python如何读取bz2压缩包文件

目前代码：

from bz2 import BZ2File as b2f
import tarfile

fp = b2f("G:/30.json.bz2")
line = fp.readline()

print(line)

报如下错误：

 Traceback (most recent call last):
  File "C:/Users/Andy/PycharmProjects/Data cleaning/bz2.py", line 2, in <module>
    from bz2 import BZ2File as b2f
  File "C:\Users\Andy\PycharmProjects\Data cleaning\bz2.py", line 2, in <module>
    from bz2 import BZ2File as b2f
ImportError: cannot import name BZ2File

Process finished with exit code 1

你bz2的包有没有安装到python的第三方模块中。需要python setup.py install等安装