diff --git a/IPython/core/history.py b/IPython/core/history.py
index afa05fa..ff931d2 100644
--- a/IPython/core/history.py
+++ b/IPython/core/history.py
@@ -862,7 +862,7 @@ def extract_hist_ranges(ranges_str):
     >>> list(extract_hist_ranges("~8/5-~7/4 2"))
     [(-8, 5, None), (-7, 1, 5), (0, 2, 3)]
     """
-    if ranges_str == '':
+    if ranges_str == "":
         yield (0, 1, None)  # Everything from current session
         return
 
diff --git a/IPython/core/interactiveshell.py b/IPython/core/interactiveshell.py
index 1846b3c..499d6b7 100644
--- a/IPython/core/interactiveshell.py
+++ b/IPython/core/interactiveshell.py
@@ -3722,10 +3722,10 @@ class InteractiveShell(SingletonConfigurable):
 
         # Skip the last line, as it's probably the magic that called this
         if not range_str:
-            if '\n' not in text:
-                text = ''
+            if "\n" not in text:
+                text = ""
             else:
-                text = text[:text.rfind('\n')]
+                text = text[: text.rfind("\n")]
 
         return text
 
diff --git a/IPython/core/magics/history.py b/IPython/core/magics/history.py
index 9762e6e..28f91fa 100644
--- a/IPython/core/magics/history.py
+++ b/IPython/core/magics/history.py
@@ -187,8 +187,9 @@ class HistoryMagics(Magics):
             if args.pattern:
                 range_pattern = "*" + " ".join(args.pattern) + "*"
                 print_nums = True
-            hist = history_manager.get_range_by_str(" ".join(args.range),
-                                                    raw, get_output)
+            hist = history_manager.get_range_by_str(
+                " ".join(args.range), raw, get_output
+            )
 
         # We could be displaying the entire history, so let's not try to pull
         # it into a list in memory. Anything that needs more space will just
diff --git a/IPython/core/magics/osm.py b/IPython/core/magics/osm.py
index e8d1cbd..c0cb209 100644
--- a/IPython/core/magics/osm.py
+++ b/IPython/core/magics/osm.py
@@ -817,8 +817,7 @@ class OSMagics(Magics):
         %pycat http://www.example.com/myscript.py
         """
         try:
-            cont = self.shell.find_user_code(parameter_s,
-                                             skip_encoding_cookie=False)
+            cont = self.shell.find_user_code(parameter_s, skip_encoding_cookie=False)
         except (ValueError, IOError):
             print("Error: no such file, variable, URL, history range or macro")
             return
diff --git a/IPython/core/tests/test_history.py b/IPython/core/tests/test_history.py
index 6f1d820..824ba1e 100644
--- a/IPython/core/tests/test_history.py
+++ b/IPython/core/tests/test_history.py
@@ -162,7 +162,7 @@ def test_extract_hist_ranges():
 
 
 def test_extract_hist_ranges_empty_str():
-    instr = ''
+    instr = ""
     expected = [(0, 1, None)]  # 0 == current session, None == to end
     actual = list(extract_hist_ranges(instr))
     nt.assert_equal(actual, expected)
diff --git a/IPython/core/tests/test_magic.py b/IPython/core/tests/test_magic.py
index b939c99..fd5696d 100644
--- a/IPython/core/tests/test_magic.py
+++ b/IPython/core/tests/test_magic.py
@@ -1091,7 +1091,7 @@ def test_save():
 
 def test_save_with_no_args():
     ip = get_ipython()
-    ip.history_manager.reset()   # Clear any existing history.
+    ip.history_manager.reset()  # Clear any existing history.
     cmds = [u"a=1", u"def b():\n    return a**2", u"print(a, b())", "%save"]
     for i, cmd in enumerate(cmds, start=1):
         ip.history_manager.store_inputs(i, cmd)