X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/b53cb9474348e13533ccba3735191a55ef3da6c4..e069017178e7ea02b3bbacab63e951015621f5c4:/black.py

diff --git a/black.py b/black.py
index 0f166c6..3a51f21 100644
--- a/black.py
+++ b/black.py
@@ -2522,8 +2522,8 @@ def normalize_string_quotes(leaf: Leaf) -> None:
 def normalize_numeric_literal(leaf: Leaf, allow_underscores: bool) -> None:
     """Normalizes numeric (float, int, and complex) literals.
 
-    All letters used in the representation are normalized to lowercase, long number
-    literals are split using underscores.
+    All letters used in the representation are normalized to lowercase (except
+    in Python 2 long literals), and long number literals are split using underscores.
     """
     text = leaf.value.lower()
     if text.startswith(("0o", "0x", "0b")):
@@ -2543,6 +2543,9 @@ def normalize_numeric_literal(leaf: Leaf, allow_underscores: bool) -> None:
     elif text.endswith(("j", "l")):
         number = text[:-1]
         suffix = text[-1]
+        # Capitalize in "2L" because "l" looks too similar to "1".
+        if suffix == "l":
+            suffix = "L"
         text = f"{format_float_or_int_string(number, allow_underscores)}{suffix}"
     else:
         text = format_float_or_int_string(text, allow_underscores)
@@ -2556,14 +2559,22 @@ def format_float_or_int_string(text: str, allow_underscores: bool) -> str:
 
     before, after = text.split(".")
     before = format_int_string(before, allow_underscores) if before else "0"
-    after = format_int_string(after, allow_underscores) if after else "0"
+    if after:
+        after = format_int_string(after, allow_underscores, count_from_end=False)
+    else:
+        after = "0"
     return f"{before}.{after}"
 
 
-def format_int_string(text: str, allow_underscores: bool) -> str:
+def format_int_string(
+    text: str, allow_underscores: bool, count_from_end: bool = True
+) -> str:
     """Normalizes underscores in a string to e.g. 1_000_000.
 
-    Input must be a string of at least six digits and optional underscores.
+    Input must be a string of digits and optional underscores.
+    If count_from_end is False, we add underscores after groups of three digits
+    counting from the beginning instead of the end of the strings. This is used
+    for the fractional part of float literals.
     """
     if not allow_underscores:
         return text
@@ -2573,9 +2584,12 @@ def format_int_string(text: str, allow_underscores: bool) -> str:
         # No underscores for numbers <= 6 digits long.
         return text
 
-    # Avoid removing leading zeros, which are important if we're formatting
-    # part of a number like "0.001".
-    return format(int("1" + text), "3_")[1:].lstrip("_")
+    if count_from_end:
+        # Avoid removing leading zeros, which are important if we're formatting
+        # part of a number like "0.001".
+        return format(int("1" + text), "3_")[1:].lstrip("_")
+    else:
+        return "_".join(text[i : i + 3] for i in range(0, len(text), 3))
 
 
 def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: