Reconnaissance de formes en python

Bonjour, j'aimerai grâce à ce programme pouvoir reconnaître dans un nuage de points certaines figures présentes dans le programme et les relier dans le nuage de point.

Pourriez vous m'aider ? 

Merci.

#ce programme sert à reconnaitre des figures géométriques particulières dans un nuage de points


import pandas as pd
df = pd.read_csv("monFichier_test.csv")
print (df)


'''cette fonction permet de definir un carré'''
def test_carré(xA,yA,xB,yB,xC,yC,xD,yD):
    a=((xB-xA)**2+(yB-yA)**2)
    b=((xC-xB)**2+(yC-yB)**2)
    c=((xD-xC)**2+(yD-yC)**2)
    d=((xA-xD)**2+(yA-yD)**2)
    if a==b==c==d and ((xC-xB)*(xD-xC)+(yC-yB)*(yD-yC))==0 and ((xB-xA)*(xA-xD)+(yB-yA)*(yA-yD))==0:
        return True
    else:
        return False

'''cette fonction permet de definir un rectangle '''
def test_rectangle(xA,yA,xB,yB,xC,yC,xD,yD):
    a=((xB-xA)**2+(yB-yA)**2)
    b=((xC-xB)**2+(yC-yB)**2)
    c=((xD-xC)**2+(yD-yC)**2)
    d=((xA-xD)**2+(yA-yD)**2)
    if a==c and b==d and ((xC-xB)*(xD-xC)+(yC-yB)*(yD-yC))==0 and ((xB-xA)*(xA-xD)+(yB-yA)*(yA-yD))==0:
         return True
    else:
         return False


'''cette fonction permet de definir un triangle rectangle'''
def test_trianglerectangle(xA,yA,xB,yB,xC,yC):
    a=((xB-xA)**2+(yB-yA)**2)
    b=((xC-xB)**2+(yC-yB)**2)
    c=((xA-xC)**2+(yA-yC)**2)
    if b*b==a*a+c*c and ((xB-xA)*(xC-xA)+(yB-yA)*(yC-yA))==0:
        return True
    else:
         return False


from itertools import*
def polygone_find(A):
    n=len(A)
    B=list(range(0,n,2))
    trianglerectangle=[]
    carré=[]
    rectangle=[]
    RESULTAT={}
    '''je fais la recherche de triangles rectangles'''
    C=list(combinations(B,3))
    for tri in C:
        xA=A[tri[0]]
        yA=A[tri[0]+1]
        xB=A[tri[1]]
        yB=A[tri[1]+1]
        xC=A[tri[2]]
        yC=A[tri[2]+1]
        print("av",xA,yA,xB,yB,xC,yC)
        if test_trianglerectangle(xA,yA,xB,yB,xC,yC):
            test_trianglerectangle.append((tri[0],tri[1],tri[2]))
    RESULTAT.update({"trianglerectangle":trianglerectangle})

    '''je fais la recherche de carré'''
    C=list(combinations(B,3))
    for tri in C:
        xA=A[tri[0]]
        yA=A[tri[0]+1]
        xB=A[tri[1]]
        yB=A[tri[1]+1]
        xC=A[tri[2]]
        yC=A[tri[2]+1]
        xD=A[tri[3]]
        yD=A[tri[3]+1]
        print("av",xA,yA,xB,yB,xC,yC,xD,yD)
        if test_carré(xA,yA,xB,yB,xC,yC,xD,yD):
            carré.append((tri[0],tri[1],tri[2],tri[3]))
    RESULTAT.update({"carré":carré})

    '''je fais la recherche de rectangle'''
    C=list(combinations(B,3))
    for tri in C:
        xA=A[tri[0]]
        yA=A[tri[0]+1]
        xB=A[tri[1]]
        yB=A[tri[1]+1]
        xC=A[tri[2]]
        yC=A[tri[2]+1]
        xD=A[tri[3]]
        yD=A[tri[3]+1]
        print("av",xA,yA,xB,yB,xC,yC,xD,yD)
        if test_rectangle(xA,yA,xB,yB,xC,yC):
            rectangle.append((tri[0],tri[1],tri[2],tri[3]))
    RESULTAT.update({"rectangle":rectangle})

    '''la  structure retournée est le dictionnaire RESULTAT'''
    return(RESULTAT)


import matplotlib.pyplot as plt
x = [47.17788031846174
,9.155162513788252
,87.31106451765086
,90.18098777410545
,85.73425568394163
,69.21660923542944
,87.42386051005897
,35.27685634185226
,83.01845522622216
,45.32537448340496
,51.322646552859695
,69.9527028251635
,3.08569815272679
,66.30463831578771
,62.41033400206221
,80.05712601988002
,10
,10
,70
,10
,30
,90
,70
,30
,70
,89.11423668645706
,92.58342391495769
,44.22604145548783
,95.42720095700402
,21.435826737054732
,19.37910846507328
,48.943206051376606
,97.68362835412275
,72.59631895251266
,63.809973321904366
,31.42076659631765
,83.88946390215908
,62.116866264263216
,16.46862820087156]


y = [7.856866949374341
,32.60533028920386
,7.9593054773530625
,97.74037355348855
,11.752247867249043
,19.38838353746982
,23.839873731365046
,13.752179944089926
,31.00629476536042
,9.428326440424428
,59.5011025964827
,73.64015636941087
,55.46780269542562
,28.89261106782417
,41.65910883295687
,2.6141574612408958
,10
,70
,10
,10
,50
,50
,10
,10
,50
,73.20222328424518
,16.76132763110746
,1.0615177467627968
,17.271594103822896
,14.310405723515663
,57.269925634522856
,82.43371784928712
,48.3488192958625
,56.325210197081134
,12.977441456959616
,59.135914263212065
,23.574727012142937
,45.42966847449507
,63.35434423882829]

plt.scatter(x,y)

plt.title('poco y para avec Matplotlib')
plt.xlabel('x')
plt.ylabel('y')
plt.savefig('ScatterPlot_01.png')
plt.show()