Remove f-string compatibility code, no longer needed.

pip_run/scripts.py

@@ -4,7 +4,6 @@
 import tokenize
 import itertools
 import io
-import re
 
 
 try:
@@ -88,7 +87,7 @@ def read(self):
         return deps
 
     def _read(self, var_name):
-        mod = ast.parse(self._fstring_compat(self.script))
+        mod = ast.parse(self.script)
         (node,) = (
             node
             for node in mod.body
@@ -99,20 +98,6 @@ def _read(self, var_name):
         )
         return ast.literal_eval(node.value)
 
-    @staticmethod
-    def _fstring_compat(script):
-        if sys.version_info > (3, 6):
-            return script
-
-        removed = re.sub(
-            r'^\s*#.*coding:\s*future_fstrings.*$', '', script, flags=re.MULTILINE
-        )
-
-        def strip_f(match):
-            return match.group(0)[1:]
-
-        return re.sub(r'\bf[\'"]', strip_f, removed)
-
 
 def run(cmdline):
     """