csv2rdf not working

[lalewis1]

the csv2rdf tool appears to be in a broken state,

the below suggest changes fix 2 issues that I have identified and seems to get it working again.

issue 1: csv_reader() attempts to replace strings in a bytes object (always raises an error)
issue 2: --colx and --propx command line flags cannot be given because they are not registered with getopts

the fix for issue 2 that I have implemented, only fixes the issue for up to 100 columns, but probably this is fine. could easily be made larger.

diff --git a/rdflib/tools/csv2rdf.py b/rdflib/tools/csv2rdf.py
index d518e809..fff386f3 100644
--- a/rdflib/tools/csv2rdf.py
+++ b/rdflib/tools/csv2rdf.py
@@ -133,7 +133,7 @@ def csv_reader(csv_data, dialect=csv.excel, **kwargs):
 
 def prefixuri(x, prefix, class_: Optional[URIRef] = None):
     if prefix:
-        r = rdflib.URIRef(prefix + quote(x.encode("utf8").replace(" ", "_"), safe=""))
+        r = rdflib.URIRef(prefix + quote(x.encode("utf8").replace(b" ", b"_"), safe=""))
     else:
         r = rdflib.URIRef(x)
     uris[x] = (r, class_)
@@ -379,7 +379,7 @@ class CSV2RDF:
                         "_".join(
                             [
                                 # type error: "int" has no attribute "encode"
-                                quote(x.encode("utf8").replace(" ", "_"), safe="")  # type: ignore[attr-defined]
+                                quote(x.encode("utf8").replace(b" ", b"_"), safe="")  # type: ignore[attr-defined]
                                 # type error: Argument 2 to "index" has incompatible type "Union[Tuple[str, ...], str]"; expected "Tuple[int, ...]"
                                 for x in index(l_, self.IDENT)  # type: ignore[arg-type]
                             ]
@@ -472,7 +472,9 @@ def main():
             "skip=",
             "defineclass",
             "help",
-        ],
+        ]
+        + [f"col{i}=" for i in range(100)]
+        + [f"prop{i}=" for i in range(100)],
     )
     opts = dict(opts)