C++ Templates for Python

templates.py

def template_specialize(fname, *args):
    if fname not in globals():
        globals()[fname] = lambda *_, **__: 1/0
    
    def template_specializer(func):
        old_func = globals()[fname]
        globals()[fname] = lambda *pargs: func(*pargs) if all(isinstance(a, t) for a, t in zip(pargs, args)) else old_func(*pargs)
        return func
    
    return template_specializer

test.py

@template_specialize('div_fn', int, int)
def iidiv_fn(a,b): return a//b

@template_specialize('div_fn', int, float)
def ifdiv_fn(a,b): return a/b

print div_fn(8, 5)
print div_fn(8, 5.0)

print

@template_specialize('first', (int, float))
def incr(a):
    return a + 1

@template_specialize('first', str)
def head(a):
    return a[0]

print first(5)
print first(5.3)
print first("sds")