Question

我有条件，需要在其中定义var并在此条件之外使用它。这是我的代码：

if 1 < (process_time % 60):
    final_process_time = 'process time is: ' + str(process_time) + ' sec!'
elif 1 <= (process_time % 60) < 60:
    process_time = process_time / 60
    final_process_time = 'process time is: ' + str(process_time) + ' min!'
elif 60 <= (process_time % 60):
    process_time = process_time / 3600
    final_process_time = 'process time is: ' + str(process_time) + ' hour(s)!'
print(final_process_time)

我收到此错误：

local variable 'final_process_time' referenced before assignment

提示： 我测试了这些解决方案，但没有一个响应：

Way 1:

set final_process_time to `global` # Error: name 'final_process_time' is not defined

Way 2:

Define final_process_time =''  Before conditions # Result: nothing set to this var

已附加： 有人建议我在此部分中投入更多代码来修复该错误。我的整个代码：（当然，还没有添加一些绝对不相关的项目）

def excel_report(request):
    output = io.BytesIO()
    workbook = xlsxwriter.Workbook(output)
    ....
    TITLES_LIST = [
            ['user', 'title', 'explains', 'organization', 'post', 'time_start', 'time_end'],
            ....
    ]
    FILE_NAME = 'report-' + datetime.datetime.now().strftime("%Y-%m-%d-%H-%M") + '.xlsx'
    # writer = pd.ExcelWriter(FILE_NAME, engine='xlswriter')
    if request.method == 'POST':
        if 'job_record' in request.POST:
            time_start_process = time.time()
            resumes = JobRecord.objects.all().values(*(TITLES_LIST[0][0]))
            titles_list = TITLES_LIST[0][0]
            worksheet = workbook.add_worksheet('Job Resume')
            worksheet.write_row('A1', titles_list, title_styles)
            for i in range(1, len(resumes) + 1):
                k = i - 1
                for j in range(len(titles_list) - 2):
                    worksheet.write(i, j, resumes[k][titles_list[j]], body_styles)
                worksheet.write(i, 5, resumes[k]['time_start'], time_style)
                worksheet.write(i, 6, resumes[k]['time_end'], time_style)
            process_time = time.time() - time_start_process
            if 1 < (process_time % 60):
                final_process_time = 'process time is: ' + str(process_time) + ' sec!'
            elif 1 <= (process_time % 60) < 60:
                process_time = process_time / 60
                final_process_time = 'process time is: ' + str(process_time) + ' min!'
            elif 60 <= (process_time % 60):
                process_time = process_time / 3600
                final_process_time = 'process time is: ' + str(process_time) + ' hour(s)!'
            worksheet = workbook.add_worksheet('process sheet')

            worksheet.write('A1', 'Process Time', title_styles)
            worksheet.write('A2', final_process_time, title_styles)
            workbook.close() 
            output.seek(0)
            response = HttpResponse(output,
                                content_type='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
            response['Content-Disposition'] = 'attachment; filename=%s' % FILE_NAME
            return response

Answer 1

在条件之前将final_process_time设置为有意义的值，或者在您再次将else子句设置为有意义的值的位置。不要让它global与问题无关。

在python中访问外部条件变量

1 个答案: