使用tempfile.NamedTemporaryFile()报错PermissionError: [Errno 13] Permission denied

有问题就先查一下官方文档，内容如下:

"""
 tempfile.NamedTemporaryFile([mode='w+b'[, bufsize=-1[, suffix=''[, prefix='tmp'[, dir=None[, delete=True]]]]]])
This function operates exactly as TemporaryFile() does, except that the file is guaranteed to have a visible name in the file 
system (on Unix, the directory entry is not unlinked). That name can be retrieved from the name attribute of the returned file-like 
object. Whether the name can be used to open the file a second time, while the named temporary file is still open, varies across 
platforms (it can be so used on Unix; it cannot on Windows NT or later). If delete is true (the default), the file is deleted as 
soon as it is closed.The returned object is always a file-like object whose file attribute is the underlying true file object. 
This file-like object can be used in a with statement, just like a normal file.
"""
# 翻译如下
"""
该功能的运行方式完全相同TemporaryFile()，只是保证文件在文件系统中具有可见的名称（在Unix上，目录条目未取消链接）。
可以从name返回的类似文件的对象的属性中检索该名称。在命名的临时文件仍处于打开状态时，是否可以使用该名称第二次打开文件，
会因平台而异（可以在Unix上使用；在Windows NT或更高版本上不能使用）。如果delete为true（默认设置），则在关闭文件后立即将其删除。
返回的对象始终是类似文件的对象，其file 属性是基础真实文件对象。with就像普通文件一样，可以在语句中使用该文件状对象。
"""

在使用tempfile.NamedTemporaryFile()创建临时文档后，不能对文件进行读写操作，因为创建的是临时文档，文件被关闭后会自动删除。

import tempfile
import json

data = [{'name': 'rocky', 'like': ('python', 'c++'), 'age': 23}]
# NamedTemporaryFile会在退出时，删除该文件，加上delete=False后会保留该文件，这样可以对文件再次操作
f = tempfile.NamedTemporaryFile(mode='w+')
# f = tempfile.NamedTemporaryFile(mode='w+', delete=False)
json.dump(data, f)
f.flush()
# f.close()
print(open(f.name, 'r').read())
# f.remove()

# 运行结果如下：
"""
aceback (most recent call last):
  File "<input>", line 1, in <module>
  File "D:\Programs\PyCharm 2018.3\helpers\pydev\_pydev_bundle\pydev_umd.py", line 198, in runfile
    pydev_imports.execfile(filename, global_vars, local_vars)  # execute the script
  File "D:\Programs\PyCharm 2018.3\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
    exec(compile(contents+"\n", file, 'exec'), glob, loc)
  File "G:/A_Code/Python_Code/Python_exe/lib_json.py", line 11, in <module>
    print(open(f.name, 'r').read())
PermissionError: [Errno 13] Permission denied: 'C:\\Users\\Duke\\AppData\\Local\\Temp\\tmpjwaq13hs'
"""

**

如果想对其进行操作，需要在创建文档时加上delete=False

**

f = tempfile.NamedTemporaryFile(mode='w+', delete=False)

本文地址：https://blog.csdn.net/K_Duke/article/details/107643714