# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1480527719 -3600
# Node ID ea96958037c684cc0d49d5f6b9e8210bff298275
# Parent  88b64124852b8a372dc6215ddaad8e5bf7643f98
Implemented the zip function.

diff -r 88b64124852b -r ea96958037c6 lib/__builtins__/iterable.py
--- a/lib/__builtins__/iterable.py	Wed Nov 30 18:41:04 2016 +0100
+++ b/lib/__builtins__/iterable.py	Wed Nov 30 18:41:59 2016 +0100
@@ -69,6 +69,32 @@
 def reversed(sequence): pass
 def sorted(iterable, cmp=None, key=None, reverse=False): pass
 def sum(sequence, start=0): pass
-def zip(*args): pass
+
+def zip(args):
+
+    """
+    Zip the given 'args' together, producing for each index position tuples
+    containing the values for that position from each of the 'args'.
+    """
+
+    result = []
+    pos = 0
+
+    # Repeat until one of the arguments runs out of elements.
+
+    while True:
+        l = []
+
+        # Visit each argument in turn, collecting elements in the given
+        # position.
+
+        for arg in args:
+            try:
+                l.append(arg[pos])
+            except IndexError:
+                return result
+
+        result.append(tuple(l))
+        pos += 1
 
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