Python代碼在進入函數時不起作用

Question

我是Python新手，我正在處理一些tar文件。下面的示例工作：

#!/usr/bin/python 
import os, readline, tarfile, scipy.io, numpy as np, sys 
year = 2012; 
month = 12; 
day = 10; 
RS = 9; 
hour = 00; 
minute = 05; 
seconds = 00; 
UTC = 1355094300; 
anArchive = '/Users/user/data/20121210.zip'; 
tar = tarfile.open(anArchive); 
dynamicPath = './%4d%2d%2d/RS%02d/%02d%02d%02d_%10d/all.txt' %(year, month, day, RS, hour,minute, seconds, UTC); 
print(dynamicPath); 
memb = tar.getmember(dynamicPath); 
file = tar.extractfile(memb.name); 
print('loading file with measurements...\n'); 
contents = file.read(); 
destinationFile = open("extractedFile.txt", "w"); 
destinationFile.write(contents); 

從一個tar獲取文件，提取它，並在新文件中寫入它。

現在我想定義不完全一樣的事情的函數：

#!/usr/bin/python 
import os, readline, tarfile, scipy.io, numpy as np, sys 
def extractFile(): 
    year = 2012; 
    month = 12; 
    day = 10; 
    RS = 9; 
    hour = 00; 
    minute = 05; 
    seconds = 00; 
    UTC = 1355094300; 
    anArchive = "/Users/user/data/20121210.zip"; 
    tar = tarfile.open(anArchive); 
    dynamicPath = "./%4d%2d%2d/LOSS_RS%02d/%02d%02d%02d_%10d/all.txt" %(year, month, day, RS, hour,minute, seconds, UTC); 
    print(dynamicPath); 
    #memb = tar.getmember("./20121210/RS09/004501_1355096701/all.txt"); 
    memb = tar.getmember(dynamicPath); 
    file = tar.extractfile(memb.name); 
    print('loading file with measurements...\n'); 
    contents = file.read(); 
    destinationFile = open("extractedFile.txt", "w"); 
    destinationFile.write(contents); 
    return 

後，我將它保存，並確保是可執行的，我從終端檢查執行它也縮進錯誤：

python -t extractFile.py 

並且結果是什麼都沒有。沒有錯誤，執行「結束」但沒有結果，就像我執行空代碼一樣。

任何想法，爲什麼當作爲一個函數使用相同的確切代碼不起作用？

Answer 1

你需要調用該函數要執行它 - 這行添加到文件的末尾：

extractFile() 

即整個代碼應該是：

#!/usr/bin/python 
import os, readline, tarfile, scipy.io, numpy as np, sys 
def extractFile(): 
    year = 2012; 
    month = 12; 
    day = 10; 
    RS = 9; 
    hour = 00; 
    minute = 05; 
    seconds = 00; 
    UTC = 1355094300; 
    anArchive = "/Users/user/data/20121210.zip"; 
    tar = tarfile.open(anArchive); 
    dynamicPath = "./%4d%2d%2d/LOSS_RS%02d/%02d%02d%02d_%10d/all.txt" %(year, month, day, RS, hour,minute, seconds, UTC); 
    print(dynamicPath); 
    #memb = tar.getmember("./20121210/RS09/004501_1355096701/all.txt"); 
    memb = tar.getmember(dynamicPath); 
    file = tar.extractfile(memb.name); 
    print('loading file with measurements...\n'); 
    contents = file.read(); 
    destinationFile = open("extractedFile.txt", "w"); 
    destinationFile.write(contents); 
    return 
extractFile()