Well, either upgrading to Python 2.7.1 or running ./setup.py clean did
help (However, I used py.cleanup before reporting any of this. And I
was able reproduce it with a clean clone.). Now I get a much nicer
failure:
executable: /usr/bin/python2 (2.7.1-final-0)
sympy/solvers/tests/
test_solvers.py[18] ..............F... [FAIL]
________________________________________________________________________________
______________ sympy/solvers/tests/test_solvers.py:test_tsolve_1
_______________
File "/home/one/src/sympy/sympy/solvers/tests/test_solvers.py", line
232, in test_tsolve_1
[-((4*log(7) +
5*LambertW(-7*2**Rational(4,5)*6**Rational(1,5)*log(7)/10))/
(3*log(7)))]]
AssertionError
============= tests finished: 17 passed, 1 failed, in 2.82 seconds
=============
DO *NOT* COMMIT!
In isympy:
In [1]: solve(2*(3*x+4)**5 - 6*7**(3*x+9), x)
Out[1]:
⎡ ⎛ ⎛ 5 ⎽⎽⎽ ⎞⎞⎤
⎢ ⎜ ⎜-7⋅╲╱ 3 ⋅log(7)⎟⎟⎥
⎢-⎜4⋅log(7) + 5⋅LambertW⎜───────────────⎟⎟⎥
⎢ ⎝ ⎝ 5 ⎠⎠⎥
⎢─────────────────────────────────────────⎥
⎣ 3⋅log(7) ⎦
In [2]: _[0].evalf()
Out[2]: -1.8108123000607 - 1.59457436286436⋅ⅈ
In [3]: nsolve(2*(3*x+4)**5 - 6*7**(3*x+9), x, -1.8 - 1.6j)
Out[3]: (-1.8108123000607 - 1.59457436286436j)
This is due to this strange inconsistency (due to hashing):
In [1]: s = solve(2*(3*x+4)**5 - 6*7**(3*x+9), x)
In [2]: s
Out[2]:
⎡ ⎛ ⎛ 5 ⎽⎽⎽ ⎞⎞⎤
⎢ ⎜ ⎜-7⋅╲╱ 3 ⋅log(7)⎟⎟⎥
⎢-⎜4⋅log(7) + 5⋅LambertW⎜───────────────⎟⎟⎥
⎢ ⎝ ⎝ 5 ⎠⎠⎥
⎢─────────────────────────────────────────⎥
⎣ 3⋅log(7) ⎦
In [3]: sstr(s)
Out[3]: [-(4*log(7) + 5*LambertW(-7*3**(1/5)*log(7)/5))/(3*log(7))]
In [4]: [-(4*log(7) + 5*LambertW(-7*3**(S(1)/5)*log(7)/5))/(3*log(7))]
Out[4]:
⎡ ⎛ 5 ⎽⎽⎽ ⎞ ⎤
⎢ ⎜-7⋅╲╱ 3 ⋅log(7)⎟ ⎥
⎢- 5⋅LambertW⎜───────────────⎟ - 4⋅log(7)⎥
⎢ ⎝ 5 ⎠ ⎥
⎢────────────────────────────────────────⎥
⎣ 3⋅log(7) ⎦
I'm working on a patch.
Vinzent
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