python传值和传引用

import copy
from prettyprinter import cpprint as p

        campaign_bigo_no = campaign_bigo = {
            'cpm': 0,
        }
        #  默认是传引用
        campaign_bigo['cpm'] = 1
        p(campaign_bigo_no)
        p(campaign_bigo)
        #  传值
        campaign_bigo_no = copy.deepcopy(campaign_bigo)
        campaign_bigo['cpm'] = 1
        p(campaign_bigo_no)
        p(campaign_bigo)