diff --git a/jan_homework/cantor_homework.py b/jan_homework/cantor_homework.py
new file mode 100644
index 0000000..425862d
--- /dev/null
+++ b/jan_homework/cantor_homework.py
@@ -0,0 +1,226 @@
+from IPython.display import display
+import requests
+import json
+import ipywidgets as widgets
+
+def utworzTabliceDostepnychWalut():
+    
+    listaWalut = []
+    
+    r = requests.get('http://api.nbp.pl/api/exchangerates/tables/a/?format=json')
+    
+    json_var = r.content
+    json_obj = json.loads(json_var)
+    
+    for i in range(33):
+        listaWalut.append ( json_obj[0]["rates"][i]['code'])
+        
+    r = requests.get('http://api.nbp.pl/api/exchangerates/tables/b/?format=json')
+    
+    json_var = r.content
+    json_obj = json.loads(json_var)
+    
+    for i in range(116):
+        listaWalut.append(json_obj[0]["rates"][i]['code'])
+    
+    
+    r = requests.get('http://api.nbp.pl/api/exchangerates/tables/c/?format=json')
+    
+    json_var = r.content
+    json_obj = json.loads(json_var)
+    
+    for i in range(13):
+        powtorzenie = False
+        kod1 = json_obj[0]["rates"][i]["code"]
+        for j in range(149):
+            kod2 = listaWalut[j]
+            if(kod1 == kod2):
+                powtorzenie = True
+        if(powtorzenie == False):
+            listaWalut.append(json_obj[0]["rates"][i]['code'])
+    
+    listaWalut.sort()
+    
+    return listaWalut
+
+def sprzedajWalute(waluta, kwota):
+    r = requests.get("http://api.nbp.pl/api/exchangerates/tables/a/?format=json")
+    
+    json_var = r.content
+    json_obj = json.loads(json_var)
+    
+    znalezionoWalute = 0;
+    
+    for i in range(33):
+        if(waluta == json_obj[0]["rates"][i]["code"]):
+            znalezionoWalute = 1
+            tabela = "a"
+            break
+        
+        
+    if(znalezionoWalute == 0):
+        r = requests.get("http://api.nbp.pl/api/exchangerates/tables/b/?format=json")
+        json_var = r.content
+        json_obj = json.loads(json_var)
+        
+        for i in range(116):
+            if(waluta == json_obj[0]["rates"][i]["code"]):
+                znalezionoWalute = 1
+                tabela = "b"
+                break
+                
+    if(znalezionoWalute == 0):
+        r = requests.get("http://api.nbp.pl/api/exchangerates/tables/c/?format=json")
+        json_var = r.content
+        json_obj = json.loads(json_var)
+        
+        for i in range(13):
+            if(waluta == json_obj[0]["rates"][i]["code"]):
+                znalezionoWalute = 1
+                tabela = "c"
+                break
+                
+                
+                
+    if(znalezionoWalute == 1):
+        r = requests.get("http://api.nbp.pl/api/exchangerates/tables/c/?format=json")
+        json_var = r.content
+        json_obj = json.loads(json_var)
+        
+        for i in range(13):
+            if(waluta == json_obj[0]["rates"][i]["code"]):
+                kurs = json_obj[0]["rates"][i]["bid"]
+                cena = kwota * kurs
+                return (  round(cena, 2)  )
+        
+        r = requests.get(f"http://api.nbp.pl/api/exchangerates/rates/{tabela}/{waluta}/")
+        json_var = r.content
+        json_obj = json.loads(json_var)
+        kurs = json_obj["rates"][0]["mid"]
+        cena = kwota * kurs
+        return (  round(cena, 2)  )
+    
+    else:
+        return ("Brak podanej waluty")
+    
+
+def kupWalute(waluta, kwota):
+    
+    r = requests.get("http://api.nbp.pl/api/exchangerates/tables/a/?format=json")
+    
+    json_var = r.content
+    json_obj = json.loads(json_var)
+    
+    znalezionoWalute = 0;
+    
+    for i in range(33):
+        if(waluta == json_obj[0]["rates"][i]["code"]):
+            znalezionoWalute = 1
+            tabela = "a"
+            break
+        
+        
+    if(znalezionoWalute == 0):
+        r = requests.get("http://api.nbp.pl/api/exchangerates/tables/b/?format=json")
+        json_var = r.content
+        json_obj = json.loads(json_var)
+        
+        for i in range(116):
+            if(waluta == json_obj[0]["rates"][i]["code"]):
+                znalezionoWalute = 1
+                tabela = "b"
+                break
+                
+    if(znalezionoWalute == 0):
+        r = requests.get("http://api.nbp.pl/api/exchangerates/tables/c/?format=json")
+        json_var = r.content
+        json_obj = json.loads(json_var)
+        
+        for i in range(13):
+            if(waluta == json_obj[0]["rates"][i]["code"]):
+                znalezionoWalute = 1
+                tabela = "c"
+                break
+                
+    if(znalezionoWalute == 1):
+        r = requests.get("http://api.nbp.pl/api/exchangerates/tables/c/?format=json")
+        json_var = r.content
+        json_obj = json.loads(json_var)
+        
+        for i in range(13):
+            if(waluta == json_obj[0]["rates"][i]["code"]):
+                kurs = json_obj[0]["rates"][i]["ask"]
+                cena = kwota * kurs
+                return (  round(cena, 2)  )
+        
+        r = requests.get(f"http://api.nbp.pl/api/exchangerates/rates/{tabela}/{waluta}/")
+        json_var = r.content
+        json_obj = json.loads(json_var)
+        kurs = json_obj["rates"][0]["mid"]
+        cena = kwota * kurs
+        return (  round(cena, 2)  )
+    
+    else:
+        return ("Brak podanej waluty")
+    
+        
+output = widgets.Output()
+       
+zakupy = widgets.RadioButtons(
+    options=['Zakup waluty', 'Sprzedaż waluty'],
+#    value='pineapple', # Defaults to 'pineapple'
+#    layout={'width': 'max-content'}, # If the items' names are long
+    description='Zakup czy sprzedaż:',
+    disabled=False
+)
+
+waluty = widgets.Dropdown(
+    options= utworzTabliceDostepnychWalut(),
+    description= "Wybierz",
+    disabled=False,
+)
+
+kwota = widgets.FloatText(
+    value=7.5,
+    description='Kwota:',
+    disabled=False
+)
+
+
+oblicz = widgets.Button(
+    description='Oblicz',
+    disabled=False,
+    button_style='', # 'success', 'info', 'warning', 'danger' or ''
+    tooltip='Click me',
+    icon='check' # (FontAwesome names without the `fa-` prefix)
+)
+
+
+def wykonaj_na_klik(b):
+    waluta = waluty.value
+    cena = kwota.value
+    wybranie = zakupy.value
+    
+    cena = round(cena, 2)
+    
+    if(wybranie == 'Zakup waluty'):
+        with output:
+            print (kupWalute(waluta, cena))
+    else:
+        with output:
+            print (sprzedajWalute(waluta, cena))
+            
+
+def wyczysc(b):
+    output.clear_output()
+
+
+display(zakupy, waluty, kwota, oblicz, output)
+
+oblicz.on_click(wyczysc)
+
+oblicz.on_click(wykonaj_na_klik)
+
+
+    
+