Remove useless call to u_format and redundant list comprehension

One step toward  #11987

IPython/core/tests/test_handlers.py

@@ -49,11 +49,11 b' def test_handlers():'
     # For many of the below, we're also checking that leading whitespace
     # turns off the esc char, which it should unless there is a continuation
     # line.
-    run([(i,py3compat.u_format(o)) for i,o in \
+    run(
         [('"no change"', '"no change"'),             # normal
          (u"lsmagic",     "get_ipython().run_line_magic('lsmagic', '')"),   # magic
          #("a = b # PYTHON-MODE", '_i'),          # emacs -- avoids _in cache
-         ]])
+         ])
 
     # Objects which are instances of IPyAutocall are *always* autocalled
     autocallable = Autocallable()