django--url 匹配，是个惰性匹配，匹配到前部分后就不会再接着匹配

urlpatterns = [
    path('', views.dashboard, name="sales_dashboard"),
    path('stu_enrollment/', views.stu_enrollment, name="stu_enrollment"),
    re_path('enrollment/(d+)/fileupload/', views.enrollment_fileupload, name="enrollment_fileupload"),  #这个url要写在上面

    re_path('enrollment/(d+)/', views.enrollment, name="enrollment"),

]