Binärbaumsuche ergänzt

tk_binsearch/tk_binsearch.py

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+import tkinter as tk
+import tkinter.ttk as ttk
+
+TESTLIST = ["Apfel", "Birne", "Cassis", "Dattel", "Erdbeere",
+            "Felsenbirne", "Granatapfel", "Heidelbeere", "Immergrün",
+            "Johannisbeere", "Kamille", "Lauch", "Meerrettich",
+            "Nahrung", "Obst", "Pastinake", "Quellwasser", "Rettich",
+            "Salat", "Tomate", "Unkraut", "Vogelbeere", "Walderdbeere",
+            "Xylit", "Ysop", "Zwetschge"]
+
+def binsearch(list_for_search, keyword, depth:int=0):
+    l = len(list_for_search)
+    print("BS Tiefe {}, Restlänge {}: {}".format(depth,l,list_for_search))
+
+    if l == 1 and list_for_search[0] == keyword:
+        return {"result": 1, "word": list_for_search[0]}
+    elif l > 1:
+        w = list_for_search[l // 2]
+        if keyword < w :
+            newlist = list_for_search[: l // 2]
+            return binsearch(newlist, keyword, depth+1)
+        else:
+            newlist = list_for_search[l // 2:]
+            return binsearch(newlist, keyword, depth+1)
+    else:
+        return {"result": 0, "word": "not found"}
+
+class Controller(object):
+    def __init__(self, app):
+        self.app = app
+        self.list_for_search = TESTLIST
+        self.keyword = "Nothing"
+
+    def fill_list(self):
+        self.app.fill_input_list(self.list_for_search)
+
+    def fill_entry(self, text: str = None):
+        if text is None:
+            text = "Apfel"
+        self.keyword = text
+        self.app.fill_entry(text)
+
+    def run_search(self):
+        print("Run")
+        self.keyword = self.app.get_keyword_entry()
+        result = binsearch(self.list_for_search, self.keyword)
+        if result["result"] == 1:
+            # success
+            print("word found")
+            print("The word is: {}".format(result["word"]))
+            self.app.set_canvas_color("green")
+            return 1
+        else:
+            # failure
+            print("word not found.")
+            self.app.set_canvas_color("red")
+            return -1
+        return 0
+
+
+class Application(tk.Tk):
+    def __init__(self):
+        super().__init__()
+        self.con = Controller(self)
+        self.create_control_variables()
+        self.create_widgets()
+        self.con.fill_list()
+        self.con.fill_entry()
+
+    def create_control_variables(self):
+        self.e_search_var = tk.StringVar()
+
+    def fill_input_list(self, list_for_display: list = None):
+        if list_for_display is None:
+            list_for_display = [1,2,3,4,5]
+        else:
+            pass
+        for e in list_for_display:
+            self.lb_input.insert(tk.END, e)
+
+    def fill_entry(self, text):
+        self.e_search_var.set(text)
+
+    def get_keyword_entry(self):
+        return self.e_search_var.get()
+
+    def set_canvas_color(self, color:str=None):
+        if color is None:
+            color = "black"
+        self.c.configure(background=color)
+
+    def create_widgets(self):
+        self.lf_input = ttk.Labelframe(master=self, labelanchor="n", text="Eingabe")
+        self.lf_input.grid(row=0, column=0, columnspan=2)
+
+        self.lb_input = tk.Listbox(master=self.lf_input)
+        self.lb_input.grid(row=0, column=0)
+
+        self.lf_search = ttk.Labelframe(master=self, labelanchor="n", text="Suche")
+        self.lf_search.grid(row=1, column=0)
+
+        self.e_search = ttk.Entry(master=self.lf_search, textvariable=self.e_search_var)
+        self.e_search.grid(row=0, column=0)
+
+        self.b = ttk.Button(master=self, text="Suchen", command=self.con.run_search)
+        self.b.grid(row=1, column=1)
+
+        self.c = tk.Canvas(master=self, background="black",width=150, height=30)
+        self.c.grid(row=2, column=0, columnspan=2)
+
+
+# --------------------------
+# Execution
+# --------------------------
+if __name__ == "__main__":
+    app = Application()
+    app.mainloop()