From cd78243b8269bf12aa056bd8ce70587dc9368246 Mon Sep 17 00:00:00 2001
From: Erez Sh <erezshin@gmail.com>
Date: Mon, 16 Nov 2020 14:02:21 +0200
Subject: [PATCH] Examples: Added new syntax to python grammar

---
 examples/advanced/python3.lark | 2 +-
 lark/grammars/python.lark      | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/examples/advanced/python3.lark b/examples/advanced/python3.lark
index 9be6b43..803a21b 100644
--- a/examples/advanced/python3.lark
+++ b/examples/advanced/python3.lark
@@ -23,7 +23,7 @@ decorated: decorators (classdef | funcdef | async_funcdef)
 async_funcdef: "async" funcdef
 funcdef: "def" NAME "(" parameters? ")" ["->" test] ":" suite
 
-parameters: paramvalue ("," paramvalue)* ["," [ starparams | kwparams]]
+parameters: paramvalue ("," paramvalue)* ["," "/"] ["," [starparams | kwparams]]
           | starparams
           | kwparams
 starparams: "*" typedparam? ("," paramvalue)* ["," kwparams]
diff --git a/lark/grammars/python.lark b/lark/grammars/python.lark
index ba2b852..684193d 100644
--- a/lark/grammars/python.lark
+++ b/lark/grammars/python.lark
@@ -6,11 +6,11 @@ COMMENT: /#[^\n]*/
 STRING : /[ubf]?r?("(?!"").*?(?<!\\)(\\\\)*?"|'(?!'').*?(?<!\\)(\\\\)*?')/i
 LONG_STRING: /[ubf]?r?(""".*?(?<!\\)(\\\\)*?"""|'''.*?(?<!\\)(\\\\)*?''')/is
 
-DEC_NUMBER: /0|[1-9]\d*/i
+DEC_NUMBER: /0|[1-9][\d_]*/i
 HEX_NUMBER.2: /0x[\da-f]*/i
 OCT_NUMBER.2: /0o[0-7]*/i
 BIN_NUMBER.2 : /0b[0-1]*/i
-FLOAT_NUMBER.2: /((\d+\.\d*|\.\d+)(e[-+]?\d+)?|\d+(e[-+]?\d+))/i
+FLOAT_NUMBER.2: /((\d+\.[\d_]*|\.[\d_]+)(e[-+]?\d+)?|\d+(e[-+]?\d+))/i
 IMAG_NUMBER.2: /\d+j/i | FLOAT_NUMBER "j"i