Python中os.path的变量

Question

我刚开始学习Python，想写一个程序，创建一个以今天日期命名的文件夹，然后在这个文件夹里创建一个“沙盒”，最后在这个沙盒里运行一个make文件。不过，我在使用os.path的地方遇到了一些问题，变量没有被正确识别。下面是我的代码：

#!/usr/bin/python  
import mks_function  
from mks_function import mks_create_sandbox  
import sys, os, time, datetime  
import os.path  

today = datetime.date.today()  # get today's date as a datetime type  

todaystr = today.isoformat()   # get string representation: YYYY-MM-DD  
                           # from a datetime type.  

if not os.path.exists('/home/build/test/sandboxes/'+todaystr):  
 os.mkdir(todaystr)  
else:  
 pass  

if not os.path.exists('/home/build/test/sandboxes/'+todaystr+'/new_sandbox/project.pj'):  
 mks_create_sandbox()  
else:  
 pass  

if os.path.exists('/home/build/test/sandboxes/'+todaystr+'/new_sandbox/Makefile'):  
 os.system("make >make_results.txt 2>&1")  

如果能帮忙解决这个问题，我会非常感激，感谢！

Answer 1

请在调用make之前，试着添加chdir的代码。

if os.path.exists('/home/build/test/sandboxes/'+todaystr+'/new_sandbox/Makefile'):
 os.chdir('/home/build/test/sandboxes/'+todaystr+'/new_sandbox/')
 os.system("make >make_results.txt 2>&1")

Answer 2

我觉得你想要改一些东西：

def makeSandbox():
  sbdir = os.path.join('/home/build/test/sandboxes/',todaystr)
  if not os.path.exists(sbdir):  
    os.mkdir(sbdir)  # <- fully qualified path
  else:  
    pass

而且我并不太明白需要用到哪些变量，对我来说看起来没问题。

Answer 3

几点说明：

#!/usr/bin/env python  
# import mks_function .. you won't need this ...

from mks_function import mks_create_sandbox  
import os, datetime  

# import time, sys .. these aren't used in this snippet 
# import os.path .. just refer to os.path, since os is already imported

# get today's date as a datetime type  
todaystr = datetime.date.today().isoformat()  

# .. use os.path.join()
if not os.path.exists(os.path.join('/home/build/test/sandboxes/', todaystr)):  
    os.mkdir(os.path.join('/home/build/test/sandboxes/', todaystr))  
# .. 'else: pass' is unnecessary

if not os.path.exists(os.path.join(
    '/home/build/test/sandboxes/', todaystr, '/new_sandbox/project.pj')):  

    # i'm not seen, that the sandbox is created in the right directory here
    # maybe you should change the working directory via ..
    # os.chdir(os.path.join('/home/build/test/sandboxes/', todaystr))
    mks_create_sandbox()  

if os.path.exists(os.path.join(
    '/home/build/test/sandboxes/', todaystr, '/new_sandbox/Makefile')):  

    # .. change to the right directory
    os.chdir(os.path.join(
        '/home/build/test/sandboxes/', todaystr, '/new_sandbox/'))

    os.system("make > make_results.txt 2>&1")