Added files for Ecoanova's Python 3 course.

Ecoanova/Introduccion a Python 3/Ejemplos/lists.py

@@ -0,0 +1,60 @@
+a = [1, 2, 3, 4, 5, 6, 7, 8, 9]
+
+#################
+# List indexing #
+#################
+
+# Classical position indexing
+
+i = 0
+while i < len(a):
+    print(a[i])
+    i += 1
+
+# Negative indices
+
+print(a[-1])
+print(a[-2])
+print(a[-3])
+
+################
+# List slicing #
+################
+
+# Elements between indices 3 and 7
+
+print(a[3:7])
+
+# Elements from index 5 onwards
+
+print(a[5:])
+
+# Elements from the start up to index 8
+
+print(a[:8])
+
+#######################
+# List comprehensions #
+#######################
+
+# The first 10 square natural numbers
+
+l = [x * x for x in range(1, 10)]
+print(l)
+
+# The first even square natural numbers
+
+l = [x * x for x in range(1, 10) if (x * x) % 2 == 0]
+print(l)
+
+# Some numbers from the first list
+
+l = [x for x in a if x > 2 and x < 7]
+print(l)
+
+#######
+# zip #
+#######
+
+l = [x for x in zip([1, 2, 3, 4], ["a", "b", "c"], ["Hello", ",", "World", "!"])]
+print(l)