directory howeverthis directory doesn' actually contain any source code files to locate the source code filesyou must open one of the directories contained in the bp directory first to locate the source code files for this you look in the bp ddirectory notice that 've used backslash (\to separate the directory levels some platforms use the forward slash (/)while others use the backslash you can read about this issue on my blog at com//backslash-versus-forward-slashthe book uses backslashes when appropriate and assumes that you'll make any required changes for your platform final consideration for python developers (at least for this bookis that the hierarchy of directories is called path you see the term path in few places in this book because python must be able to find any resources you want to use based on the path you provide for examplec:bp dis the complete path to the source code for this on windows system path that traces the entire route that python must search is called an absolute path an incomplete path that traces the route to resource using the current directory as starting point is called relative path creating content for permanent storage file can contain structured or unstructured data an example of structured data is database in which each record has specific information in it an employee database would include columns for nameaddressemployee idand so on each record would be an individual employee and each employee record would contain the nameaddressand employee id fields an example of unstructured data is word processing file whose text can contain any content in any order there is no required order for the content of paragraphand sentences can contain any number of words howeverin both casesthe application must know how to perform crud operations with the file this means that the content must be prepared in such manner that the application can both write to and read from the file even with word processing filesthe text must follow certain series of rules assume for moment that the files are simple text even soevery paragraph must have some sort of delimiter telling the application to begin new paragraph the application reads the paragraph until it sees this delimiterand then it begins new paragraph the more that the word processor offers in the way of featuresthe more structured the output becomes for examplewhen the word processor offers method of formatting the textthe formatting must appear as part of the output file