class nCluster():
    def __init__(self):
        label = Label(LabelHasil, text="Jumlah cluster yang ditemukan : ")
        label.pack(side=LEFT, padx=5, pady=5)
    def n_cluster(self):
        cluster_label = Label(LabelHasil, textvariable=n_clusters_)
        cluster_label.pack(side=LEFT, padx=5, pady=5)
show_n_cluster = nCluster()

class Proses:
    def __init__(self):
        button = Button(window, text="Proses", command=lambda: stdbscan(self), width=10)
        button.pack()
    def stdbscan(self):
         ...
        global n_clusters_
        n_clusters_ = len(set(labels)) - (1 if -1 in labels else 0)
show_proses = Proses()

class Proses:
     ...
    def stdbscan(self):
     ...
    global n_clusters_
    n_clusters_ = StringVar()
    n_clusters_.set( len(set(labels)) - (1 if -1 in labels else 0) )