add K22

Author: wur89

22_closure/closure.py

@@ -0,0 +1,41 @@
+# Raymond Wu
+# SoftDev2 pd7
+# K22 -- Closure
+# 2019-04-30
+
+def repeat(word):
+    def repeater(count):
+        return word*count
+    return repeater
+
+r1 = repeat('hello') 
+print( r1(2) ) #hellohello
+
+r2 = repeat('goodbye')
+print( r2(2) ) #goodbyegoodbye
+
+print ( repeat('cool')(3) ) #coolcoolcool
+
+
+def make_counter():
+    x = 0
+    def counter():
+        nonlocal x
+        x += 1
+        return x
+    def accessor():
+        return x
+    return counter, accessor #returns tuple
+
+ctr1, acc1 = make_counter() #ctr1 is counter, acc1 is accessor
+print( ctr1() ) #1
+print( ctr1() ) #2
+print( acc1() ) #2
+ctr2, acc2 = make_counter() #ctr2 is counter, acc2 is accessor
+print( acc2() ) #0
+print( ctr2() ) #1
+print( ctr1() ) #3
+print( ctr2() ) #2
+print( acc1() ) #3
+print( acc2() ) #2
+print( acc2() ) #2