Create unit6_ex6.2.4.py

Author: lironmiz

Diff for: unit6_ex6.2.4.py

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+# exercise 6.2.4 from unit 6
+
+'''
+Write a function called extend_list_x defined as follows:
+def extend_list_x(list_x, list_y):
+The function receives two lists list_y, list_x. The function expands list_x (changes it) so that it also contains list_y at the beginning, and returns list_x.
+
+An example of running the extend_list_x function
+>>> x = [4, 5, 6]
+>>> y = [1, 2, 3]
+>>> extend_list_x(x, y)
+[1, 2, 3, 4, 5, 6]
+Guidelines
+Do not use the '+' operator.
+Do not use the extend method.
+
+Attention, this is a challenge exercise... ready? Take your time, try to think outside
+the box and look for the trick to solve it.
+'''
+
+def extend_list_x(list_x, list_y):
+    list_x[:0] = list_y
+    return list_x
+
+def main():
+    x = [4, 5, 6]
+    y = [1, 2, 3]
+    extended_list = extend_list_x(x, y)
+    print(extended_list)
+
+if __name__ == "__main__":
+    main()