('my project'.upper()) #MY PROJECT 54 print('my project'.lower()) #my project 55 print('My project'.swapcase()) #mY PROJECT 56 print('my project'.ljust(50,"-")) #my project---------------------------------------- 57 print('my project'.rjust(50,'-')) #----------------------------------------my project 58 #去掉字符串空格与换行符 59 print(" my project\n".strip()) #my project 60 print('test') 61 #替换 62 print("my project project".replace('pro','test',1)) #my testject project 63 #从右向左查找 64 print("my project project".rfind('t')) #17 65 #以右为准分开 66 print("my project project".rsplit('j',1)) #['my project pro', 'ect'] 67 print("my project project".title()) #My Project Project