Python，os.listdir()错误

Question

我在写这个程序

def get_special_paths(dir):
    detected_paths = []
    paths = os.listdir(dir)
    for path in paths:
        if path == r'__\w+__':
            detected_paths.append(path)
    for element in detected_paths:
        index = detected_path.index(element)
        detected_paths[index] = os.path.abspath(element)
    return detected_paths

它引发一个类型错误，如下所示：

Traceback (most recent call last):
  File"copyspecial.py", line 65, in <module>
    get_special_paths(dir)
  File"copysepcial.py", line 23, in get_special_paths
    paths = os.listdir(pathname)
TypeError: coercing to Unicode: need string or buffer, builtin_function_or_method found

这个错误的含义是什么，我如何纠正它？(预先谢谢:)

Answer 1

似乎您将dir内置函数传递给了get_special_paths

>>> dir
<built-in function dir>

>>> os.listdir(dir)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: coercing to Unicode: need string or buffer, builtin_function_or_method found

以字符串的形式传递路径。

get_special_paths('/path/to/dir')

顺便说一句，不要使用dir作为变量名。它将遮挡上述dir函数。

Answer 2

可能是因为这里没有定义global_path：

for element in detected_paths:
    index = detected_path.index(element) # Here detected_path is undefined

让它成为global_paths，并尝试：

for element in detected_paths:
    index = detected_paths.index(element)