Issue #13886: Fix input() to not strip out supposedly-invalid input bytes.

Also fix sporadic failures in test_builtin due to dependence on whether the
readline module has previously been imported.

Lib/test/test_builtin.py

@@ -18,6 +18,13 @@ try:
     import pty, signal
 except ImportError:
     pty = signal = None
+# Importing this module has the side-effect of changing the behavior of input().
+# Ensure that we always use the readline version (if available), so we don't get
+# different results depending on what other tests have already imported.
+try:
+    import readline
+except ImportError:
+    pass
 
 
 class Squares:

Misc/NEWS

@@ -10,6 +10,10 @@ What's New in Python 3.2.4
 Core and Builtins
 -----------------
 
+- Issue #13886: Fix input() to not strip out input bytes that cannot be decoded
+  using the locale encoding. Also fix sporadic failures in test_builtin due to
+  dependence on whether the readline module has previously been imported.
+
 - Issue #10156: In the interpreter's initialization phase, unicode globals
   are now initialized dynamically as needed.
 

Modules/readline.c

@@ -1068,7 +1068,7 @@ call_readline(FILE *sys_stdin, FILE *sys_stdout, char *prompt)
     char *saved_locale = strdup(setlocale(LC_CTYPE, NULL));
     if (!saved_locale)
         Py_FatalError("not enough memory to save locale");
-    setlocale(LC_CTYPE, "");
+    setlocale(LC_CTYPE, "C");
 #endif
 
     if (sys_stdin != rl_instream || sys_stdout != rl_outstream) {