  calling , you need real value For example:  
  def proc (a, b): if test (a): return B return ax = 6 print proc (x, 7)   
 Now when called  proc , then the variable  x  and value < The value of code> 7  is passed to  proc . In the calling area, there will be a similar value to  proc ,  a  within  x  (at the time of call), and similarly  b  Will have the value  7 .

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