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---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-156-4180082d09fd> in <module>()
----> 1 sin(1/a).is_constant()

/home/aries/foss/sympy/sympy/core/expr.pyc in is_constant(self, *wrt, **flags)
    548                 except ZeroDivisionError:
    549                     b = None
--> 550                 if b is not None and b is not S.NaN and b.equals(a) is False:

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Note that `taylor` returns the answer in the form of Basic expr (though it does this 
smartly). Therefore, it has an extra( < 1% ) overhead compared to `series_fast`
1. series: p = (sin(a)+cos(a))**10, prec=10
series_fast: 1 loops, best of 3: 1.87 s per loop    taylor: too long

2. series: p = sin(a) + cos(a), prec=100
series_fast: 10 loops, best of 3: 113 ms per loop   taylor: 1 loops, best of 3: 181 ms per loop

3. series: p=sin(a)*cos(a)*sin(a)**2*cos(a)**3, prec=50
series_fast: 1 loops, best of 3: 336 ms per loop   taylor: 1 loops, best of 3: 1.2 s per loop

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=== test session starts ==============================
platform linux2 -- Python 2.7.9 -- py-1.4.25 -- pytest-2.6.3
collected 0 items / 21 errors 

==================================== ERRORS ====================================
_______________ ERROR collecting build/csympy/tests/test_arit.py _______________
../../Software/anaconda/lib/python2.7/site-packages/py/_path/local.py:630: in pyimport
    __import__(pkgpath.basename)
build/csympy/__init__.py:1: in <module>
    from .lib.csympy_wrapper import (Symbol, symbols, Integer, sympify, SympifyError, Add,

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python: /home/aries/gsoc/csympy/src/mul.cpp:16: CSymPy::Mul::Mul(const CSymPy::RCP<const CSymPy::Number>&, CSymPy::map_basic_basic&&): Assertion `is_canonical(coef, dict_)' failed.

Abort caught. Printing stacktrace:

Traceback (most recent call last):
  File unknown, in _start()
  File "/build/buildd/eglibc-2.19/csu/libc-start.c", line 287, in __libc_start_main()
  File "-------src-dir-------/Python-2.7.9/Modules/main.c", line 645, in Py_Main()
  File "-------src-dir-------/Python-2.7.9/Python/pythonrun.c", line 747, in PyRun_AnyFileExFlags()
  File "-------src-dir-------/Python-2.7.9/Python/pythonrun.c", line 778, in PyRun_InteractiveLoopFlags()

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diff --git a/sympy/plotting/tests/test_plot_implicit.py b/sympy/plotting/tests/test_plot_implicit.py
index 1eb6d88..d1787bd 100644
--- a/sympy/plotting/tests/test_plot_implicit.py
+++ b/sympy/plotting/tests/test_plot_implicit.py
@@ -5,19 +5,28 @@
 from tempfile import NamedTemporaryFile
 from sympy.utilities.pytest import skip
 from sympy.external import import_module
+from sympy.plotting.tests.test_plot import TmpFileManager
+from functools import wraps

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diff --git a/sympy/plotting/tests/test_plot_implicit.py b/sympy/plotting/tests/test_plot_implicit.py
index 1eb6d88..36dae3e 100644
--- a/sympy/plotting/tests/test_plot_implicit.py
+++ b/sympy/plotting/tests/test_plot_implicit.py
@@ -15,6 +15,7 @@ def tmp_file(name=''):
 
 
 def plot_and_save(name):
+    import matplotlib.pyplot as plt
     x = Symbol('x')