Python 从临时文件读取不成功

Question

with tempfile.NamedTemporaryFile(delete = False) as tmpfile:
    subprocess.call(editor + [tmpfile.name])    # editor = 'subl -w -n' for example 
    tmpfile.seek(0)
    print tmpfile.read()

... 打开我的 Sublime Text 但是当我输入内容并关闭文件时，我没有输出也没有错误，只有一个空行（在 Python 2 上）。是的，程序会等到我写完。

编辑：
我刚刚发现这可能是 Sublime Text 特有的问题，因为 vi、emacs 和 nano 在作为编辑器输入时都工作正常。但我仍然想知道如何解决这个问题。

Answer 1

根据 "edit" 部分，您可以保存文件然后重新打开它，这可能不是最好的解决方案，也不是 "solve" 原来的问题，但在至少它应该有效：

import subprocess
import tempfile

editor = ['gedit']

with tempfile.NamedTemporaryFile(delete=False) as tmpfile:
    subprocess.call(editor + [tmpfile.name])    # editor = 'subl -w -n' for example 
    tmpfile.file.close()
    tmpfile = file(tmpfile.name)
    print tmpfile.read()

Answer 2

如果直接写入输出文件，则按原样工作：

#!/usr/bin/env python
import subprocess
import sys
import tempfile

editor = [sys.executable, '-c', "import sys;"
                                "open(sys.argv[1], 'w').write('abc')"]
with tempfile.NamedTemporaryFile() as file:
    subprocess.check_call(editor + [file.name])
    file.seek(0)
    print file.read() # print 'abc'

编辑器先写入自己的临时文件，最后重命名失败：

#!/usr/bin/env python
import subprocess
import sys
import tempfile

editor = [sys.executable, '-c', r"""import os, sys, tempfile
output_path = sys.argv[1]
with tempfile.NamedTemporaryFile(dir=os.path.dirname(output_path),
                                 delete=False) as file:
    file.write(b'renamed')
os.rename(file.name, output_path)
"""]
with tempfile.NamedTemporaryFile() as file:
    subprocess.check_call(editor + [file.name])
    file.seek(0)
    print file.read() #XXX it prints nothing (expected 'renamed')

重新打开文件帮助：

#!/usr/bin/env python
import os
import subprocess
import sys
import tempfile

editor = [sys.executable, '-c', r"""import os, sys, tempfile
output_path = sys.argv[1]
with tempfile.NamedTemporaryFile(dir=os.path.dirname(output_path),
                                 delete=False) as file:
    file.write(b'renamed')
os.rename(file.name, output_path)
"""]
try:
    with tempfile.NamedTemporaryFile(delete=False) as file:
        subprocess.check_call(editor + [file.name])
    with open(file.name) as file:
        print file.read() # print 'renamed'
finally:
    os.remove(file.name)

Python 从临时文件读取不成功

Python reading from tempfile not successful

python

subprocess

temporary-files

readfile