update bundled profiles to use extend

IPython/config/profile/cluster/ipython_config.py

@@ -9,11 +9,5 b' lines = """'
 from IPython.parallel import *
 """
 
-# You have to make sure that attributes that are containers already
-# exist before using them.  Simple assigning a new list will override
-# all previous values.
-if hasattr(app, 'exec_lines'):
-    app.exec_lines.append(lines)
-else:
-    app.exec_lines = [lines]
+app.exec_lines.append(lines)
 

IPython/config/profile/math/ipython_config.py

@@ -10,12 +10,4 b' import cmath'
 from math import *
 """
 
-# You have to make sure that attributes that are containers already
-# exist before using them.  Simple assigning a new list will override
-# all previous values.
-
-if hasattr(app, 'exec_lines'):
-    app.exec_lines.append(lines)
-else:
-    app.exec_lines = [lines]
-
+app.exec_lines.append(lines)

IPython/config/profile/pysh/ipython_config.py

@@ -21,10 +21,4 b' lines = """'
 %rehashx
 """
 
-# You have to make sure that attributes that are containers already
-# exist before using them.  Simple assigning a new list will override
-# all previous values.
-if hasattr(app, 'exec_lines'):
-    app.exec_lines.append(lines)
-else:
-    app.exec_lines = [lines]
+app.exec_lines.append(lines)

IPython/config/profile/sympy/ipython_config.py

@@ -13,18 +13,8 b" k, m, n = symbols('k m n', integer=True)"
 f, g, h = symbols('f g h', cls=Function)
 """
 
-# You have to make sure that attributes that are containers already
-# exist before using them.  Simple assigning a new list will override
-# all previous values.
-
-if hasattr(app, 'exec_lines'):
-    app.exec_lines.append(lines)
-else:
-    app.exec_lines = [lines]
+app.exec_lines.append(lines)
 
 # Load the sympy_printing extension to enable nice printing of sympy expr's.
-if hasattr(app, 'extensions'):
-    app.extensions.append('sympyprinting')
-else:
-    app.extensions = ['sympyprinting']
+app.extensions.append('sympy.interactive.ipythonprinting')