l = "egon:123:admin"
i = l.split(":")#i=l.split(":",1)以l列表内的：为分隔符，把左右两边用,号分隔开
显示结果为
['egon', '123', 'admin']

l = "egon:123:admin"
i = l.split(":",1)
print(i)

显示结果为

['egon', '123:admin']