remove sq brackets

IPython/nbconvert/filters/latex.py

@@ -57,7 +57,7 def escape_latex(text):
     text : str
         Text containing characters that may conflict with Latex
     """
-    text = ''.join([LATEX_SUBS.get(c, c) for c in text])
+    text = ''.join(LATEX_SUBS.get(c, c) for c in text)
     for pattern, replacement in LATEX_RE_SUBS:
         text = pattern.sub(replacement, text)