如何将数据框单元格值作为传递给函数的变量名返回

Question

I made a function that returns a few statistics, but I would like the last column to be the name of the parameter that is inserted into the function.

The code below shows the function and I would like the last column "Region" to give the value of the parameter that I used to initiate the function "NameofRegion"

def roiStats(roi):
    data = {'Mean': np.mean(roi),
            'Median': np.median(roi),
            'StdDev': np.std(roi),
            'Min': np.min(roi),
            'Max': np.max(roi),
            'Region': NameofRegion}
    df = pd.DataFrame(data, index=[0])
    return df

roiStats(NameofRegion)

I would think the answer is:

... "Region": roi

But that returns an error: "Must be 1 dimensional". So the biggest issue is that 'NameofRegion' is a cropped area of an image; A 2d array of pixel values.

Answer 1

Suppose you have regions a, b, c, d. Instead of doing something like:

roia = #something a
roib = #something b
roic = #something c
roid = #something d

Consider doing:

roi_dict = {
'a': #something a, 
'b': #something b,
'c': #something c,
'd': #something d
}

Then you can do like this:

def roiStats("NameOfRegion", roi_dict):
    roi = roi_dict["NameOfRegion"]
    data = {'Mean': np.mean(roi),
            'Median': np.median(roi),
            'StdDev': np.std(roi),
            'Min': np.min(roi),
            'Max': np.max(roi),
            'Region': "NameofRegion"}
    df = pd.DataFrame(data, index=[0])
    return df

roiStats("NameofRegion", roi_dict)

Note that now NameofRegion will be a string and thus you can print it