diff --git a/projects/002-recursive-decimal-to-binary/python/main.py b/projects/002-recursive-decimal-to-binary/python/main.py
index e69de29..3d9df37 100644
--- a/projects/002-recursive-decimal-to-binary/python/main.py
+++ b/projects/002-recursive-decimal-to-binary/python/main.py
@@ -0,0 +1,41 @@
+'''
+Write a recursive function that converts a non-negative decimal number to binary.
+
+Treat 0 and 1 as base cases which return a string containing the appropriate digit. 
+
+For all other positive integers, n, you should compute the next digit using the remainder operator and then 
+make a recursive call to compute the digits of n // 2.
+
+Finally, you should concatenate the result of the recursive call (which will be a string) 
+and the next digit (which you will need to convert to a string) and return this string as the result of the function.
+ 
+Write a main program that uses your recursive function to convert a non-negative integer 
+entered by the user from decimal to binary. 
+Your program should display an appropriate error message if the user enters a negative value.
+'''
+
+def conv(intuserinput, r, array):
+    if intuserinput == 0 or intuserinput == 1:
+        array.append(intuserinput)
+        array.reverse()
+        return array
+    elif intuserinput < 0:
+        print("ERROR: Insert non-negative number!!!")
+        intuserinput = int(input("Please insert a non-negative decimal number: "))
+        return conv(intuserinput, r, array)
+    elif intuserinput > 0:
+        r = intuserinput % 2
+        intuserinput = intuserinput // 2
+        array.append(r)
+        return conv(intuserinput, r, array)
+
+def main():
+    userinput = input("Please insert a non-negative decimal number: ")
+    intuserinput = int(userinput)
+    r = 0
+    array = []
+    x = conv(intuserinput, r, array)
+    print(x)
+
+if __name__ == '__main__':
+    main()
\ No newline at end of file
diff --git a/projects/003-string-edit-distance/python/main.py b/projects/003-string-edit-distance/python/main.py
index e69de29..139597f 100644
--- a/projects/003-string-edit-distance/python/main.py
+++ b/projects/003-string-edit-distance/python/main.py
@@ -0,0 +1,2 @@
+
+