Added functions in python

Author: ChucklesDroid

functions/function.py

@@ -0,0 +1,22 @@
+#  function :- is a block of code that is executed when it is called 
+#  We make use of 'def' to define a function
+
+#  Function Declaration
+def hello():
+    print("Hello")
+
+hello()
+
+#  Function with parameters( also shows function overloading )
+def hello( name ):
+    print("Hello " + name)
+
+hello("aakarsh")
+
+#  Function having varied argument list
+def hello( first_name, last_name, age ):
+    print("Hello "+ first_name+ " "+ last_name)
+    print("You are "+ str(age)+ " years old!")
+
+hello("aakarsh", "mj", 21)
+

functions/positionalargs.py

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+#  positional args :-  order of arguments matter 
+#  keyword args :- arguments preceded by an identifier( which are names of variables
+#  in the argument list) when we pass them to function order of arguments do not 
+#  matter,unlike positional arguments python knows the name of arguments which 
+#  it recievers
+
+def hello( first_name, middle_name, last_name ):
+    print("Hello " + first_name+ " "+ middle_name+ " "+ last_name)
+
+hello( "aakarsh", "m", "j" )    #positional arguments
+hello( middle_name="m", last_name="j", first_name="aakarsh" ) #keyword arguments 
+

functions/return.py

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+#  return statement returns a value to the caller
+
+#  Eg - Use with functions
+def multiply(operand1, operand2):
+    return operand1*operand2
+
+print(multiply(6,8)) #You can store the value in a variable or print it on screen
+product = multiply(10,5)
+print(product)