Doc: how to create a Python wheel

doc/languages-frameworks/python.md

@@ -748,6 +748,23 @@ in newpkgs.python35.withPackages (ps: [ps.blaze])
 ```
 The requested package `blaze` depends upon `pandas` which itself depends on `scipy`.
 
+### `python setup.py bdist_wheel` cannot create .whl
+
+Executing `python setup.py bdist_wheel` fails with
+```
+ValueError: ZIP does not support timestamps before 1980
+```
+This is because files are included that depend on items in the Nix store which have a timestamp of, that is, it corresponds to January the 1st, 1970 at 00:00:00. And as the error informs you, ZIP does not support that.
+Fortunately `bdist_wheel` takes into account `SOURCE_DATE_EPOCH`. On Nix this value is set to 1. By setting it to a value correspond to 1980 or later it is possible to build wheels.
+
+Use 1980 as timestamp:
+```
+SOURCE_DATE_EPOCH=315532800 python3 setup.py bdist_wheel
+```
+or the current time:
+```
+SOURCE_DATE_EPOCH=$(date +%s) python3 setup.py bdist_wheel
+```
 
 ### `install_data` / `data_files` problems