diff --git a/bopytex/bopytex.py b/bopytex/bopytex.py
index 069fe78..a75d56f 100755
--- a/bopytex/bopytex.py
+++ b/bopytex/bopytex.py
@@ -12,10 +12,10 @@ import sys
 
 from path import Path
 import pytex
-from mapytex import Expression
+from mapytex import Expression, Integer, Decimal
 import bopytex.filters as filters
 
-formatter = logging.Formatter('%(name)s :: %(levelname)s :: %(message)s')
+formatter = logging.Formatter("%(name)s :: %(levelname)s :: %(message)s")
 steam_handler = logging.StreamHandler()
 steam_handler.setLevel(logging.DEBUG)
 steam_handler.setFormatter(formatter)
@@ -29,6 +29,8 @@ def setup():
     logger.debug(f"Render for Expression is {Expression.RENDER}")
     mapytex_tools = {
         "Expression": Expression,
+        "Integer": Integer,
+        "Decimal": Decimal,
         # "Polynom": mapytex.Polynom,
         # "Fraction": mapytex.Fraction,
         # "Equation": mapytex.Equation,
@@ -36,7 +38,7 @@ def setup():
         # "random_pythagore": mapytex.random_pythagore,
         # "Dataset": mapytex.Dataset,
         # "WeightedDataset": mapytex.WeightedDataset,
-        }
+    }
     pytex.update_export_dict(mapytex_tools)
 
     pytex.add_filter("calculus", filters.do_calculus)
@@ -50,24 +52,25 @@ def get_working_dir(options):
         try:
             template = Path(options.template)
         except TypeError:
-            raise ValueError("Need to set the working directory \
-                    or to give a template")
+            raise ValueError(
+                "Need to set the working directory \
+                    or to give a template"
+            )
         else:
             working_dir = template.dirname()
     logger.debug(f"The output directory will be {working_dir}")
     return working_dir
 
 
-def activate_printanswers(texfile):
+def activate_printanswers(
+    texfile, noans=r"solution/print = false", ans=r"solution/print = true"
+):
     """ Activate printanswers mod in texfile """
     output_fname = "corr_" + texfile
-    with open(texfile, 'r') as input_f:
+    with open(texfile, "r") as input_f:
         with open(output_fname, "w") as output_f:
             for line in input_f.readlines():
-                output_f.write(line.replace(
-                    r'solution/print = false',
-                    r'solution/print = true',
-                    ))
+                output_f.write(line.replace(noans, ans))
     return output_fname
 
 
@@ -109,25 +112,14 @@ def produce_and_compile(options):
         template = Path(options.template).name
         logger.debug(f"Template will be {template}")
 
-        list_infos = [
-            {"num": f"{i+1:02d}"}
-            for i in range(options.num_subj)
-            ]
+        list_infos = [{"num": f"{i+1:02d}"} for i in range(options.num_subj)]
 
         tex_files = []
         for infos in list_infos:
-            dest = (
-                working_dir
-                / Path(template.replace("tpl", infos["num"]))
-                )
+            dest = working_dir / Path(template.replace("tpl", infos["num"]))
             logger.debug(f"Feeding template toward {dest}")
             tex_files.append(dest)
-            pytex.feed(
-                working_dir/template,
-                {"infos": infos},
-                output=dest,
-                force=1
-                )
+            pytex.feed(working_dir / template, {"infos": infos}, output=dest, force=1)
             logger.debug(f"{dest} fed")
 
         if not options.no_compil:
@@ -142,10 +134,10 @@ def produce_and_compile(options):
         if not options.no_join and not options.no_compil:
             pdfjoin(
                 pdf_files,
-                template.replace('tpl', "all").replace(".tex",".pdf"),
+                template.replace("tpl", "all").replace(".tex", ".pdf"),
                 working_dir,
-                rm_pdfs=1
-                )
+                rm_pdfs=1,
+            )
 
     if options.corr:
         pdf_files = []
@@ -161,10 +153,10 @@ def produce_and_compile(options):
         if not options.no_join and not options.no_compil:
             pdfjoin(
                 pdf_files,
-                template.replace('tpl', "corr").replace(".tex",".pdf"),
+                template.replace("tpl", "corr").replace(".tex", ".pdf"),
                 working_dir,
-                rm_pdfs=1
-                )
+                rm_pdfs=1,
+            )
 
     if not options.dirty:
         pytex.clean(working_dir)
@@ -180,60 +172,60 @@ def main():
         action="store",
         type="string",
         dest="template",
-        help="File with the template. The name should have the following form tpl_... ."
-        )
+        help="File with the template. The name should have the following form tpl_... .",
+    )
     parser.add_option(
         "-w",
         "--working-dir",
         action="store",
         type="string",
         dest="working_dir",
-        help="Where fed templates and compiled files will be placed"
-        )
+        help="Where fed templates and compiled files will be placed",
+    )
     parser.add_option(
         "-N",
         "--number_subjects",
         action="store",
         type="int",
         dest="num_subj",
-        default = 1,
-        help="The number of subjects to make"
-        )
+        default=1,
+        help="The number of subjects to make",
+    )
     parser.add_option(
         "-d",
         "--dirty",
         action="store_true",
         dest="dirty",
-        help="Do not clean after compilation"
-        )
+        help="Do not clean after compilation",
+    )
     parser.add_option(
         "-n",
         "--no-compile",
         action="store_true",
         dest="no_compil",
-        help="Do not compile source code"
-        )
+        help="Do not compile source code",
+    )
     parser.add_option(
         "-j",
         "--no-join",
         action="store_true",
         dest="no_join",
-        help="Do not join pdf and clean single pdf"
-        )
+        help="Do not join pdf and clean single pdf",
+    )
     parser.add_option(
         "-O",
         "--only-corr",
         action="store_true",
         dest="only_corr",
-        help="Create and compile only correction from existing subjects"
-        )
+        help="Create and compile only correction from existing subjects",
+    )
     parser.add_option(
         "-c",
         "--corr",
         action="store_true",
         dest="corr",
-        help="Create and compile correction while making subjects"
-        )
+        help="Create and compile correction while making subjects",
+    )
 
     (options, _) = parser.parse_args()
 
@@ -246,7 +238,7 @@ def main():
     produce_and_compile(options)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()