check if readline is available before calling readline functions in ipy_defaults.py

IPython/Extensions/ipy_defaults.py

@@ -1,59 +1,60 b''
 """ Set default options for IPython. 
 
 Just import this module to get reasonable defaults for everything.
 
 These configurations used to be performed in ipythonrc (or ipythonrc.ini). 
 Therefore importing this in your config files makes ipython basically
 ignore your ipythonrc. This is *not* imported by default, you need to import 
 this manually in one of your config files.
 
 You can further override these defaults in e.g. your ipy_user_config.py,
 ipy_profile_PROFILENAME etc.
 
 """
 
 import IPython.rlineimpl as readline
 import IPython.ipapi
 ip = IPython.ipapi.get()
 
 o = ip.options
 
 o.colors = "Linux"
 o.color_info=1
 o.confirm_exit=1
 o.pprint=1
 o.multi_line_specials=1
 o.xmode="Context"
 
 
 o.prompt_in1='In [\#]: '
 o.prompt_in2 ='   .\D.: '
 o.prompt_out = 'Out[\#]: '
 o.prompts_pad_left=1
 
 o.readline_remove_delims="-/~"
 o.readline_merge_completions=1
 
 o.readline = 1
 
 rlopts = """\
 tab: complete
 "\C-l": possible-completions
 set show-all-if-ambiguous on
 "\C-o": tab-insert
 "\M-i": "    "
 "\M-o": "\d\d\d\d"
 "\M-I": "\d\d\d\d"
 "\C-r": reverse-search-history
 "\C-s": forward-search-history
 "\C-p": history-search-backward
 "\C-n": history-search-forward
 "\e[A": history-search-backward
 "\e[B": history-search-forward
 "\C-k": kill-line
 "\C-u": unix-line-discard"""
 
-for cmd in rlopts.split('\n'):
-    readline.parse_and_bind(cmd)
+if readline.have_readline:
+    for cmd in rlopts.split('\n'):
+        readline.parse_and_bind(cmd)