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/poplib.py b/Lib/poplib.py
index b7a7a8a..adf784f 100644
--- a/Lib/poplib.py
+++ b/Lib/poplib.py
@@ -100,14 +100,14 @@
 
 
     def _putline(self, line):
-        if self._debugging > 1: print '*put*', repr(line)
+        if self._debugging > 1: print('*put*', repr(line))
         self.sock.sendall('%s%s' % (line, CRLF))
 
 
     # Internal: send one command to the server (through _putline())
 
     def _putcmd(self, line):
-        if self._debugging: print '*cmd*', repr(line)
+        if self._debugging: print('*cmd*', repr(line))
         self._putline(line)
 
 
@@ -117,7 +117,7 @@
 
     def _getline(self):
         line = self.file.readline()
-        if self._debugging > 1: print '*get*', repr(line)
+        if self._debugging > 1: print('*get*', repr(line))
         if not line: raise error_proto('-ERR EOF')
         octets = len(line)
         # server can send any combination of CR & LF
@@ -135,7 +135,7 @@
 
     def _getresp(self):
         resp, o = self._getline()
-        if self._debugging > 1: print '*resp*', repr(resp)
+        if self._debugging > 1: print('*resp*', repr(resp))
         c = resp[:1]
         if c != '+':
             raise error_proto(resp)
@@ -209,7 +209,7 @@
         """
         retval = self._shortcmd('STAT')
         rets = retval.split()
-        if self._debugging: print '*stat*', repr(rets)
+        if self._debugging: print('*stat*', repr(rets))
         numMessages = int(rets[1])
         sizeMessages = int(rets[2])
         return (numMessages, sizeMessages)
@@ -375,7 +375,7 @@
             match = renewline.match(self.buffer)
         line = match.group(0)
         self.buffer = renewline.sub('' ,self.buffer, 1)
-        if self._debugging > 1: print '*get*', repr(line)
+        if self._debugging > 1: print('*get*', repr(line))
 
         octets = len(line)
         if line[-2:] == CRLF:
@@ -385,7 +385,7 @@
         return line[:-1], octets
 
     def _putline(self, line):
-        if self._debugging > 1: print '*put*', repr(line)
+        if self._debugging > 1: print('*put*', repr(line))
         line += CRLF
         bytes = len(line)
         while bytes > 0:
@@ -409,15 +409,15 @@
 if __name__ == "__main__":
     import sys
     a = POP3(sys.argv[1])
-    print a.getwelcome()
+    print(a.getwelcome())
     a.user(sys.argv[2])
     a.pass_(sys.argv[3])
     a.list()
     (numMsgs, totalSize) = a.stat()
     for i in range(1, numMsgs + 1):
         (header, msg, octets) = a.retr(i)
-        print "Message %d:" % i
+        print("Message %d:" % i)
         for line in msg:
-            print '   ' + line
-        print '-----------------------'
+            print('   ' + line)
+        print('-----------------------')
     a.quit()