Python錯誤：WindowsError：[錯誤2]系統找不到指定的文件：

Question

如下代碼：

import subprocess

collection = filename[:filename.find('.')]

working_directory = 'C://Users//Admin//Downloads//'
json_file = filename + '.json'

mongoimport_cmd = 'mongoimport -h 127.0.0.1:27017 ' + \
                  '--db ' + db_name + \
                  ' --collection ' + collection + \
                  ' --file ' + working_directory + json_file

# Before importing, drop collection if it exists (i.e. a re-run)
if collection in db.collection_names():
    print 'Dropping collection: ' + collection
    db[collection].drop()

# Execute the command
print 'Executing: ' + mongoimport_cmd

subprocess.call(mongoimport_cmd.split())

給我這個錯誤（WindowsError：[Error 2]系統找不到指定的文件）：

Executing: mongoimport -h 127.0.0.1:27017 --db sacramento --collection sacramento --file C:/Users/Admin/Downloads/sacramento.osm.json

---------------------------------------------------------------------------
WindowsError                              Traceback (most recent call last)
<ipython-input-232-09c1f8f6a3e4> in <module>()
     16 print 'Executing: ' + mongoimport_cmd
     17 
---> 18 subprocess.call(mongoimport_cmd.split())

C:\Users\Admin\Anaconda2\envs\DAND\lib\subprocess.pyc in call(*popenargs, **kwargs)
    521     retcode = call(["ls", "-l"])
    522     """
--> 523     return Popen(*popenargs, **kwargs).wait()
    524 
    525 

C:\Users\Admin\Anaconda2\envs\DAND\lib\subprocess.pyc in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags)
    709                                 p2cread, p2cwrite,
    710                                 c2pread, c2pwrite,
--> 711                                 errread, errwrite)
    712         except Exception:
    713             # Preserve original exception in case os.close raises.

C:\Users\Admin\Anaconda2\envs\DAND\lib\subprocess.pyc in _execute_child(self, args, executable, preexec_fn, close_fds, cwd, env, universal_newlines, startupinfo, creationflags, shell, to_close, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite)
    957                                          env,
    958                                          cwd,
--> 959                                          startupinfo)
    960             except pywintypes.error, e:
    961                 # Translate pywintypes.error to WindowsError, which is

WindowsError: [Error 2] The system cannot find the file specified

嘗試過的事情：

os.path.abspath。 將文件路徑更改為相對，絕對，原始字符串，雙反沖。 執行此檢查時，mongodb在后台運行。

Answer 1

在Windows中，最佳做法是使用類似路徑。

working_directory = r'C:\Users\Admin\Downloads'

和使用

import os
file_path = os.path.join(working_directory, json_file)

用於路徑串聯。

Answer 2

對於Windows，您有錯誤的斜杠，應該是反斜杠\\\\而不是正斜杠。

錯誤代碼2表示找不到文件（ https://msdn.microsoft.com/zh-cn/library/windows/desktop/ms681382(v=vs.85).aspx ）

您還需要確保文件存在（json文件）。 如果您在Windows中轉到命令行並運行以下命令：

C:\Users\Admin\Downloads>dir  C:\Users\Admin\Downloads\<yourfile>.json
 Volume in drive C is Windows8_OS
 Volume Serial Number is CC65-A251

 Directory of C:\Users\Admin\Downloads

06/03/2017  02:05 PM         2,390,114 <yourfile>.json
               1 File(s)      2,390,114 bytes
               0 Dir(s)  723,947,110,400 bytes free

將working_directory變量更改為如下可能會解決您的問題working_directory = 'C:\\\\Users\\\\Admin\\\\Downloads\\\\'