在 Python 中使用例項獲取浮點數的機器限制資訊


要獲取浮點型別機器限制資訊,請在 Python Numpy 中使用 numpy.finfo() 方法。第一個引數是浮點,即要獲取其資訊的浮點資料型別。

步驟

首先,匯入所需的庫 −

import numpy as np

min 是給定 dtypet 的最小值,max 是給定 dtype 的最小值。

使用例項檢查 float16 型別 −

a = np.finfo(np.float16(12.5))
print("Minimum of float16 type...\n",a.min)
print("Maximum of float16 type...\n",a.max)

使用例項檢查 float32 型別 −

b = np.finfo(np.float32(30.5))
print("\nMinimum of float32 type...\n",b.min)
print("Maximum of float32 type...\n",b.max)

使用例項檢查 float 型別 −

c = np.finfo(np.float64(55.9))
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 float i.e. the kind of float data type to get information about.

# Checking for float16 type with instances
# The min is the minimum value of given dtype.
# The max is the minimum value of given dtype.
a = np.finfo(np.float16(12.5))
print("Minimum of float16 type...\n",a.min)
print("Maximum of float16 type...\n",a.max)

# Checking for float32 type with instances
b = np.finfo(np.float32(30.5))
print("\nMinimum of float32 type...\n",b.min)
print("Maximum of float32 type...\n",b.max)

# Checking for float type with instances
c = np.finfo(np.float64(55.9))
print("\nMinimum of float64 type...\n",c.min)
print("Maximum of float64 type...\n",c.max)

輸出

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

更新於:2022-02-28

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