>> V2 = 5*D*(9*D**4*exp(2*r2/D) - 9*D**4 + 9*D**3*r1*exp(2*r2/D) - 9*D**3* &
>> r1 - 9*D**3*r2*exp(2*r2/D) - 9*D**3*r2 + 3*D**2*r1**2*exp(2*r2/D &
>> ) - 3*D**2*r1**2 - 9*D**2*r1*r2*exp(2*r2/D) - 9*D**2*r1*r2 + 3*D &
>> **2*r2**2*exp(2*r2/D) - 3*D**2*r2**2 - 3*D*r1**2*r2*exp(2*r2/D) - &
>> 3*D*r1**2*r2 + 3*D*r1*r2**2*exp(2*r2/D) - 3*D*r1*r2**2 + r1**2*r2 &
>> **2*exp(2*r2/D) - r1**2*r2**2)*exp(-r1/D - r2/D)/(2*r1**3*r2**3)
It would be much nicer for the reader if textwrap's fill were used for this:
>>> import textwrap
>>> text = lambda x: textwrap.TextWrapper(
... width=60,
... break_long_words=False
... ).fill(str(x))
>>>
>>> V2 = S('5*D*(9*D**4*exp(2*r2/D) - 9*D**4 + 9*D**3*r1*exp(2*r2/D) - 9*D**3*r1
- 9*D**3*r2*exp(2*r2/D) - 9*D**3*r2 + 3*D**2*r1**2*exp(2*r2/D) - 3*D**2*r1**2 -
9*D**2*r1*r2*exp(2*r2/D) - 9*D**2*r1*r2 + 3*D**2*r2**2*exp(2*r2/D) - 3*D**2*r2*
*2 - 3*D*r1**2*r2*exp(2*r2/D) -3*D*r1**2*r2 + 3*D*r1*r2**2*exp(2*r2/D) - 3*D*r1*
r2**2 + r1**2*r2**2*exp(2*r2/D) - r1**2*r2**2)*exp(-r1/D - r2/D)/(2*r1**3*r2**3)
')
>>> print text(V2)
5*D*(9*D**4*exp(2*r2/D) - 9*D**4 + 9*D**3*r1*exp(2*r2/D) -
9*D**3*r1 - 9*D**3*r2*exp(2*r2/D) - 9*D**3*r2 +
3*D**2*r1**2*exp(2*r2/D) - 3*D**2*r1**2 -
9*D**2*r1*r2*exp(2*r2/D) - 9*D**2*r1*r2 +
3*D**2*r2**2*exp(2*r2/D) - 3*D**2*r2**2 -
3*D*r1**2*r2*exp(2*r2/D) - 3*D*r1**2*r2 +
3*D*r1*r2**2*exp(2*r2/D) - 3*D*r1*r2**2 +
r1**2*r2**2*exp(2*r2/D) - r1**2*r2**2)*exp(-r1/D -
r2/D)/(2*r1**3*r2**3)
FWIW...
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