Simplify code by dropping support for legacy Python (#1143)

* Simplify code by dropping support for legacy Python

* sort() --> sorted()

maths/simpson_rule.py

@@ -8,9 +8,6 @@ method 2:
 "Simpson Rule"
 
 """
-from __future__ import print_function
-
-
 def method_2(boundary, steps):
 # "Simpson Rule"
 # int(f) = delta_x/2 * (b-a)/3*(f1 + 4f2 + 2f_3 + ... + fn)

maths/trapezoidal_rule.py

@@ -7,8 +7,6 @@ method 1:
 "extended trapezoidal rule"
 
 """
-from __future__ import print_function
-
 def method_1(boundary, steps):
 # "extended trapezoidal rule"
 # int(f) = dx/2 * (f1 + 2f2 + ... + fn)
@@ -19,7 +17,7 @@ def method_1(boundary, steps):
 	y = 0.0
 	y += (h/2.0)*f(a)
 	for i in x_i:
-		#print(i)	
+		#print(i)
 		y += h*f(i)
 	y += (h/2.0)*f(b)
 	return y

maths/zellers_congruence.py

@@ -1,4 +1,3 @@
-from __future__ import annotations
 import datetime
 import argparse
 
@@ -7,7 +6,7 @@ def zeller(date_input: str) -> str:
 
     """
     Zellers Congruence Algorithm
-    Find the day of the week for nearly any Gregorian or Julian calendar date 
+    Find the day of the week for nearly any Gregorian or Julian calendar date
 
     >>> zeller('01-31-2010')
     'Your date 01-31-2010, is a Sunday!'
@@ -108,7 +107,7 @@ def zeller(date_input: str) -> str:
     # Validate
     if not 0 < d < 32:
         raise ValueError("Date must be between 1 - 31")
-    
+
     # Get second seperator
     sep_2: str = date_input[5]
     # Validate