rename l_function method name

fixes E743

pyproject.toml

@@ -41,7 +41,7 @@ build-backend = "mesonpy"
 
 [tool.cython-lint]
 max-line-length = 120
-ignore = ['E128','E129','E202','E221','E222','E261','E262','E265','E501','E731','E741','E743']
+ignore = ['E128','E129','E202','E221','E222','E261','E262','E265','E501','E731','E741']
 exclude = 'src/flint/flintlib/.*'
 
 [tool.spin]

src/flint/types/dirichlet.pyx

@@ -169,7 +169,7 @@ cdef class dirichlet_char(object):
         else:
             return fmpz(v)
 
-    def l(self, s):
+    def l_function(self, s):
         """
         Evaluates the Dirichlet L-function of this character at the given
         complex number s.
@@ -189,6 +189,9 @@ cdef class dirichlet_char(object):
         acb_dirichlet_l((<acb>v).val, (<acb>s).val, self.G.val, self.val, getprec())
         return v
 
+    # For backwards compatibility we allow self.l(s) see Issue #210
+    l = l_function # no-cython-lint
+
     def hardy_z(self, s):
         """
         Evaluates the Hardy Z-function of this character at the given