custom - defined listing arguments - online resources raising - exceptionshandling except clause - finally clause - length checking multiple exceptions - nesting - passing error information to caller - raising exceptions - range checking single exception - specific and unknown exceptions - exec(command exemaker library exit(command - expandtabs(function exponents expressions extend(function extending classes - extendleft(function extensible markup language (xml) - extensionsfile * \ escape sequence features fedora core fermilab fieldsdatabase fifo (first in/first out) file storage creating files - deleting files overview - reading files - structure of content - supported file types writing data to files - __file__ attribute filenotfounderror exception fill character finally clause exceptions and overview - find(function first in/first out (fifo) float(function float type floating-point values formatting strings overview - reasons for multiple numeric types flow control see control statements fluid dynamics flushing data folders fonts/tabs tabidle - for loops break statements - continue statements - creating deque type and else clause - nesting - pass clause - for statement using with lists while statement versus format(function - formfeed character forward slash ) freezing applications from import statements - ftpparse library full(function