Fix most trivially-findable print statements.

There's one major and one minor category still unfixed:
doctests are the major category (and I hope to be able to augment the
refactoring tool to refactor bona fide doctests soon);
other code generating print statements in strings is the minor category.

(Oh, and I don't know if the compiler package works.)
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 1b4ef89..759b59f 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -1165,8 +1165,8 @@
     # Example 1: Simple redirection: Get process list
     #
     plist = Popen(["ps"], stdout=PIPE).communicate()[0]
-    print "Process list:"
-    print plist
+    print("Process list:")
+    print(plist)
 
     #
     # Example 2: Change uid before executing child
@@ -1178,42 +1178,42 @@
     #
     # Example 3: Connecting several subprocesses
     #
-    print "Looking for 'hda'..."
+    print("Looking for 'hda'...")
     p1 = Popen(["dmesg"], stdout=PIPE)
     p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
-    print repr(p2.communicate()[0])
+    print(repr(p2.communicate()[0]))
 
     #
     # Example 4: Catch execution error
     #
-    print
-    print "Trying a weird file..."
+    print()
+    print("Trying a weird file...")
     try:
-        print Popen(["/this/path/does/not/exist"]).communicate()
+        print(Popen(["/this/path/does/not/exist"]).communicate())
     except OSError as e:
         if e.errno == errno.ENOENT:
-            print "The file didn't exist.  I thought so..."
-            print "Child traceback:"
-            print e.child_traceback
+            print("The file didn't exist.  I thought so...")
+            print("Child traceback:")
+            print(e.child_traceback)
         else:
-            print "Error", e.errno
+            print("Error", e.errno)
     else:
-        print >>sys.stderr, "Gosh.  No error."
+        print("Gosh.  No error.", file=sys.stderr)
 
 
 def _demo_windows():
     #
     # Example 1: Connecting several subprocesses
     #
-    print "Looking for 'PROMPT' in set output..."
+    print("Looking for 'PROMPT' in set output...")
     p1 = Popen("set", stdout=PIPE, shell=True)
     p2 = Popen('find "PROMPT"', stdin=p1.stdout, stdout=PIPE)
-    print repr(p2.communicate()[0])
+    print(repr(p2.communicate()[0]))
 
     #
     # Example 2: Simple execution of program
     #
-    print "Executing calc..."
+    print("Executing calc...")
     p = Popen("calc")
     p.wait()