variables and expression unit structure objectives introduction values and types variables variable names and keywords type conversion implicit type conversion explicit type conversion operators and operands expressions interactive mode and script mode order of operations summary references unit end exercise objectives after reading through this you will be able to to understand and use the basic datatypes of python to understand the type conversion of variables in python programming to understand the operators and operands in python to understand the interactive mode and script mode in python to understand the order of operations in python introduction variables in computer program are not quite like mathematical variables they are placeholders for locations in memory memory values consists of sequence of binary digits (bitsthat can be or so all numbers are represented internally in base names of variables are chosen by the programmer