Replace 'sage-python' with 'python3' in various scripts for Meson

Author: tobiasdiez

src/bin/sage

@@ -944,7 +944,7 @@ fi
 
 if [ "$1" = '-fixdistributions' -o "$1" = '--fixdistributions' ]; then
     shift
-    exec sage-python -m sage.misc.package_dir "$@"
+    exec python3 -m sage.misc.package_dir "$@"
 fi
 
 if [ "$1" = '-tox' -o "$1" = '--tox' ]; then
@@ -1012,7 +1012,7 @@ if [ "$1" = "-docbuild" -o "$1" = "--docbuild" ]; then
     # Redirect stdin from /dev/null. This helps with running TeX which
     # tends to ask interactive questions if something goes wrong. These
     # cause the build to hang. If stdin is /dev/null, TeX just aborts.
-    exec sage-python -m sage_docbuild "$@" </dev/null
+    exec python3 -m sage_docbuild "$@" </dev/null
 fi
 
 #####################################################################
@@ -1047,7 +1047,7 @@ if [ "$1" = '-gdb' -o "$1" = "--gdb" ]; then
         gdb --eval-command "run" \
             -args python "${SELF}-ipython" "$@" -i
     else
-        sage_dir=$(sage-python -c 'import os, sage; print(os.path.dirname(sage.__file__))')
+        sage_dir=$(python3 -c 'import os, sage; print(os.path.dirname(sage.__file__))')
         cygdb "$sage_dir" "$SAGE_SRC/sage" \
             -- --eval-command "run" \
             -args python "${SELF}-ipython" "$@" -i

src/bin/sage-fixdoctests

@@ -1,4 +1,4 @@
-#!/usr/bin/env sage-python
+#!/usr/bin/env python3
 """
 Given the output of doctest and a file, adjust the doctests so they won't fail.
 

src/bin/sage-list-packages

@@ -1,4 +1,4 @@
-#!/usr/bin/env sage-python
+#!/usr/bin/env python3
 r"""
 Script to list the Sage packages
 

src/bin/sage-runtests

@@ -1,9 +1,8 @@
-#!/usr/bin/env sage-python
+#!/usr/bin/env python3
 
 import sys
 
 from sage.doctest.__main__ import main
 
-
 if __name__ == "__main__":
     sys.exit(main())

src/bin/sage-startuptime.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env sage-python
+#!/usr/bin/env python3
 
 ########################################################################
 # Originally based on a script by Andrew Dalke:

src/doc/en/developer/packaging.rst

@@ -347,10 +347,6 @@ Likewise for :envvar:`CXXFLAGS`, :envvar:`FCFLAGS`, and :envvar:`F77FLAGS`.
     python3.  You should use this if you are installing a Python package
     to make sure that the libraries are installed in the right place.
 
-    By the way, there is also a script ``sage-python``. This should be
-    used at runtime, for example in scripts in ``SAGE_LOCAL/bin`` which
-    expect Sage's Python to already be built.
-
 Many packages currently do not separate the build and install steps and only
 provide a ``spkg-install.in`` file that does both.  The separation is useful in
 particular for root-owned install hierarchies, where something like ``sudo``

src/sage/categories/crystals.py

@@ -923,7 +923,7 @@ def latex_file(self, filename):
             Export a file, suitable for pdflatex, to ``filename``.
 
             This requires
-            a proper installation of ``dot2tex`` in sage-python. For more
+            a proper installation of ``dot2tex``. For more
             information see the documentation for ``self.latex()``.
 
             EXAMPLES::

src/sage/ext_data/nbconvert/postprocess.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env sage-python
+#!/usr/bin/env python3
 
 r"""
 This postprocess script fixes some issues with .rst files returned by nbconvert: