閱讀文本文件最後一行的方式是否正確？ python

Question

我試圖讀取文本文件的最後一行，所以我想出了這個 它不正確？

import time 
Data = open("Data.txt") 
lines = len(Data.readlines()) 
Data.close() 

print lines 

Data = open("Data.txt") 

for x in range(0, lines): 
    lastline = Data.readline() 
# print lastline 


print lastline 

Answer 1

我從句法上看不出代碼有什麼問題，但它可以做得簡單得多。使用with是建議的打開文件的方式，它可以確保在代碼退出with的範圍後正確關閉文件，從而簡化代碼。

with open("Data.txt") as f: 
    # readlines returns a list of lines in the file 
    # since it is a list all you need do is access the last element in the list 
    # that element should be the last line in your text file. 
    last_line = f.readlines()[-1] 

    print last_line