[ , , , , , , , , list(set( )after thisl will equal [ , , , , examplewordplay here is an example of an if statement that uses set to see if every letter in word is either an abcdor eif set(wordcontainedin'abcde ') unicode it used to be computers could only display different characterscalled ascii characters in this systemcharacters are allotted one byte of memory eachwhich gives possible characterseach with corresponding numerical value characters through include various control charactersincluding '\nand '\tafter that came some special symbolsthen numberscapital letterslowercase lettersand few more symbols beyond that are variety of other symbolsincluding some international characters however characters is not nearly enough to represent all of the symbols used throughout the alphabets of the world the new standard is unicodewhich uses more than one byte to store character data unicode currently supports over , characters "standardisn' quite the right word hereas there are actually several standards in useand this can cause some trouble if you need to work with unicode datado some research into it first to learn about all the craziness in unicodecharacters still have numerical equivalents if you would like to go back and forth between character and its numerical equivalentuse the chr and ord built-in functions for exampleuse ord(' 'to get the numerical value of ' 'and use chr( to get the character with numerical value here is short example that prints out the first unicode characters print'join([chr(ifor in range( )])python supports unicodeboth in strings and in the names of variablesfunctionsetc there are some differences between python and python in support for unicode