python的字符串截取、拼接

python的字符串截取

str = ‘0123456789’ print str[0:3] #截取第一位到第三位的字符 print str[:] #截取字符串的全部字符 print str[6:] #截取第七个字符到结尾 print str[:-3] #截取从头开始到倒数第三个字符之前 print str[2] #截取第三个字符 print str[-1] #截取倒数第一个字符 print str[::-1] #创造一个与原字符串顺序相反的字符串 print str[-3:-1] #截取倒数第三位与倒数第一位之前的字符 print str[-3:] #截取倒数第三位到结尾 print str[:-5:-3] #逆序截取，具体啥意思没搞明白？ text[3:4] #获取位置3,4，但是不包括位置4，那么只是去位置3上的字符 012 0123456789 6789 0123456 2 9 9876543210 78 789 96

Python 拼接字符串的几种方式

str_name1 = 'To' str_name2 = 'ny' str_name = str_name1 + str_name2 print(str_name)

项目相关

print('hello') print(opt.input_video) input_Name=opt.input_video gang="\\" videoname=input_Name[input_Name.rfind(gang)+1:] print(videoname.find('.')) index=videoname.find('.') print(videoname) video_pre=videoname[0:index] print(video_pre) last=video_pre[-1] print(last) suffix="_det.mp4" frame_suffix="_frame" whole_frame_save=video_pre+frame_suffix whole_Video_Name=video_pre+suffix txt_sufficx="_det.txt" whole_txt_Path=video_pre+txt_sufficx print(whole_Video_Name) print(whole_frame_save) print(whole_txt_Path) if last=="1": txt="H:\listen\calm\calm_txt\\"+whole_txt_Path if last=="2": txt="H:\listen\hurry\hurry_txt\\"+whole_txt_Path print(txt) print('world') if opt.output_format == 'video': if last=="1": result_root2="H:\listen\calm\calm_det_video" if last=="2": result_root2="H:\listen\hurry\hurry_det_video" else: result_root2="H:\Tracking\Towards-Realtime-MOT-master\Towards-Realtime-MOT-master" output_video_path = osp.join(result_root2, whole_Video_Name) cmd_str = 'ffmpeg -f image2 -i {}/%05d.jpg -c:v copy {}'.format(osp.join(result_root, whole_frame_save), output_video_path) os.system(cmd_str) hello H:\listen\calm\calm_video\1_1.mp4 3 1_1.mp4 1_1 1 1_1_det.mp4 1_1_frame 1_1_det.txt H:\listen\calm\calm_txt\1_1_det.txt world