Trac #27275: Fix readline.pyx for python3

src/sage/libs/readline.pyx

@@ -8,9 +8,10 @@ into it so we can make it redraw the input area.
 EXAMPLES::
 
     sage: from sage.libs.readline import *
+    sage: from sage.cpython.string import bytes_to_str
     sage: replace_line('foobar', 0)
     sage: set_point(3)
-    sage: print('current line: ' + repr(copy_text(0, get_end())))
+    sage: print('current line: ' + repr(bytes_to_str(copy_text(0, get_end()))))
     current line: 'foobar'
     sage: print('cursor position: {}'.format(get_point()))
     cursor position: 3
@@ -20,7 +21,8 @@ line is removed::
 
     sage: with interleaved_output():
     ....:     print('output')
-    ....:     print('current line: ' + repr(copy_text(0, get_end())))
+    ....:     print('current line: ' +
+    ....:            repr(bytes_to_str(copy_text(0, get_end()))))
     ....:     print('cursor position: {}'.format(get_point()))
     output
     current line: ''
@@ -29,7 +31,7 @@ line is removed::
 After the interleaved output, the line and cursor is restored to the
 old value::
 
-    sage: print('current line: ' + repr(copy_text(0, get_end())))
+    sage: print('current line: ' + repr(bytes_to_str(copy_text(0, get_end()))))
     current line: 'foobar'
     sage: print('cursor position: {}'.format(get_point()))
     cursor position: 3
@@ -49,6 +51,7 @@ Finally, clear the current line for the remaining doctests::
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 from __future__ import print_function
+from sage.cpython.string cimport str_to_bytes
 
 
 cdef extern from 'readline/readline.h':
@@ -202,8 +205,9 @@ def copy_text(pos_start, pos_end):
     EXAMPLES::
 
         sage: from sage.libs.readline import copy_text, replace_line
+        sage: from sage.cpython.string import bytes_to_str
         sage: replace_line('foobar', 0)
-        sage: copy_text(1, 5)
+        sage: bytes_to_str(copy_text(1, 5))
         'ooba'
     """
     return rl_copy_text(pos_start, pos_end)
@@ -224,11 +228,12 @@ def replace_line(text, clear_undo):
     EXAMPLES::
 
         sage: from sage.libs.readline import copy_text, replace_line
+        sage: from sage.cpython.string import bytes_to_str
         sage: replace_line('foobar', 0)
-        sage: copy_text(1, 5)
+        sage: bytes_to_str(copy_text(1, 5))
         'ooba'
     """
-    rl_replace_line(text, clear_undo)
+    rl_replace_line(str_to_bytes(text), clear_undo)
 
 def initialize():
     """