Code Restrictions

The following code restrictions are necessary to ensure that the functions inside gettsim can be vectorized automatically. The code restrictions are checked and throw an error if violated.

If-Else Conditions

1. Code inside an if / elif / else block can only perform one operation. For example, the following is allowed:

   if x > 1:
       out = 1
   else:
       out = 0
   

   while

   if x > 1:
       flag = True
       out = 1
   else:
       out = 0
   

   is not allowed since the code inside the if block performs two operations.

2. There cannot be a return statement inside a single if-condition. For example, the following is allowed:

   if x > 1:
       return 1
   else:
       return 0
   

   or

   if x > 1:
       out = 1
   else:
       out = 0
   return out
   

   while

   out = 0
   if x > 1:
       return 1
   return out
   

   is not allowed.

3. Only certain operations can be performed in the body of an if / elif / else condition. For example, the following operations are allowed:

   • Assigning a variable (e.g. out = 1)

   • Returning a value (e.g. return 1)

   • One-line if-else conditions (e.g. out = 1 if x > 1 else 0)

   • Nested if-elif-else conditions

Function Calls

This is a list of restrictions applying to functions from the base and math modules.

1. The following functions can only be called with iterable arguments:

   • sum

   • any

   • all

   For example the following is allowed:

   any([True, False, False])
   

   while

   any(True, False, False)
   

   is not allowed.
   
   

2. The following functions can only be called with two arguments or one iterable argument. For example the following is allowed:

   min([1, 2, 3])
   

   and

   min(left, right)
   

   while

   min(1, 2, 3)
   

   or

   min(left, middle, right)
   

   is not allowed.