Added decimal_isolate.py (#3700)

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Co-authored-by: NChristian Clauss <cclauss@me.com>

* Update decimal_isolate.py

* Update decimal_isolate.py

* Update decimal_isolate.py

* Update decimal_isolate.py
Co-authored-by: NChristian Clauss <cclauss@me.com>

maths/decimal_isolate.py

+"""
+Isolate the Decimal part of a Number
+https://stackoverflow.com/questions/3886402/how-to-get-numbers-after-decimal-point
+"""
+
+
+def decimal_isolate(number, digitAmount):
+
+    """
+    Isolates the decimal part of a number.
+    If digitAmount > 0 round to that decimal place, else print the entire decimal.
+    >>> decimal_isolate(1.53, 0)
+    0.53
+    >>> decimal_isolate(35.345, 1)
+    0.3
+    >>> decimal_isolate(35.345, 2)
+    0.34
+    >>> decimal_isolate(35.345, 3)
+    0.345
+    >>> decimal_isolate(-14.789, 3)
+    -0.789
+    >>> decimal_isolate(0, 2)
+    0
+    >>> decimal_isolate(-14.123, 1)
+    -0.1
+    >>> decimal_isolate(-14.123, 2)
+    -0.12
+    >>> decimal_isolate(-14.123, 3)
+    -0.123
+    """
+    if digitAmount > 0:
+        return round(number - int(number), digitAmount)
+    return number - int(number)
+
+
+if __name__ == "__main__":
+    print(decimal_isolate(1.53, 0))
+    print(decimal_isolate(35.345, 1))
+    print(decimal_isolate(35.345, 2))
+    print(decimal_isolate(35.345, 3))
+    print(decimal_isolate(-14.789, 3))
+    print(decimal_isolate(0, 2))
+    print(decimal_isolate(-14.123, 1))
+    print(decimal_isolate(-14.123, 2))
+    print(decimal_isolate(-14.123, 3))