ch02

ch02/tuples.py

@@ -0,0 +1,29 @@
+# tuples.py
+
+
+>>> t = ()  # empty tuple
+>>> type(t)
+<class 'tuple'>
+>>> one_element_tuple = (42, )  # you need the comma!
+>>> three_elements_tuple = (1, 3, 5)  # braces are optional here
+>>> a, b, c = 1, 2, 3  # tuple for multiple assignment
+>>> a, b, c  # implicit tuple to print with one instruction
+(1, 2, 3)
+>>> 3 in three_elements_tuple  # membership test
+True
+
+
+# swap
+>>> a, b = 1, 2
+>>> c = a  # we need three lines and a temporary var c
+>>> a = b
+>>> b = c
+>>> a, b  # a and b have been swapped
+(2, 1)
+
+
+# pythonic swap
+>>> a, b = 0, 1
+>>> a, b = b, a  # this is the Pythonic way to do it
+>>> a, b
+(1, 0)