test_list_1 = ['100', '200', '300', '200', '100']
print(test_list_1.index('200'))

2a51acb0c6f29cd8f07e810e5e3559945ce082b9
<mask token>

<mask token>
print(test_list_1.index('200'))

test_list_1 = ['100', '200', '300', '200', '100']
print(test_list_1.index('200'))
