Python Pandas - 用特定值屏蔽和替换 NaN
要屏蔽 NaN 并用特定值替换它们,使用 index.putmask() 方法。在其中,设置 index.isna() 方法。
首先,导入所需的库 -
import pandas as pd import numpy as np
使用一些 NaN 创建 Pandas 索引 −
index = pd.Index([5, 65, 10, np.nan, 75, np.nan])
显示 Pandas 索引 −
print("Pandas Index...\n",index)
屏蔽 NaN 索引值并用特定值替换它们 −
print("\nMask...\n",index.putmask(index.isna(), 111))
示例
以下为代码 −
import pandas as pd import numpy as np # Creating Pandas index with some NaNs index = pd.Index([5, 65, 10, np.nan, 75, np.nan]) # Display the Pandas index print("Pandas Index...\n",index) # Return the number of elements in the Index print("\nNumber of elements in the index...\n",index.size) # mask and replace NaN index values with a specific value print("\nMask...\n",index.putmask(index.isna(), 111))
输出
这将生成以下输出 −
Pandas Index... Float64Index([5.0, 65.0, 10.0, nan, 75.0, nan], dtype='float64') Number of elements in the index... 6 Mask... Float64Index([5.0, 65.0, 10.0, 111.0, 75.0, 111.0], dtype='float64')
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