Python從URL錯誤下載？

Question

任何人都可以看到一個問題，此代碼，因爲它正在添加保持背部有一個錯誤，這是代碼和生病後的代碼下的錯誤...感謝先進的幫助...

import commands 
import os 
import pickle 

def readDir(): 
    directory = raw_input('In which folder would you like to save the files?? \n') 
    if(os.path.exists(directory)): 
      print 'Error!! Please give an other name ' 
      directory = raw_input('In which folder would you like to save the file??\n') 
      os.mkdir(directory) 
      os.chdir(directory) 
    else: 
     os.mkdir(directory) 
     os.chdir(directory) 


readDir() 
url = raw_input('Which url are you aiming at ?\n') 
tmp = open('tempo.txt','w'); 
tmp.writelines(url) 
tmp.close() 
tmp = open('tempo.txt','r'); 
link = tmp.read() 
os.system(" curl " + link +"| egrep -o 'http:.*All\.ram' > final.txt ") 



infile = open('final.txt', 'r') 
outfile = open('tmp.txt', 'w') 



for line in infile: 

outfile = open('tmp.txt', 'w') 
key = line 
list = key.split("/") 
dir = list[6] 
outfile.writelines(key) 
outfile.close() 
open('tmp.txt','r') 
os.system("cat tmp.txt | xargs -n1 -i curl {} > links") 
os.system("wget -P %s -i links" %dir) 

infile.close() 
outfile.close() 
os.remove(outfile.name) 
os.remove('links') 
os.remove(tmp.name) 

錯誤：我只是用谷歌作爲例子。

Which url are you aiming at ? 
google.com 
'curl' is not recognized as an internal or external command, operable program or batch file. 
Traceback (most recent call last): 
File "C:\Users\User\Desktop\download.py", line 52, in <module> 
infile = open('final.txt', 'r') 
IOError: [Errno 2] No such file or directory: 'final.txt' 

Answer 1

的問題，我看到：

1. 捲曲似乎並沒有被你的本地計算機上安裝。不知道爲什麼你想要一個系統調用，只抓取一個URL ......
2. 因爲你沒有捲曲安裝，所以沒有創建任何final.txt。當您嘗試在系統中稍後加載它時，它不起作用。

底線，找到一種方法來做到這一點，而不使用捲曲，你會更好。

os.system(" curl " + link +"| egrep -o 'http:.*All\.ram' > final.txt ") 

更仔細地看，它看起來像你只是想下載文件。直接用urllib做這件事更容易。我將複製python docs中的一個簡單示例，並讓您從中找出如何使用它。注意，還有如何，如果你正在使用Python 2或3做這個大的差異，所以只是被警告...

>>> import urllib 
>>> params = urllib.urlencode({'spam': 1, 'eggs': 2, 'bacon': 0}) 
>>> f = urllib.urlopen("http://www.musi-cal.com/cgi-bin/query?%s" % params) 
>>> print f.read()