Fixing declaration without variable

modules/Variables.py

@@ -33,7 +33,7 @@ class Variables:
 
 
         def checkType(self, value, typ) -> bool:
-            return type(value) == self.types[typ]
+            return value is None or type(value) == self.types[typ]
 
         def default(self, typ):
             if typ == "entier":
@@ -52,17 +52,27 @@ class Variables:
     def get(self, name):
         assert name in self.variables, "la variable {name} n'éxiste pas"
         if self.trace:
-            print(f"{trace_format}accède {name}{reset_format}", file=sys.stdout)
+            print(f"{trace_format}accède {name}{reset_format}", file=sys.stderr)
         return self.variables[name]
 
     def declare(self, typ, name, value=None):
         assert name not in self.variables, "la variable {name} existe déjà"
         self.variables[name] = self.Variable(typ, value)
         if self.trace:
-            print(f"{trace_format}déclare {name} = {value}{reset_format}", file=sys.stdout)
+            print(f"{trace_format}déclare {name} = {value}{reset_format}", file=sys.stderr)
 
     def assign(self, name, value):
         assert name in self.variables, "la variable n'éxiste pas"
         self.variables[name].set(value)
         if self.trace:
-            print(f"{trace_format}modifie {name} = {value}{reset_format}", file=sys.stdout)
+            print(f"{trace_format}modifie {name} = {value}{reset_format}", file=sys.stderr)
+
+    def dump(self):
+        name_len = max(map(len, self.variables.keys()))
+        var_len = max(map(len,map(str, self.variables.values())))
+        print(f"┌{'─' * name_len}┬{'─' * var_len}┐", file=sys.stderr)
+        print(f"│{'Name':>{name_len}}│{'Value':<{var_len}}│", file=sys.stderr)
+        print(f"├{'─' * name_len}┼{'─' * var_len}┤", file=sys.stderr)
+        for name, var in self.variables.items():
+            print(f"│{name:>{name_len}}│{str(var):<{var_len}}│", file=sys.stderr)
+        print(f"└{'─' * name_len}┴{'─' * var_len}┘", file=sys.stderr)