经过测试，python会缓存的小整数的范围是 [-5, 256]
# True a = 1 b = 1 print(a is b) # True a = "good" b = "good" print(a is b) # False a = "very good morning" b = "very good morning" print(a is b) # False a = [] b = [] print(a is b)
原文：https://www.cnblogs.com/qiang-upc/p/11163042.html