import functools
 
funcs = {"Add":      lambda a, b: a + b,
         "Subtract": lambda a, b: a - b,
         "Multiply": lambda a, b: a * b,
         "Divide":   lambda a, b: a / b}
 
def do_operation(name, func, a, b):
    print(name, ":", func(a, b))
 
# As you can see, putting functions into a list like this does not work; it just calls the last function repeatedly.
# This is because all of the lambdas are pointing to the same location for "name" and "func", which are overwritten
# on each iteration until they have the values of the last item iterated.
exec_list = []
for name, func in funcs.items():
    exec_list.append(lambda: do_operation(name, func, 3, 5))
 
for e in exec_list:
    e()
 
 
print()
# You can avoid this by using the 'functools' library, which also offers a more comprehensible syntax, akin to a C++
# 'std::bind' one.
exec_list = []
for name, func in funcs.items():
    exec_list.append(functools.partial(do_operation, name, func, 3, 5))
 
for e in exec_list:
    e()

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