python如何定位到文本指定行？

1.默認你知道“指定行”的行號 那么：

def appoint_line(num,file): with open(file,"r",encoding='utf-8') as f: out = f.readlines[num-1] return out print(appoint_line(2,"c:/text.txt")) 以上示例為讀取c盤下的text.txt文件的第二行 2.假如所謂“指定行”為開頭幾個字符，這里假設為三個 def appoint_line(file): # appoimt_spring是指你指定行的前三個字符,你可以自行指定 appoint_spring = input(">>").strip() with open(file,"r",encoding='utf-8') as f: for line in f.readlines(): if line[0:3] == appoint_spring: return line print(appoint_line("c:/text.txt")) 以上示例為根據你輸入的所指定行的前三個字符打印出c盤下的text.txt文件下的“指定行”