Improve import locations

[int-y1]

this fixes 1% of mypy errors

[codecov-commenter]

Codecov Report

Patch coverage: 72.72% and no project coverage change.

Comparison is base (b698088) 47.05% compared to head (ca98df6) 47.05%.
Report is 4 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2280   +/-   ##
=======================================
  Coverage   47.05%   47.05%           
=======================================
  Files         249      249           
  Lines       13209    13209           
=======================================
  Hits         6215     6215           
  Misses       6994     6994           

Files Changed	Coverage Δ
dmoj/urls.py	89.47% <ø> (ø)
judge/utils/problems.py	26.86% <0.00%> (ø)
judge/views/problem.py	24.35% <0.00%> (ø)
judge/views/two_factor.py	39.88% <66.66%> (ø)
judge/admin/interface.py	64.95% <100.00%> (+0.30%)	⬆️
judge/highlight_code.py	52.63% <100.00%> (+2.63%)	⬆️
judge/utils/stats.py	83.33% <100.00%> (-2.39%)	⬇️
judge/views/contests.py	28.96% <100.00%> (ø)

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[Riolku]

Why does this fix mypy errors? Because of the locations of type stubs?

[int-y1]

Why does this fix mypy errors? Because of the locations of type stubs?

mypy couldn't find the item in the module

judge/highlight_code.py:1: error: Module "django.utils.html" has no attribute "mark_safe"  [attr-defined]
judge/admin/interface.py:3: error: Module "django.contrib.flatpages.admin" has no attribute "FlatpageForm"  [attr-defined]
judge/views/contests.py:27: error: Module "django.views.generic.detail" does not explicitly export attribute "View"  [attr-defined]

[kiritofeng]

LGTM, thanks!