@@ -284,6 +284,35 @@ Otherwise user code can fail at runtime arbitrarily later in the future, which c
284284be a difficult to debug and fix. Get inspiration from the message of failure at
285285runtime, and adapt for installation time.
286286
287+
288+ Here is for a simple version of how IPython handle old versions of Python and
289+ Pip that still try to install IPython 7.0+ on Python` < (3,4) ` .
290+
291+ ``` python
292+ if sys.version_info< (3 ,4 ):
293+
294+ error= """
295+ IPython 7.0+ supports Python 3.4 and above.
296+ When using Python 2.7, please install IPython 5.x LTS Long Term Support version.
297+ Python 3.3 was supported up to IPython 6.x.
298+
299+ See IPython `README.rst` file for more information:
300+
301+ https://github.com/ipython/ipython/blob/master/README.rst
302+
303+ Python{py} detected.
304+
305+ Try upgrading pip and retry.
306+ """ py = ' .' str (v)for vin sys.version_info[:3 ]]))
307+
308+ print (error,file = sys.stderr)
309+ sys.exit(1 )
310+ ```
311+
312+ You can look at the[ full
313+ check] ( https://github.com/ipython/ipython/blob/6a3e2db0c299dc05e636653c4a43d0aa756fb1c8/setup.py#L23-L58 )
314+ that attempt to detect which version of pip is in used.
315+
287316##Fix dependant libraries
288317
289318If you control dependant packages, Make sure to include conditional dependencies