Solution: Logger decorator (testing)

from logger_decor import tron

@tron
def f(a, b=1, *args, **kwargs):
    print('a:     ', a)
    print('b:     ', b)
    print('args:  ', args)
    print('kwargs:', kwargs)
    return a + b

f(2, 3, 4, 5, c=6, d=7)
print()
f(2, c=5, d=6)
print()
f(10)

Calling f((2, 3, 4, 5), {'c': 6, 'd': 7})
a:      2
b:      3
args:   (4, 5)
kwargs: {'c': 6, 'd': 7}
Finished f(5)
Elapsed time: 1.3589859008789062e-05

Calling f((2,), {'c': 5, 'd': 6})
a:      2
b:      1
args:   ()
kwargs: {'c': 5, 'd': 6}
Finished f(3)
Elapsed time: 5.245208740234375e-06

Calling f((10,), {})
a:      10
b:      1
args:   ()
kwargs: {}
Finished f(11)
Elapsed time: 4.291534423828125e-06