python runtime services path list of strings specifying the search path for modules the first entry is always set to the directory in which the script used to start python is located (if availablerefer to "iterators and generators platform platform identifier stringsuch as 'linux- prefix directory where platform-independent python files are installed ps ps strings containing the text for the primary and secondary prompts of the interpreter initiallyps is set to and ps is set to the str(method of whatever object is assigned to these values is evaluated to generate the prompt text py kwarning flag set to true in python when the interpreter is run with the - option stdinstdoutstderr file objects corresponding to standard inputstandard outputand standard error stdin is used for the raw_input(and input(functions stdout is used for print and the prompts of raw_input(and input(stderr is used for the interpreter' prompts and error messages these variables can be assigned to any object that supports write(method operating on single string argument _stdin_ __ _stdout_ __ _stderr_ file objects containing the values of stdinstdoutand stderr at the start of the interpreter tracebacklimit maximum number of levels of traceback information printed when an unhandled exception occurs the default value is value of suppresses all traceback information and causes only the exception type and value to be printed version version string version_info version information represented as tuple (majorminormicroreleaselevelserialall values are integers except releaselevelwhich is the string 'alpha''beta''candidate'or 'finalwarnoptions list of warning options supplied to the interpreter with the - command-line option winver the version number used to form registry keys on windows lib fl ff