Prototype of printf sample.

Mentions: #8

07_printf.py

@@ -0,0 +1,34 @@
+import numpy as np
+import pyopencl as cl
+
+def main():
+    CL_CODE = '''
+    kernel void hello(void) {
+      int i = 5;
+      long l = 5;
+      float f = 5.5;
+      char c = 'A';
+      constant char* s = "ABC";
+      size_t sz = 10;
+
+      printf("int %d\\n", i);
+      printf("long %d\\n", l);
+      printf("float %f\\n", f);
+      printf("char %c\\n", c);
+      printf("string %s\\n", s);
+      printf("size_t %d\\n", sz);
+    }
+    '''
+
+    plf = [(cl.context_properties.PLATFORM, cl.get_platforms()[0])]
+    ctx = cl.Context(dev_type=cl.device_type.CPU, properties=plf)
+    prg = cl.Program(ctx, CL_CODE).build()
+    queue = cl.CommandQueue(ctx)
+
+    mf = cl.mem_flags
+    host_s = cl.Buffer(ctx, mf.READ_ONLY | mf.COPY_HOST_PTR, hostbuf=bytearray(b'ABC\x00'))
+    prg.hello(queue, (1,), None)
+    queue.finish()
+
+if __name__ == '__main__':
+    main()