python基础

1.打印hello world

#coding:gbkdef main():print("hello world")if __name__ == '__main__':main()

2.计算从1到100的和

#coding:gbkdef calc(n):total = 0for i in range(n):total += ireturn totaldef calc_1(n):total = 0i = 0while i <= 100:total += i;i += 1return totaldef calc_2(n):total = 0for i in xrange(0, n):total += ireturn totalif __name__ == '__main__':total = calc(100)print(total)total1 = calc_1(100)print(total)total2 = calc_2(100)print(total)

3.读写文件操作

#coding:gbkdef file_cat(f_name):fd = open(f_name, "rb+")for l in fd.readlines():print(l)fd.close()def file_cat_1(f_name):fd = open(f_name, "rb+")buf = fd.read();if buf != None and len(buf) > 0:print(buf)fd.close()def file_wite(f_name):fd = open(f_name, "wb+")fd.write("hello world\n")fd.write("heihei")fd.close()if __name__ == '__main__':f_name = "tmp"file_wite(f_name)file_cat(f_name)file_cat_1(f_name)

4.调用shell脚本

#coding:gbkimport osimport commandsdef do_cmd(cmd_str):return os.system(cmd_str)def do_cmd_1(cmd_str):return os.popen(cmd_str).read()def do_cmd_2(cmd_str):return commands.getstatusoutput(cmd_str)if __name__ == '__main__':ret = do_cmd("ls -l")res = do_cmd_1("ls -l")ret, res = do_cmd_2("ls -l")print(ret)print(res)print("ret = %d, res = %s"%(ret, res))

5.线程操作

#coding:gbkimport threadingclass MyThread(threading.Thread):"""docstring for MyThread"""def __init__(self, i, n):threading.Thread.__init__(self)self.index = iself.n = ndef run(self):total = 0for i in xrange(1, self.n):total += iprint("%d thread calc %d from 1 total is %d\n"%(self.index, self.n, total))if __name__ == '__main__':n = 10init_n = 100ths = []for x in xrange(1, n):th = MyThread(x, init_n)init_n += 500ths.append(th)for th in ths:th.start()for th in ths:th.join()

6.其它基础操作

<pre name="code" class="python">#coding:gbkdef map_process():maps = {"1":"bb", "2":"cc", "3":"dd"}maps["4"] = "44"for k in maps.keys():print("key:%s, value:%s"%(k, maps[k]))def vec_process():vec = ["a", "b", "c", "d"]vec.append("e")vec.append("f")vec.remove("b")for str in vec:print(str)def str_process():str_test = "hello world"print("str:%s, len:%d"%(str_test, len(str_test)))str_test = "123"n = int(str_test)n += 1print("str_test:%s, n:%d, str(n):%s"%(str_test, n, str(n)))if __name__ == '__main__':map_process()print("++++++++++++++++++++++++++++")vec_process()print("++++++++++++++++++++++++++++")str_process()

7.正则表达式操作

#coding:gbkimport redef regex_match(regex_str, pat_str):return re.match(regex_str, pat_str) != Nonedef regex_search(regex_str, pat_str):return re.search(regex_str, pat_str)def regex_search_all(regex_str, pat_str):return re.findall(regex_str, pat_str)def regex_test():regex_str = r"ab+"regex_search_str = r"bc"pat_str = "abbcbbc"res = regex_match(regex_str, pat_str)print("res = %d"%res)res_obj = regex_search(regex_search_str, pat_str)if res_obj != None:print("search %s"%(res_obj.group()))else:print("can not search")res_obj = regex_search_all(regex_search_str, pat_str)if res_obj != None:print "search ",res_objelse:print("can not search")if __name__ == '__main__':regex_test()