added two basic python programs.

beginner_python/11-simple calculator

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+# Program make a simple calculator
+
+# This function adds two numbers 
+def add(x, y):
+   return x + y
+
+# This function subtracts two numbers 
+def subtract(x, y):
+   return x - y
+
+# This function multiplies two numbers
+def multiply(x, y):
+   return x * y
+
+# This function divides two numbers
+def divide(x, y):
+   return x / y
+
+print("Select operation.")
+print("1.Add")
+print("2.Subtract")
+print("3.Multiply")
+print("4.Divide")
+
+# Take input from the user 
+choice = input("Enter choice(1/2/3/4): ")
+
+num1 = float(input("Enter first number: "))
+num2 = float(input("Enter second number: "))
+
+if choice == '1':
+   print(num1,"+",num2,"=", add(num1,num2))
+
+elif choice == '2':
+   print(num1,"-",num2,"=", subtract(num1,num2))
+
+elif choice == '3':
+   print(num1,"*",num2,"=", multiply(num1,num2))
+
+elif choice == '4':
+   print(num1,"/",num2,"=", divide(num1,num2))
+else:
+   print("Invalid input")

beginner_python/12 unit convertor

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+import math
+import time
+"""Unit Converter"""
+#Welcome and variable setting
+print ("Welcome to Sam's Unit Converter")
+cat = input("Which category would you like to convert? we support length(l) and Weight(w):  ")
+if cat == ("l"):
+    unit1 = input ("Which unit would you like to convert from: ")
+    unit2 = input ("Which unit would you like to convert to: ")
+    num1 = input ("Enter your value: " )
+
+    ##Calculations  
+
+if unit1 == "cm" and unit2 == "m":
+    ans = float(num1)/100       
+elif unit1 == "mm" and unit2 == "cm":
+    ans = float(num1)/10
+elif unit1 == "m" and unit2 == "cm":
+    ans = float(num1)*100
+elif unit1 == "cm" and unit2 == "mm":
+    ans = float(num1)*10
+elif unit1 == "mm" and unit2 == "m":
+    ans = float(num1)/1000
+elif unit1 == "m" and unit2 == "mm":
+    ans = float(num1)*1000  
+elif unit1 == "km" and unit2 == "m":
+    ans = float(num1)*1000
+elif unit1 == "m" and unit2 == "km":
+    ans = float(num1)/1000
+elif unit1 == "mm" and unit2 == "km":
+    ans = float(num1)/1000000

simple calculator

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+# Program make a simple calculator
+
+# This function adds two numbers 
+def add(x, y):
+   return x + y
+
+# This function subtracts two numbers 
+def subtract(x, y):
+   return x - y
+
+# This function multiplies two numbers
+def multiply(x, y):
+   return x * y
+
+# This function divides two numbers
+def divide(x, y):
+   return x / y
+
+print("Select operation.")
+print("1.Add")
+print("2.Subtract")
+print("3.Multiply")
+print("4.Divide")
+
+# Take input from the user 
+choice = input("Enter choice(1/2/3/4): ")
+
+num1 = float(input("Enter first number: "))
+num2 = float(input("Enter second number: "))
+
+if choice == '1':
+   print(num1,"+",num2,"=", add(num1,num2))
+
+elif choice == '2':
+   print(num1,"-",num2,"=", subtract(num1,num2))
+
+elif choice == '3':
+   print(num1,"*",num2,"=", multiply(num1,num2))
+
+elif choice == '4':
+   print(num1,"/",num2,"=", divide(num1,num2))
+else:
+   print("Invalid input")