Improved Formatting and Style of Math Algos (#960)

* Improved Formatting and Style

I improved formatting and style to make PyLama happier.

Linters used:

- mccabe
- pep257
- pydocstyle
- pep8
- pycodestyle
- pyflakes
- pylint
- isort

* Create volume.py

This script calculates the volumes of various shapes.

* Delete lucasSeries.py

* Revert "Delete lucasSeries.py"

This reverts commit 64c19f7a6c.

* Update lucasSeries.py

maths/abs.py

@@ -1,24 +1,25 @@
 """Absolute Value."""
 
 
-def absVal(num):
+def abs_val(num):
     """
     Find the absolute value of a number.
 
-    >>absVal(-5)
+    >>abs_val(-5)
     5
-    >>absVal(0)
+    >>abs_val(0)
     0
     """
     if num < 0:
         return -num
-    else:
-        return num
+
+    # Returns if number is not < 0
+    return num
 
 
 def main():
     """Print absolute value of -34."""
-    print(absVal(-34))  # = 34
+    print(abs_val(-34))  # = 34
 
 
 if __name__ == '__main__':