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pandas/numpy can be very slow to import, in some cases it takes multiple seconds to import pandas and it's also a huge library with a huge dependency on numpy, which can be a pain to install if you don't have binary package. This change makes panda an extra dependency so django-csv-exports can automatically use it when it's available, but otherwise use standard library csv module, and to load pandas lazily so it doesn't slow down running unrelated ./manage.py commands when the user has django-csv-exports installed in INSTALLED_APPS.