WinError 2系统找不到指定的文件(Python)

时间:2017-03-03 06:58:38

标签: python python-2.7 python-3.x bioinformatics f2py

我有一个Fortran程序,想在python中为多个文件执行它。我有2000个输入文件,但在我的Fortran代码中,我一次只能运行一个文件。我应该如何在python中调用Fortran程序?

我的剧本:

import subprocess
import glob
input = glob.glob('C:/Users/Vishnu/Desktop/Fortran_Program_Rum/*.txt')
output = glob.glob('C:/Users/Vishnu/Desktop/Fortran_Program_Rum/Output/')
f = open("output", "w")
for i in input:
    subprocess.Popen(["FORTRAN ~/C:/Users/Vishnu/Desktop/Fortran_Program_Rum/phase1.f", "--domain "+i])
f.write(i)

错误:

runfile('C:/Users/Vishnu/Desktop/test_fn/test.py', wdir='C:/Users/Vishnu/Desktop/test_fn')
Traceback (most recent call last):

   File "<ipython-input-3-f8f378816004>", line 1, in <module>
runfile('C:/Users/Vishnu/Desktop/test_fn/test.py', wdir='C:/Users/Vishnu/Desktop/test_fn')

  File "C:\Users\Vishnu\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 866, in runfile
execfile(filename, namespace)

  File "C:\Users\Vishnu\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/Vishnu/Desktop/test_fn/test.py", line 30, in <module>
subprocess.Popen(["FORTRAN ~/C:/Users/Vishnu/Desktop/Fortran_Program_Rum/phase1.f", "--domain "+i])

  File "C:\Users\Vishnu\Anaconda3\lib\subprocess.py", line 707, in __init__
restore_signals, start_new_session)

  File "C:\Users\Vishnu\Anaconda3\lib\subprocess.py", line 990, in _execute_child
startupinfo)

FileNotFoundError: [WinError 2] The system cannot find the file specified

修改

import subprocess
import os
input = os.path.normcase(r'C:/Users/Vishnu/Desktop/Fortran_Program_Rum/*.txt')
output = os.path.normcase(r'~/C:/Users/Vishnu/Desktop/Fortran_Program_Rum/Output/')
f = open("output", "w")
for i in input:
    exe = os.path.normcase(r'~/C:/Program Files (x86)/Silverfrost/ftn95.exe')
    fortran_script = os.path.normcase(r'~/C:/Users/Vishnu/Desktop/test_fn/test_f2py.f95')
    i = os.path.normcase(i)
    subprocess.Popen([exe, fortran_script, "--domain", i])
    f.write(i)

错误:

FileNotFoundError: [WinError 2] The system cannot find the file specified

编辑 - 2:

我已更改我的脚本如下:但错误相同

input = os.path.normcase(r'C:/Users/Vishnu/Desktop/Fortran_Program_Rum/*.txt')
output = os.path.normcase(r'C:/Users/Vishnu/Desktop/Fortran_Program_Rum/Output/')
f = open("output", "w")
for i in input:
    exe = os.path.normcase(r'C:/Program Files (x86)/Silverfrost/ftn95.exe')
    fortran_script = os.path.normcase(r'C:/Users/Vishnu/Desktop/test_fn/test_f2py.f95')
    i = os.path.normcase(i)
    subprocess.Popen([exe, fortran_script, "--domain", i])
    f.write(i)

错误:2

FileNotFoundError: [WinError 2] The system cannot find the file specified

错误:3 - 15-03-2017

import subprocess
import os
input = os.path.normcase(r'C:/Users/Vishnu/Desktop/Fortran_Program_Rum/*.txt')
output = os.path.normcase(r'C:/Users/Vishnu/Desktop/Fortran_Program_Rum/Output/')
f = open('output', 'w+')
for i in input:
    exe = os.path.normcase(r'C:/Program Files (x86)/Silverfrost/ftn95.exe')
    fortran_script = os.path.normcase(r'C:/Users/Vishnu/Desktop/Fortran_Program_Rum/phase1.f')
    i = os.path.normcase(i)
    subprocess.Popen([exe, fortran_script, "--domain", i], shell = True)
    f.write(i)

**错误**

PermissionError: [Errno 13] Permission denied: 'output'

3 个答案:

答案 0 :(得分:7)

Popen期望非shell调用的字符串列表和shell调用的字符串。

使用shell = True调用subprocess.Popen:

process = subprocess.Popen(command, stdout=tempFile, shell=True)

希望这可以解决您的问题。

此问题列在此处: https://bugs.python.org/issue17023

答案 1 :(得分:1)

我认为你需要.f文件作为参数,而不是命令单字符串。与"--domain "+i相同,我将在列表的两个元素中拆分。 假设:

  • 您为FORTRAN可执行文件
  • 设置了路径
  • ~/确实是FORTRAN可执行文件
  • 的正确方法

我会改变这一行:

subprocess.Popen(["FORTRAN ~/C:/Users/Vishnu/Desktop/Fortran_Program_Rum/phase1.f", "--domain "+i])

subprocess.Popen(["FORTRAN", "~/C:/Users/Vishnu/Desktop/Fortran_Program_Rum/phase1.f", "--domain", i])

如果这不起作用,您应该为os.path.exists()文件执行.f,并检查您是否可以在没有任何路径的情况下启动FORTRAN可执行文件,并设置路径或相应的系统路径变量

[编辑2017年3月6日]

作为例外,在原帖中有详细说明,是来自subprocess的python异常; WinError 2可能是因为找不到FORTRAN

我强烈建议您为可执行文件指定完整路径:

for i in input:
    exe = r'c:\somedir\fortrandir\fortran.exe'
    fortran_script = r'~/C:/Users/Vishnu/Desktop/Fortran_Program_Rum/phase1.f'
    subprocess.Popen([exe, fortran_script, "--domain", i])

如果你需要将正斜杠转换为反斜杠,正如其中一条评论中所建议的那样,你可以这样做:

for i in input:
    exe = os.path.normcase(r'c:\somedir\fortrandir\fortran.exe')
    fortran_script = os.path.normcase(r'~/C:/Users/Vishnu/Desktop/Fortran_Program_Rum/phase1.f')
    i = os.path.normcase(i)
    subprocess.Popen([exe, fortran_script, "--domain", i])

[编辑2017年3月7日]

以下行不正确:

exe = os.path.normcase(r'~/C:/Program Files (x86)/Silverfrost/ftn95.exe'

我不确定为什么你有~/作为每个路径的前缀,不要这样做。

for i in input:
    exe = os.path.normcase(r'C:/Program Files (x86)/Silverfrost/ftn95.exe'
    fortran_script = os.path.normcase(r'C:/Users/Vishnu/Desktop/Fortran_Program_Rum/phase1.f')
    i = os.path.normcase(i)
    subprocess.Popen([exe, fortran_script, "--domain", i])

[第二次编辑2017年3月7日]

我不知道这个FORTRAN或ftn95.exe,它是否需要shell才能正常运行?在这种情况下你需要按如下方式启动:

subprocess.Popen([exe, fortran_script, "--domain", i], shell = True)

您确实需要尝试从运行python脚本的工作目录中手动启动命令。获得实际工作的命令后,再构建subprocess命令。

答案 2 :(得分:1)

谢谢你,你的第一个错误指导我,解决方案也解决了我的问题!

对于权限错误f = open('output', 'w+'),请将其更改为f = open(output+'output', 'w+')

或其他,但你现在使用的方式是访问通常在Program Files中的Python安装目录,它可能需要管理员权限。

当然,您可能以管理员身份运行python /您的脚本以通过权限错误

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