获取 Python 中浮点类型机器限制信息
要获取浮点类型机器限制信息,请在 Python Numpy 中使用 numpy.finfo() 方法。第一个参数是浮点类型,即获取信息所用的浮点数据类型。
步骤
首先,导入所需库 −
import numpy as np
min 是给定 dtype 的最小值,max 是给定 dtype 的最大值。
检查 float16 类型 −
a = np.finfo(np.float16)
print("Minimum of float16 type...\n",a.min)
print("Maximum of float16 type...\n",a.max)检查 float32 类型 −
b = np.finfo(np.float32)
print("\nMinimum of float32 type...\n",b.min)
print("Maximum of float32 type...\n",b.max)检查 float64 类型 −
c = np.finfo(np.float64)
print("\nMinimum of float64 type...\n",c.min)
print("Maximum of float64 type...\n",c.max)示例
import numpy as np
# To get the machine limits information for float types, use the numpy.finfo() method in Python Numpy
# The first parameter is the floating type i.e. the kind of float data type to get information about.
# Checking for float16 type
# The min is the minimum value of given dtype.
# The max is the minimum value of given dtype.
a = np.finfo(np.float16)
print("Minimum of float16 type...\n",a.min)
print("Maximum of float16 type...\n",a.max)
# Checking for float32 type
b = np.finfo(np.float32)
print("\nMinimum of float32 type...\n",b.min)
print("Maximum of float32 type...\n",b.max)
# Checking for float64 type
c = np.finfo(np.float64)
print("\nMinimum of float64 type...\n",c.min)
print("Maximum of float64 type...\n",c.max)输出
Minimum of float16 type... -65500.0 Maximum of float16 type... 65500.0 Minimum of float32 type... -3.4028235e+38 Maximum of float32 type... 3.4028235e+38 Minimum of float64 type... -1.7976931348623157e+308 Maximum of float64 type... 1.7976931348623157e+308
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