diff --git a/calendar.py b/calendar.py
index c86849d..be505e0 100644
--- a/calendar.py
+++ b/calendar.py
@@ -8,10 +8,10 @@
 
 history={}
 class Date(datetime.datetime):
-    def __new__(s, *arg, **kwargs):
-        return datetime.datetime.__new__(s, *arg, **kwargs)
-    def __str__(s):
-        return s.strftime("%B").center(6+(7*3))
+    def __new__(cls, *arg, **kwargs):
+        return datetime.datetime.__new__(cls, *arg, **kwargs)
+    def __str__(self):
+        return self.strftime("%B").center(6+(7*3))
     @property
     def yday(s):
         j=s.strftime("%d")
@@ -21,16 +21,11 @@ def yday(s):
             k="\033[48;5;%dm%3d\033[0m"%(16+x if x<5 else 21, int(j),)
         except KeyError:
             k="%3d"%(int(j),)
-            pass
         return show_day(k)
     pass
 pass
-def count (n):
-    c=0
-    for _ in n:
-        c+=1
-        pass
-    return c
+def count(n):
+    return sum(1 for _ in n)
 def change_back(t):
     res=Date.fromtimestamp(t)
     return Date(res.year, res.month, res.day).timestamp()
@@ -38,15 +33,11 @@ def groupby(cb, itr):
     x={}
     for i in itr:
         k=cb(i)
-        if not k in x:
+        if k not in x:
             x[k]=[i]
         else:
             x[k].append(i)
-            pass
-        pass
-    for i, j in x.items():
-        yield (i, j)
-        pass
+    yield from x.items()
 
 for i in groupby(lambda x: x, map(change_back, sys.history)):
     history[int(i[0])]=len (i[1])
@@ -62,9 +53,9 @@ def sub(x):
 class Year(list):
     pass
 class Week_Vector(list):
-    def __init__(s):
+    def __init__(self):
         for _ in range(7):
-            s.append ("   ")
+            self.append("   ")
 
 def month_mem(start, end):
     def _giveday ():
@@ -74,8 +65,8 @@ def _giveday ():
         day=start
         start+=datetime.timedelta(days=1,)
         return day
+
     return _giveday
-    pass
 def calculate_each_and_every_month_s_max(y=None):
     if not y:
         y=Date.now().year
@@ -87,23 +78,20 @@ def _cal():
             i+=datetime.timedelta(days=1,)
             if i.month!=j.month:
                 yield j.month, 1, j.day
-                pass
             if j.year!=y:
                 break
+
     for month, start, end in _cal():
         s=Date(y, month, start)
         e=Date(y, month, end)
         yield (s, month_mem(s, e))
-        pass
-    pass
 
 def render_month(m):
     def _render_month(m):
         ms=[]
         sarr=Week_Vector()
         wd=0
-        yield list(map(lambda x: "%s"%(x,),
-            "Mon Tue Wed Thu Fri Sat Sun".split(" ")))
+        yield list(map(lambda x: f"{x}", "Mon Tue Wed Thu Fri Sat Sun".split(" ")))
         while True:
             for day in range(7):
                 d=m()
@@ -116,44 +104,33 @@ def _render_month(m):
                     sarr=Week_Vector()
                 wd=sta.tm_wday
                 sarr[sta.tm_wday]=d.yday
+
     for i in _render_month(m):
         if not i:
             break
         yield(" ".join(i))
-        pass
-    pass
 def pack(ya):
-    res=[]
-    for month_i, month_blob in calculate_each_and_every_month_s_max(ya):
-        month=str(month_i)
-        res.append(list([month,
-            *render_month(month_blob)]))
-        pass
-    return res
+    return [
+        [str(month_i), *render_month(month_blob)]
+        for month_i, month_blob in calculate_each_and_every_month_s_max(ya)
+    ]
 def x_x(arr, j):
     i=iter(arr)
     try:
         while True:
             yield [next(i) for _ in range(j)]
-            pass
-        pass
     except StopIteration:
         pass
-    pass
 def display_cal(y):
     print(("%d"%(y,)).center((2+6+(7*3))*3))
     for j in x_x(pack(y), 3):
         for i in zip(*j):
             print("  ".join(i))
         print("\n")
-        pass
-    pass
 
 try:
     for i in range(2018, 2022):
         display_cal(i)
-        pass
-    pass
 except OverflowError:
     pass
 sys.exit (0)