如何有条件地填充熊猫列中的数据

Question

我正在尝试根据条件填充新的pandas数据框列。

df =名称，移动电话，年龄，新列

Mobile number begins with 99. new column = 9X Series
Mobile number begins with 88. new column = 8X Series
no mobile number. new_column = 'no mobile with user'

我该如何实现？