>>>>> import cmath
>>>>> cmath.atan(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'cmath' has no attribute 'atan'
>>>>> cmath.atanh(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'cmath' has no attribute 'atanh'

>>>>> import cmath
>>>>> cmath.atan(2)
(1.1071487177940904+0j)
>>>>> cmath.atanh(2)
(0.5493061443340549-1.5707963267948966j)