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import pandas as pd


    

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def knn0(datacsv,testcsv):
    global data,test,i,d,ac
    data=pd.read_csv(datacsv)
    test=pd.read_csv(testcsv)
    test['pre']='0'
    i = pd.DataFrame()
    d = pd.DataFrame()
 
    return


    

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def knn1():
    for a in range(len(test.index)):
        global d
        data[a] = ((data.rWC-test.rWC[a])**2+(data.rCh-test.rCh[a])**2)**0.5
        #print(data)
        d = data
    return d


    

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def knn2(k):
    global test,d,ac,acc
    for a in range(len(test.index)):
        i = data.sort_values([a], ascending=True).head(n=k)
        test.loc[a,'pre'] = pd.value_counts(i['Type']).idxmax()
        if test.loc[a,'pre'] == test.loc[a,'Type']:
            ac +=1
            acc = ac/len(test.index)
    return


    

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def knn(datacsv,testcsv,k):
    global test,ac
    knn0(datacsv,testcsv)
    knn1()
    dic={}
    for ii in range(1,k+1): 
        ac = 0
        knn2(ii)
        #print(test,ac)
        key={ii:acc}
        dic.update(key)
    return test,dic


    

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knn('atomsradii.csv','testing.csv',7)


    

    
Out[6]:





(    rWC   rCh Atom Type  pre
 0  0.51  1.12   X1  Alk  Alk
 1  0.37  0.77   X2   TM  Alk
 2  0.62  0.35   X3   PT   PT
 3  0.62  0.62   X4   TM   PT
 4  0.62  0.93   X5  Alk  Alk,
 {1: 0.8, 2: 0.8, 3: 0.6, 4: 1.0, 5: 0.6, 6: 0.6, 7: 0.6})

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