diff --git a/labs02/task02.py b/labs02/task02.py
index 98a38eb..fab948c 100644
--- a/labs02/task02.py
+++ b/labs02/task02.py
@@ -6,10 +6,7 @@
 """
 
 def days_in_year(days):
-    if ((days % 4 == 0) and (days % 100 != 0)) or (days % 400 == 0):
-        return 366
-    else:
-        return 365
+    return 366 if ((days % 4 == 0) and (days % 100 != 0)) or (days % 400 == 0) else 365
 
 def tests(f):
     inputs = [[2015], [2012], [1900], [2400], [1977]]
diff --git a/labs02/task03.py b/labs02/task03.py
index 8e63b76..e6a2a01 100644
--- a/labs02/task03.py
+++ b/labs02/task03.py
@@ -13,9 +13,7 @@ jak 'set', która przechowuje elementy bez powtórzeń.)
 
 
 def oov(text, vocab):
-    return set( text.split(' ')).difference(vocab)
-
-
+    return set(text.split(' ')).difference(vocab)
 
 
 def tests(f):
@@ -29,5 +27,6 @@ def tests(f):
             break
     return "TESTS PASSED"
 
+
 if __name__ == "__main__":
     print(tests(oov))
diff --git a/labs02/task04.py b/labs02/task04.py
index 5001cea..69dcf87 100644
--- a/labs02/task04.py
+++ b/labs02/task04.py
@@ -7,11 +7,7 @@ Jeśli podany argument jest mniejszy od 1 powinna być zwracana wartość 0.
 """
 
 def sum_from_one_to_n(n):
-    if n < 1 :
-        return 0
-    else:
-        return reduce(lambda x, y: (x+y), range(1,n+1))
-
+    return 0 if n < 1 else reduce(lambda x, y: (x+y), range(1,n+1))
 
 def tests(f):
     inputs = [[999], [-100]]
diff --git a/labs02/task05.py b/labs02/task05.py
index abfc03f..c1c8c51 100644
--- a/labs02/task05.py
+++ b/labs02/task05.py
@@ -12,10 +12,7 @@ import math
 
 
 def euclidean_distance(x, y):
-    a = y[0]-x[0]
-    b = y[1]-x[1]
-    c = y[2]-x[2]
-    return math.sqrt( math.sqrt(a**2+b**2)**2 + c**2)
+    return math.sqrt(math.sqrt((y[0] - x[0]) ** 2 + (y[1] - x[1]) ** 2) ** 2 + (y[2] - x[2]) ** 2)
 
 
 
diff --git a/labs02/task06.py b/labs02/task06.py
index b9de6a2..27bedcb 100644
--- a/labs02/task06.py
+++ b/labs02/task06.py
@@ -9,11 +9,9 @@ równa podanemu argumentem, przy czym jeśli argument jest mniejszy niż 5,
 ma być zwracany napis "It's not a Big 'No!'".
 """
 
+
 def big_no(n):
-    if n < 5:
-        return "It's not a Big 'No!'"
-    else:
-        return "N" + n*"O" + "!"
+    return "It's not a Big 'No!'" if n < 5 else  "N" + n * "O" + "!"
 
 
 def tests(f):
@@ -26,5 +24,6 @@ def tests(f):
             break
     return "TESTS PASSED"
 
+
 if __name__ == "__main__":
     print(tests(big_no))
diff --git a/labs02/task10.py b/labs02/task10.py
index 2247fb4..84ebc90 100644
--- a/labs02/task10.py
+++ b/labs02/task10.py
@@ -9,7 +9,7 @@ na wielką. Np. pokemon_speak('pokemon') powinno zwrócić 'PoKeMoN'.
 
 
 def pokemon_speak(text):
-    return ''.join( map( lambda t: t[0]+t[1], zip( text[::2].upper(), text[1::2] ) ) )
+    return ''.join([a if idx%2==1 else a.upper() for idx, a in enumerate(text)])
 
 
 def tests(f):
diff --git a/labs02/task11.py b/labs02/task11.py
index 7d36767..5d2e51e 100644
--- a/labs02/task11.py
+++ b/labs02/task11.py
@@ -9,7 +9,7 @@ Oba napisy będą składać się wyłacznie z małych liter.
 """
 
 def common_chars(string1, string2):
-    pass
+    return sorted( set(filter(lambda ch: ch.islower(), string1)).intersection(filter(lambda ch: ch.islower(), string2)) )
 
 
 def tests(f):