added method overloading in python documentation

Examples/method_overloading.py

@@ -0,0 +1,29 @@
+""" 
+Method Overloading allows different methods to have the same name,
+but different signatures where the signature can differ by the number of
+input parameters or type of input parameters, or a mixture of both. 
+Method overloading is also known as Compile-time Polymorphism, Static Polymorphism, or Early binding in Java.
+In Method overloading compared to parent argument, child argument will get the highest priority. 
+Below is an example which demonstrates method overloading
+"""
+
+
+# First product method.
+# Takes two argument and print their
+# product
+def product(a, b):
+	p = a * b
+	print(p)
+
+# Second product method
+# Takes three argument and print their
+# product
+def product(a, b, c):
+	p = a * b*c
+	print(p)
+
+# Uncommenting the below line shows an error	
+# product(4, 5)
+
+# This line will call the second product method
+product(4, 5, 5)

Examples/sample_oo_dashboard/requirements_dashboard.txt

@@ -13,10 +13,10 @@ Faker==0.8.18
 flake8==3.7.8
 Flask==1.1.1
 Flask-Compress==1.4.0
-future==0.17.1
+future==0.18.3
 inflection==0.3.1
 itsdangerous==1.1.0
-Jinja2==2.10.1
+Jinja2==2.11.3
 lazy-object-proxy==1.4.2
 MarkupSafe==1.1.1
 mccabe==0.6.1
@@ -27,7 +27,7 @@ plotly==4.1.1
 pyaml==16.12.2
 pycodestyle==2.5.0
 pyflakes==2.1.1
-Pygments==2.4.2
+Pygments==2.7.4
 pylev==1.3.0
 python-dateutil==2.8.0
 pytz==2019.2