Remove asserts from Python testcase

Also rename testcase python_pybuf to python_pybuffer.

Examples/test-suite/python/python_pybuffer_runme.py

@@ -0,0 +1,46 @@
+# run:
+#  python python_pybuffer_runme.py benchmark
+# for the benchmark, other wise the test case will be run
+import python_pybuffer
+import sys
+
+def check(flag):
+    if not flag:
+        raise RuntimeError("Test failed")
+
+if len(sys.argv) >= 2 and sys.argv[1] == "benchmark":
+    # run the benchmark
+    import time
+    k = 1000000  # number of times to execute the functions
+
+    t = time.time()
+    a = bytearray(b'hello world')
+    for i in range(k):
+        python_pybuffer.title1(a)
+    print "Time used by bytearray:", time.time() - t
+
+    t = time.time()
+    b = 'hello world'
+    for i in range(k):
+        python_pybuffer.title2(b)
+    print "Time used by string:", time.time() - t
+else:
+    # run the test case
+    buf1 = bytearray(10)
+    buf2 = bytearray(50)
+
+    python_pybuffer.func1(buf1)
+    check(buf1 == b'a' * 10)
+
+    python_pybuffer.func2(buf2)
+    check(buf2.startswith(b"Hello world!\x00"))
+
+    count = python_pybuffer.func3(buf2)
+    check(count == 10)  # number of alpha and number in 'Hello world!'
+
+    length = python_pybuffer.func4(buf2)
+    check(length == 12)
+
+    buf3 = bytearray(b"hello")
+    python_pybuffer.title1(buf3)
+    check(buf3 == b'Hello')