Python-比较值

如何从下一行为

NaN

复制值，并将标志添加为“（复制）”？ 完成-

如果值不相同，如何将

第2行

和

第3行

的值与第1行的值进行比较，并将

字符串添加为“（不相同）”，从而获得预期的输出

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将遮罩保留在变量中，以便以后使用：

df = pd.DataFrame({"col1":[np.NaN,"Cat","Cheese"],
                   "col2":["Dog","Cheese","Dog"],
                   "col3":[np.NaN,"Cat","Dog"]})

copy_mask = df.isnull()

df = df.bfill()

same_mask = df!=df.iloc[0]

df[same_mask]+=" (Not same)"
df[copy_mask]+=" (Copy)"

print (df)

                col1               col2            col3
0         Cat (Copy)                Dog      Cat (Copy)
1                Cat  Cheese (Not same)             Cat
2  Cheese (Not same)                Dog  Dog (Not same)

---

包括可以复制粘贴的数据，而不是图像。

df = pd.DataFrame({"col1":[np.NaN,"Cat","Cheese"],
                   "col2":["Dog","Cheese","Dog"],
                   "col3":[np.NaN,"Cat","Dog"]})

copy_mask = df.isnull()

df = df.bfill()

same_mask = df!=df.iloc[0]

df[same_mask]+=" (Not same)"
df[copy_mask]+=" (Copy)"

print (df)

                col1               col2            col3
0         Cat (Copy)                Dog      Cat (Copy)
1                Cat  Cheese (Not same)             Cat
2  Cheese (Not same)                Dog  Dog (Not same)