Explicitly invoke python3 (AMReX-Codes#2850)

According to PEP 394, a python distributor may choose to not provide the
python command.  In fact, that's what recent versions of macOS do.

Tools/Backtrace/parse_bt.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import re

Tools/C_scripts/describe_sources.py

@@ -1,10 +1,6 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
-
-if sys.version_info < (2, 7):
-    sys.exit("ERROR: need python 2.7 or later for dep.py")
-
 import argparse
 import os
 import subprocess

Tools/C_scripts/gatherbuildtime.py

@@ -1,11 +1,7 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
-from __future__ import print_function
 import sys, os, glob, operator, time
 
-if sys.version_info < (2, 7):
-    sys.exit("ERROR: need python 2.7 or later for dep.py")
-
 if __name__ == "__main__":
     dt = float(sys.argv[3])-float(sys.argv[2])
     hours, rem = divmod(dt, 3600)

Tools/CompileTesting/compiletesting.py

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
-from __future__ import print_function
 import sys
 import os
 import shlex
@@ -148,4 +147,3 @@ def run(command, outfile=None):
 
 if __name__ == "__main__":
     compiletesting(sys.argv[1:])
-

Tools/F_scripts/dep.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # automatically generate Makefile dependencies for Fortran 90 source.
 #
@@ -20,18 +20,7 @@
 #      (e.g. iso_c_binding).  Add any system-provided modules to the
 #      `IGNORES` list below
 
-from __future__ import print_function
-
 import sys
-
-if sys.version_info < (2, 7):
-    sys.exit("ERROR: need python 2.7 or later for dep.py")
-
-if sys.version[0] == "2":
-    reload(sys)
-    sys.setdefaultencoding('latin-1')
-
-
 import io
 import re
 import os

Tools/F_scripts/fcheck.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # a simple routine to parse Fortran files and make sure that things are
 # declared double precision, and constants are of the form 1.0_dp_t or
@@ -122,9 +122,3 @@ def visit(argFiles, dirname, files):
 
         if (badFile == 1):
             print " "
-
-
-
-
-
-

Tools/F_scripts/find_files_vpath.py

@@ -1,12 +1,10 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Take a vpath and a list of files and find where in the first vpath the
 first occurrence of the file.
 """
 
-from __future__ import print_function
-
 import sys
 import os
 import argparse

Tools/F_scripts/findparams.py

@@ -1,6 +1,4 @@
-#!/usr/bin/env python
-
-from __future__ import print_function
+#!/usr/bin/env python3
 
 import sys
 import os

Tools/F_scripts/makebuildinfo.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # a simple script that writes the build_info.f90 file that is used
 # to store information for the job_info file that we store in plotfiles.

Tools/F_scripts/write_probin.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """This routine parses plain-text parameter files that list runtime
 parameters for use in our codes.  The general format of a parameter
@@ -24,8 +24,6 @@
 
 """
 
-from __future__ import print_function
-
 import os
 import sys
 import argparse

Tools/GNUMake/Make.defs

@@ -1,8 +1,3 @@
-# Check python version
-my_python_version := $(word 2, $(shell python --version 2>&1))
-ifneq ($(firstword $(sort 2.7 $(my_python_version))), 2.7)
-  $(error Python >= 2.7 required! Your version is $(my_python_version))
-endif
 
 ifneq (,$(findstring ~,$(AMREX_HOME)))
   $(warning *** AMREX_HOME string constains ~ and make will not like it. So it is replaced.)

Tools/Postprocessing/python/column_depth.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import sys
 import numpy
 

Tools/Postprocessing/python/conv_slopes.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import sys
 import os
 import commands

Tools/Postprocessing/python/dumpparthistory.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # a simple routine to parse particle files and dump out the particle
 # histories into separate files (1 file per particle) so that they can
@@ -96,8 +96,3 @@ def main(files):
         sys.exit(2)
 
     main(sys.argv[1:])
-
-
-
-
-

Tools/Postprocessing/python/test_helmeos.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # a script showing how to use the helmeos module
 # it reads T, rho, X data from a sample data file, calculates abar and zbar

Tools/Postprocessing/python/test_parseparticles.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # simple script showing how to make plots of particles using the parseparticles
 # module
@@ -92,4 +92,3 @@ def main(fileList):
 
 # this is for profiling
 #    cProfile.run("main(sys.argv[1:])","profile.tmp2")
-

Tools/Py_util/plotsinglevar.py

@@ -1,11 +1,9 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # a simple script to plot 2-d or 3-d BoxLib data using the matplotlib
 # library
 #
 
-from __future__ import print_function
-
 import matplotlib
 matplotlib.use('agg')
 

Tools/Release/ppCleanup.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 import shutil

Tools/Release/ppCleanupDir.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 import shutil

Tools/Release/release.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 import shutil

Tools/libamrex/configure.py

@@ -1,12 +1,6 @@
-#!/usr/bin/env python
-
-from __future__ import print_function
+#!/usr/bin/env python3
 
 import sys
-
-if sys.version_info < (2, 7):
-    sys.exit("ERROR: need python 2.7 or later for configure.py")
-
 import argparse
 
 def configure(argv):

Tools/libamrex/mkconfig.py

@@ -1,12 +1,6 @@
-#!/usr/bin/env python
-
-from __future__ import print_function
+#!/usr/bin/env python3
 
 import sys, re
-
-if sys.version_info < (2, 7):
-    sys.exit("ERROR: need python 2.7 or later for mkconfig.py")
-
 import argparse
 
 def doit(defines, undefines, comp, allow_diff_comp):

Tools/libamrex/mkpkgconfig.py

@@ -1,12 +1,6 @@
-#!/usr/bin/env python
-
-from __future__ import print_function
+#!/usr/bin/env python3
 
 import sys
-
-if sys.version_info < (2, 7):
-    sys.exit("ERROR: need python 2.7 or later for mkpkgconfig.py")
-
 import argparse
 
 def doit(prefix, version, cflags, libs, libpriv, fflags):

Tools/libamrex/mkversionheader.py

@@ -1,12 +1,6 @@
-#!/usr/bin/env python
-
-from __future__ import print_function
+#!/usr/bin/env python3
 
 import sys, re
-
-if sys.version_info < (2, 7):
-    sys.exit("ERROR: need python 2.7 or later for mkversionheader.py")
-
 import argparse
 
 def doit(code, defines):

Tools/typechecker/typechecker.py

@@ -1,6 +1,4 @@
-#!/usr/bin/env python
-
-from __future__ import print_function
+#!/usr/bin/env python3
 
 import os
 import sys