def upgrade():
    op.alter_column('Shows', 'name', existing_type=sa.VARCHAR(), nullable=False)
    op.create_foreign_key(None, 'Shows', 'Venue', ['name'], ['name'])
def upgrade():
    op.alter_column('Shows', 'name', existing_type=sa.VARCHAR(), nullable=False)
    op.create_foreign_key(None, 'Shows', 'Venue', ['name'], ['name'])