autodetect Python 3.6 on the basis of underscores (#461)

[etc/vim.git] / black.py

diff --git a/black.py b/black.py
index c899bde36dbbb3fd4efdb6e9aaca7f03e5448d95..b65693e91d0cac0b5087b32397f22c64cee1b5e0 100644 (file)
--- a/black.py
+++ b/black.py
@@ -2891,7 +2891,8 @@ def is_python36(node: Node) -> bool:
     """Return True if the current file is using Python 3.6+ features.
 
     Currently looking for:
-    - f-strings; and
+    - f-strings;
+    - underscores in numeric literals; and
     - trailing commas after * or ** in function signatures and calls.
     """
     for n in node.pre_order():
@@ -2900,6 +2901,10 @@ def is_python36(node: Node) -> bool:
             if value_head in {'f"', 'F"', "f'", "F'", "rf", "fr", "RF", "FR"}:
                 return True
 
+        elif n.type == token.NUMBER:
+            if "_" in n.value:  # type: ignore
+                return True
+
         elif (
             n.type in {syms.typedargslist, syms.arglist}
             and n.children