str_test = 'test'
str_test += ('', '_y')[-1] # 'test_y' ok
# 'a' += 'b' # SyntaxError 只有变量可以赋值
str_test = 'test'
str_test += ('', '_y')[-1] # 'test_y' ok
# 'a' += 'b' # SyntaxError 只有变量可以赋值
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