use builtin functions where possible

pipe.py

@@ -430,18 +430,12 @@ def skip(iterable, qte):
 @Pipe
 def all(iterable, pred):
     "Returns True if ALL elements in the given iterable are true for the given pred function"
-    for x in iterable:
-        if not pred(x):
-            return False
-    return True
+    return builtins.all(pred(x) for x in iterable)
 
 @Pipe
 def any(iterable, pred):
     "Returns True if ANY element in the given iterable is True for the given pred function"
-    for x in iterable:
-        if pred(x):
-            return True
-    return False
+    return builtins.any(pred(x) for x in iterable)
 
 @Pipe
 def average(iterable):
@@ -480,27 +474,8 @@ def as_dict(iterable):
 def permutations(iterable, r=None):
     # permutations('ABCD', 2) --> AB AC AD BA BC BD CA CB CD DA DB DC
     # permutations(range(3)) --> 012 021 102 120 201 210
-    pool = tuple(iterable)
-    n = len(pool)
-    r = n if r is None else r
-    if r > n:
-        return
-    indices = list(range(n))
-    cycles = list(range(n, n-r, -1))
-    yield tuple(pool[i] for i in indices[:r])
-    while n:
-        for i in reversed(range(r)):
-            cycles[i] -= 1
-            if cycles[i] == 0:
-                indices[i:] = indices[i+1:] + indices[i:i+1]
-                cycles[i] = n - i
-            else:
-                j = cycles[i]
-                indices[i], indices[-j] = indices[-j], indices[i]
-                yield tuple(pool[i] for i in indices[:r])
-                break
-        else:
-            return
+    for x in itertools.permutations(iterable, r):
+        yield x
 
 @Pipe
 def netcat(to_send, host, port):