python - django读取文本文件以检索数据

Question

我面临着奇怪的问题。我的 Django 框架从模板获取参数以在读取文本文件后检索数据。在测试过程中，它表现得非常完美。但是，当我同时从两个浏览器传递相同的参数时，其中一个浏览器出现以下错误:

IOError at /search/
[Errno 2] No such file or directory:

虽然我知道文件在那里并且我的 python 脚本可以读取它。所以我想知道过去有人遇到过这种问题!!在 Django 中处理文件检索数据的最佳方法是什么？谢谢

我的 django 项目的部分代码

def search(request):
 if 'searchterm' in request.GET and request.GET['searchterm']:
    searchterm=request.GET['searchterm']
    searchtype= request.GET['searchtype']
    if len(searchterm)>0:
        pepfile = open(settings.BASE_DIR+'/filetoread/ReportBook_active_optimization.csv','r')
        contextres ={}
        concenrange={}
        for line in pepfile:
            data=line.strip()
            if not data.startswith('txtPeptideID'):
                info= data.split('\t')
                acclist=[]

                if searchtype =='Protein' and (str(searchterm)).lower() in info[2].lower():

                    for items in info[2].split('|'):
                        if (str(searchterm)).lower() in (items.strip()).lower():
                            itemsindex=(info[2].split('|')).index(items)
                            acclist.append((info[3].split('|'))[itemsindex])

                            transcountag6490=0
                            transpath=settings.BASE_DIR+'/tranisitionfilestoread'
                            curr_dir = os.getcwd()
                            os.chdir(transpath)

                            with open('transitions_6490_Agilent.csv', 'r') as transcountag6490file:
                                for line in transcountag6490file:
                                    if str(pepid) in line:
                                        transcountag6490=1
                                    else:
                                        transcountag6490=0
                            transcountag6490file.close()



        return render(request, 'resultform.html',  {'contextresultinfo': contextres, 'query': searchterm})
    else:
        return render(request, 'index.html', {'error': True})
else:
    return render(request, 'index.html', {'error': True})

错误的完整跟踪:

IOError at /search/

[Errno 2] No such file or directory: 'transitions_6490_Agilent.csv'

Request Method:     GET
Request URL:    http:/127.0.0.1:8000/:8000/search/?searchtype=Any&     searchterm=PEP2012090602
Django Version:     1.8.11
Exception Type:     IOError
Exception Value:    

[Errno 2] No such file or directory: 'transitions_6490_Agilent.csv'

Exception Location:     /home/paul/Desktop/djangoproject/trackerdatabase/src/trackerapp/views.py in search, line 188
Python Executable:  /usr/bin/python
Python Version:     2.7.6
Python Path:    

['/home/paul/Desktop/djangoproject/trackerdatabase/src',
'/usr/local/lib/python2.7/dist-packages/setuptools-20.3.1-py2.7.egg',
'/usr/local/lib/python2.7/dist-packages/pip-8.1.1-py2.7.egg',
'/usr/lib/python2.7',
'/usr/lib/python2.7/plat-x86_64-linux-gnu',
'/usr/lib/python2.7/lib-tk',
'/usr/lib/python2.7/lib-old',
'/usr/lib/python2.7/lib-dynload',
'/usr/local/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages/PILcompat',
'/usr/lib/python2.7/dist-packages/gtk-2.0',
 '/usr/lib/pymodules/python2.7',
 '/usr/lib/python2.7/dist-packages/ubuntu-sso-client']

Answer 1

我将把它留在这里作为答案，以便其他 SO 成员更容易找到。

您不需要创建os.chdir，只需直接向open() 调用提供文件的完整路径即可。

file_path = os.path.join(settings.BASE_DIR, 'tranisitionfilestoread', 'transitions_6490_Agilent.csv')
with open(file_path, 'r') as f:
    # do stuff