如何在Python语言中将数字转换为NaN值？

import numpy as np

num = 1.0  # 要转换的数字
nan_value = np.nan  # NaN值

result = np.isnan(num)  # 判断num是否为NaN
print(result)  # 输出：False

# 将数字转换为NaN
nan_num = np.nan_to_num(num, nan=nan_value)
print(nan_num)  # 输出：nan

result = np.isnan(nan_num)
print(result)  # 输出：True

import pandas as pd

num = 1.0  # 要转换的数字
nan_value = pd.NA  # NaN值

result = pd.isna(num)  # 判断num是否为NaN
print(result)  # 输出：False

# 将数字转换为NaN
nan_num = pd.NA if pd.isna(num) else num
print(nan_num)  # 输出：nan

result = pd.isna(nan_num)
print(result)  # 输出：True

import math

num = 1.0  # 要转换的数字

result = math.isnan(num)  # 判断num是否为NaN
print(result)  # 输出：False

# 将数字转换为NaN
nan_num = float('nan')
print(nan_num)  # 输出：nan

result = math.isnan(nan_num)
print(result)  # 输出：True