EOL error in Sage-9.1

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I want to modify a Python package for solving 'Quasi normal modes' using SageMath if possible, I want the below error to be fixed.

?qnm.modes_cache

grav_220 = qnm.modes_cache(s=-2, l=2, m=2, n=0)
omega, A, C = grav_220(a=0.68)
print('ω={}, A={}'.format(omega, A))
print('C={}''.format(C))

I get the error for the second input as

File "<ipython-input-13-1f77b2f8a4ef>", line 4
print('C={}''.format(C))
                        ^
SyntaxError: EOL while scanning string literal