Remove extra imports in gamma.py doctests (#8060)

* Refactor bottom-up function to be class method

* Add type hints

* Update convolve function namespace

* Remove depreciated np.float

* updating DIRECTORY.md

* updating DIRECTORY.md

* updating DIRECTORY.md

* updating DIRECTORY.md

* Renamed function for consistency

* updating DIRECTORY.md

* Remove extra imports in gamma.py doctests

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Chris O <[email protected]>

Author: 3 people

Diff for: maths/gamma.py

@@ -11,42 +11,27 @@ def gamma(num: float) -> float:
     used extension of the factorial function to complex numbers.
     The gamma function is defined for all complex numbers except the non-positive
     integers
-
-
     >>> gamma(-1)
     Traceback (most recent call last):
         ...
     ValueError: math domain error
-
-
-
     >>> gamma(0)
     Traceback (most recent call last):
         ...
     ValueError: math domain error
-
-
     >>> gamma(9)
     40320.0
-
     >>> from math import gamma as math_gamma
     >>> all(.99999999 < gamma(i) / math_gamma(i) <= 1.000000001
     ...     for i in range(1, 50))
     True
-
-
-    >>> from math import gamma as math_gamma
     >>> gamma(-1)/math_gamma(-1) <= 1.000000001
     Traceback (most recent call last):
         ...
     ValueError: math domain error
-
-
-    >>> from math import gamma as math_gamma
     >>> gamma(3.3) - math_gamma(3.3) <= 0.00000001
     True
     """
-
     if num <= 0:
         raise ValueError("math domain error")