pyreadline version dependency not correctly checked

[matthew-brett]

Installing IPython on windows with python setup.py install and pyreadline 1.5:

C:\code\dev_trees\ipython [main-master]> ipython
Python 2.6.5 (r265:79096, Mar 19 2010, 21:48:26) [MSC v.1500 32 bit (Intel)]
Type "copyright", "credits" or "license" for more information.

IPython 0.13.dev -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.
Traceback (most recent call last):
  File "C:\Python26\Scripts\ipython-script.py", line 9, in 
    load_entry_point('ipython==0.13.dev', 'console_scripts', 'ipython')()
  File "C:\Python26\lib\site-packages\ipython-0.13.dev-py2.6.egg\IPython\frontend\terminal\ipapp.py", line 409, in launch_new_instance
    app.start()
  File "C:\Python26\lib\site-packages\ipython-0.13.dev-py2.6.egg\IPython\frontend\terminal\ipapp.py", line 383, in start
    self.shell.mainloop()
  File "C:\Python26\lib\site-packages\ipython-0.13.dev-py2.6.egg\IPython\frontend\terminal\interactiveshell.py", line 290, in mainloop
    self.interact(display_banner=display_banner)
  File "C:\Python26\lib\site-packages\ipython-0.13.dev-py2.6.egg\IPython\frontend\terminal\interactiveshell.py", line 346, in interact
    hlen_b4_cell = self.readline.get_current_history_length()
AttributeError: 'module' object has no attribute 'get_current_history_length'

I see that setup.py requires pyreadline >= 1.7.1, iff setupext.check_for_readline() returns False. However, in my case, it returns True because the function does not check the version, and I have version 1.5. I wasn't sure how best to put the version dependency into the function.

[alexlouden]

I just installed the latest version on Windows XP 32-bit (ugh) with pip:

> pip freeze
pyreadline==1.5
ipython==0.13.1

Getting the same error as above:

...
hlen_b4_cell = self.readline.get_current_history_length()
AttributeError: 'module' object has no attribute 'get_current_history_length'

I updated pyreadline (pyreadline==2.0-dev1), which fixed it.