Python代码在进入函数时不起作用

Question

我是Python新手，我正在处理一些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); 

从一个tar获取文件，提取它，并在新文件中写入它。

现在我想定义不完全一样的事情的函数：

#!/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 

后，我将它保存，并确保是可执行的，我从终端检查执行它也缩进错误：

python -t extractFile.py 

并且结果是什么都没有。没有错误，执行“结束”但没有结果，就像我执行空代码一样。

任何想法，为什么当作为一个函数使用相同的确切代码不起作用？

Answer 1

你需要调用该函数要执行它 - 这行添加到文件的末尾：

extractFile() 

即整个代码应该是：

#!/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()