Question

在下面的代码中，它将out_file作为字符串读取，我似乎无法弄清楚原因。如果我不将其视为字符串，则表示文件位置不正确。它显然很好地读取了src_dir。在此先感谢您的帮助。我是python的新手并且自学。

import os
import os.path
import shutil

'''This is supposed to read through all the text files in a folder and
copy the text inside to a master file.'''

#   This gets the source and target directories for reading writing the
#   files respectively

src_dir = r'E:\filepath\text_files'
out_file = r'E:\filepath\master.txt'
files = (os.listdir(src_dir))
def valid_path(dir_path, filename):
    full_path = os.path.join(dir_path, filename)
    return os.path.isfile(full_path)
file_list = [os.path.join(src_dir, f) for f in files if valid_path(src_dir, f)]    


#   This should open the directory and make a string of all the files
#   listed in the directory. I need it to open them one by one, write to the
#   master file and close it when completely finished.


open(out_file, 'a+')
with out_file.open() as outfile:
    for element in file_list:
        open(element)
        outfile.append(element.readlines())

out_file.close()

print 'Finished'

Answer 1

这是错的：

open(out_file, 'a+')
with out_file.open() as outfile:
    for element in file_list:
        open(element)
        outfile.append(element.readlines())

out_file.close()

open，read，write，readlines的正确用法是：

f = open(path_to_file, ...)
f.write(data)
data = f.read()
lines = f.readlines()
f.close()

[以上不是有效或有效的脚本，只是如何调用每个方法的示例]

为了帮助您解决特定用例：

with open(out_file, 'a+') as outfile:
    for element in file_list:
        with open(element) as infile:
            outfile.write(infile.read())

如果您使用close()关闭（with的全部内容，那么您不需要with：它会为您关闭。）
由于您想要从一个文件中读取所有内容并写入另一个文件，因此请使用read()而不是readlines()：即获取全部内容，写下全部内容。
< / LI>
如果你真的想使用readlines()，那么这样的事情会更好：
```
outfile.write(''.join(infile.readlines())
```

读取路径＆gt;文件为字符串 - “AttributeError：'str'对象没有属性'open'”为什么？

1 个答案: