# 导入数学库import math# 检查某些值是否为无穷大print(math.isinf(56))print(math.isinf(-45.34))print(math.isinf(+45.34))print(math.isinf(math.inf))print(math.isinf(float("nan")))print(math.isinf(float("inf")))print(math.isinf(float("-inf")))print(math.isinf(-math.inf))