diff --git a/exercises/series/series.py b/exercises/series/series.py
index f955c12e84..3b59aa9a7f 100644
--- a/exercises/series/series.py
+++ b/exercises/series/series.py
@@ -1,2 +1,2 @@
-def slices():
+def slices(series, length):
     pass
diff --git a/exercises/trinary/trinary.py b/exercises/trinary/trinary.py
index cb41044110..c1120e2ce4 100644
--- a/exercises/trinary/trinary.py
+++ b/exercises/trinary/trinary.py
@@ -1,2 +1,2 @@
-def trinary():
+def trinary(s):
     pass
diff --git a/exercises/twelve-days/twelve_days.py b/exercises/twelve-days/twelve_days.py
index 0d17418086..8e1cb467c3 100644
--- a/exercises/twelve-days/twelve_days.py
+++ b/exercises/twelve-days/twelve_days.py
@@ -1,8 +1,8 @@
-def verse():
+def verse(n):
     pass
 
 
-def verses():
+def verses(startvalue, endvalue):
     pass
 
 
diff --git a/exercises/two-fer/two_fer.py b/exercises/two-fer/two_fer.py
index e75f4e565c..69facce636 100644
--- a/exercises/two-fer/two_fer.py
+++ b/exercises/two-fer/two_fer.py
@@ -1,2 +1,2 @@
-def two_fer():
+def two_fer(name=""):
     pass
diff --git a/exercises/variable-length-quantity/variable_length_quantity.py b/exercises/variable-length-quantity/variable_length_quantity.py
index 2536c2e670..28a7e9e93c 100644
--- a/exercises/variable-length-quantity/variable_length_quantity.py
+++ b/exercises/variable-length-quantity/variable_length_quantity.py
@@ -1,6 +1,6 @@
-def encode():
+def encode(numbers):
     pass
 
 
-def decode():
+def decode(bytes):
     pass
diff --git a/exercises/word-count/word_count.py b/exercises/word-count/word_count.py
index d1741341da..3235a2cf1d 100644
--- a/exercises/word-count/word_count.py
+++ b/exercises/word-count/word_count.py
@@ -1,2 +1,2 @@
-def word_count():
+def word_count(text):
     pass
diff --git a/exercises/wordy/wordy.py b/exercises/wordy/wordy.py
index e765101584..fbd28d0ead 100644
--- a/exercises/wordy/wordy.py
+++ b/exercises/wordy/wordy.py
@@ -1,2 +1,2 @@
-def calculate():
+def calculate(stmt):
     pass