2019獨角獸企業重金招聘Python工程師標準>>>

Remember your checklist for functions, then do this exercise paying close?attention to how functions and files can work together to make useful stuff.

#!/usr/bin/env?python #?-*-?coding:?utf-8?-*-from?sys?import?argv script?,?input_file?=?argv def?print_all(f):print?f.read()def?rewind(f):f.seek(0)def?print_a_line(line_count,?f):print?line_count,?f.readline()current_file?=?open?(input_file)print?"First?let's?print?the?whole?file:\n" print_all?(current_file?)print?"Now?let's?rewind,?kind?of?like?a?tape." rewind?(current_file?)print?"Let's?print?three?lines:" current_line?=?1 print_a_line?(current_line?,?current_file?) current_line?=?current_line?+?1 print_a_line?(current_line?,?current_file?) current_line?=?current_line?+?1 print_a_line?(current_line?,?current_file?)

result：

? ? ? ? ? ? ? ? ? ? ? ? ??

Pay close attention to how we pass in the current line number each time we?run print_a_line.

轉載于:https://my.oschina.net/xtfjt1988/blog/401937

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