Python definitions

1. Python variables are defined as

   x = 42
   s = 'abc'
   pi = 3.14
   

2. Python functions are defined as

   def convert(f):
     return 5/9 * (f-32)
   

   • There must be an explicit return to return the result.
   • Note also how the body of the function is indented.

3. return returns and print prints.

   def add3return(n):
       return n + 3
   
   def add3print(n):
       print(n + 3)
   
   7 + add3return(5)
   
   7 + add3print(5)  # fails!