python-2.7 - 我不明白这个 "os.join"函数是如何工作的？我不断收到错误，并且阅读操作系统函数对我没有帮助

Question

这是代码

sys.path.append( "../tools/" )
from parse_out_email_text import parseOutText #(its just another .py file that has a function I wrote)

from_sara  = open("from_sara.txt", "r")
from_chris = open("from_chris.txt", "r")

from_data = []
word_data = []

temp_counter = 0

for name, from_person in [("sara", from_sara), ("chris", from_chris)]:
  for path in from_person:
    ### only look at first 200 emails when developing
    ### once everything is working, remove this line to run over full dataset
    temp_counter += 1
    if temp_counter < 200:
        path = os.path.join('..', path[:-1]) #(THIS IS THE PART I CAN'T GET MY HEAD AROUND)
        print path
        email = open(path, "r")

        email.close()

print "emails processed"
from_sara.close()
from_chris.close()

当我运行它时，它给我一个错误，如下所示:

Traceback (most recent call last):
..\maildir/bailey-s/deleted_items/101.
File "C:/Users/AmitSingh/Desktop/Data/Udacity/Naya_attempt/vectorize_text.py", line 47, in <module>
email = open(path, "r")
IOError: [Errno 2] No such file or directory: '..\\maildir/bailey-s/deleted_items/101.'

我的笔记本电脑上什至没有这个 """'..\maildir/bailey-s/deleted_items/101.'"""目录路径，我尝试通过替换 '..' 来更改路径在代码中通过保存所有文件的文件夹的实际路径名，没有任何变化。

path = os.path.join('..', path[:-1])

此代码是机器学习在线类(class)的一部分，我已经在这一点上停留了 3 个小时。任何帮助将非常感激。

(P.S.这不是作业问题，也没有附加分数，它是免费的在线类(class))

Answer 1

您的测试数据不存在，因此找不到它。您应该再次运行启动代码并确保必要的 maildir 都在那里。