batch.spec

python = <<EOF

from batchutil import bazzinga

def foo(batch):
    return f"foo: I am {batch.name}"

def bar(batch):
    return f"bar: I am {batch.name}"
    
def baz(batch):
    return bazzinga(batch)
    
EOF

<batch>
  name p&l_calulator
  exec_str echo %foo(self)%
</batch>

batchutil.py

def bazzinga(batch):
    return f"baz: I am {batch.name}"

test.py

from apacheconfig import *

with make_loader() as loader:
    config = loader.load('cleanbatch.spec')
   
class BatchJobSpec:
    
    def __init__(self, pythoncode , batch):
        self.pythoncode = pythoncode
        self.name = batch.get("name")
        self._exec_str = batch.get("exec_str")
        self.exec()
        
    def exec(self):
        locals_ = {'self': self}
        exec(self.pythoncode, locals_)
            
        _exec = []
    
        for attrib in locals_.keys():
            if not attrib in ['__builtins__', 'self']:
                setattr(BatchJobSpec, attrib, staticmethod(locals_[attrib]))
                
    @property
    def exec_str(self):
        _exec = self._exec_str.split("%")
        
        for i in range(len(_exec)):
            if _exec[i].endswith('(self)'):
                f = self.__getattribute__(_exec[i][:-6])
                _exec[i] = f(self)
                return ''.join(_exec)
        
batchjobspec = BatchJobSpec(config.get("python"), config.get("batch"))

print(batchjobspec.name)
print(batchjobspec.exec_str)
print(batchjobspec.baz(batchjobspec))

@agrawalo

Ahh, using

setattr(BatchJobSpec, attrib, locals_[attrib])

make it a full class method, now you can use

print(batchjobspec.baz())