the first few steps variable (the word float is just computer language for real numberin any casepython thinks of as an objectof type int or float another common type of variable is stri stringneeded when you want to store text when python interprets "this is string"it stores the text (in between the quotesin the variable this variable is then an object of type str you may convert between variable types if it makes sense ife is an int objectwriting float(xwill make floating point representation of similarlyyou may write int(xto produce an int if is originally of type float type conversion may also occur automaticallyas shown just below names of variables should be chosen so that they are descriptive when computing mathematical quantity that has some standard symbole ,this should be reflected in the name by letting the word alpha be part of the name for the corresponding variable in the program if youe have variable for counting the number of sheepthen one appropriate name could be no_of_sheep such naming makes it much easier for human to understand the written code variable names may also contain any digit from to or underscoresbut can not start with digit letters may be lower or upper casewhich to python is different note that certain names in python are reservedmeaning that you can not use these as names for variables some examples are forwhileifelseglobalreturn and elif if you accidentally use reserved word as variable name you get an error message we have seen thate will assign the value to the variable but how do we write it if we want to increase by we may write an assignment like or (giving faster computationx + now python interprets this astake whatever value that is in xadd and let the result become the new value of in other wordsthe old value of is used on the right hand side of =no matter how messy the expression might beand the result becomes the new value of in similar wayx - reduces the value of by * multiplies by and / divides by updating the value of accordingly what if an object of type intand we add floatthen automatic type conversion takes placeand the new will have the value an object of type float as seen herein [ ] in [ ] in [ ] out [ ] note that python programmersand python (in printouts)often writee which by definition is the integer represented as float integer division another issue that is important to be aware of is integer division let us look at small exampleassuming we want to divide one by four