[Python] How to get parameter names inside python function

I've been working on it for a few days, but I can't tell. I need advice from Python masters. Thanks

def myPrint(cmd=None):
for name, value in globals().items():
if value is cmd:
print(f'{cmd} = {value}')

a = 'alpha'
b = 'alpha'
myPrint(b)

result>
alpha = alpha
alpha = alpha

but I want to result...
myPrint(a) ----> a = 'alpha'
myPrint(b) ----> b = 'alpha'
myPrint(a+b) ----> a+b = 'alphaalpha'

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