是Python 中的一个异常,它通常表示数值计算超出了可表示的范围。在整数(int)操作中,这可能是因为尝试创建一个太大的数,而在浮点数(float)转换为整数时,如果浮点数表示了无限大(infinity)或无限小(negative infinity),也会导致此异常,因为无穷大的概念无法映射到有限的整数范围内。
Python的float类型还支持表示无限大和不是一个数字(NaN)的特殊值。这些值在处理极限情况或错误结果时非常有用。 python复制代码 # 无限大infinity=float('inf') negative_infinity =float('-inf') print(infinity>1e300) # 输出:Trueprint(negative_infinity <-1e300) # 输出:True#NaN(不是一个数字)nan=float...
and optionally embedded in whitespace. The optional sign may be'+'or'-'; a'+'sign has no effect on the value produced. The argument may also be a string representing a NaN (not-a-number), or a positive or negativeinfinity. More precisely, the input must conform to the ...
[23's 0 or 1]] # positive infinity >>> float_convert(math.inf) [[0], [1, 1, 1, 1, 1, 1, 1, 1], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]] # negative infinity >>> float_convert(-math.inf) [[1], [1, 1,...
Decimal numbers include special values such as NaN which stands for “Not a number”, positive and negative Infinity, and -0 取余运算、指数幂运算、取绝对值、四舍五入 1 print(3%2) # 通常就做整数间的取余运算 2 print(type(3%2))
Ifx = m / nis a negative rational number definehash(x)as-hash(-x). If the resulting hash is-1, replace it with-2. The particular valuessys.hash_info.inf,-sys.hash_info.infandsys.hash_info.nanare used as hash values for positive infinity, negative infinity, or nans (respectively)....
negative_infinity = float("-inf")not_a_number = float("nan")这些特殊的浮点数值在处理某些算法或数学运算时非常有用，比如当遇到除数为零的情况时。5. 格式化输出: 当需要以特定格式输出浮点数时，可以使用字符串格式化方法。示例:python price = 123.456789 formatted = format(price, '.2f')...
Decimal numbers include special values such as NaN which stands for “Not a number”, positive and negative Infinity, and -0 取余运算、指数幂运算、取绝对值、四舍五入 1print(3%2)#通常就做整数间的取余运算2print(type(3%2))3print(type(3.0%2))#不建议浮点型取余4print(2.1%2)#虽然float也...
I have been frequently using positive and negative infinity as default values for values that should otherwise be ints. Because of Python's duck typing this is a convenient pattern that sometimes allows reducing some special-casing logic.
如果参数 x 是普通的Python对象,float([x]) 返回的是调用 x.__float __() 结果。 兼容性 Python2.x Python3.x 注意点 1. 这个函数有一个特别的地方,就是使用infinity或inf来表示无穷大的数。比如+inf是正无穷大,-inf是负无穷大。在这里引入了数学上的无穷大概念,那么无穷大乘以0是等于什么呢?在这里是...