尽管安装了它，但没有Python模块

Question

我已经安装了xxhash模块：

sudo pip install --upgrade pip
sudo pip install xxhash

但是当我执行时：

pydoc modules

我得到一个可用模块的列表，其中没有xxhash。

当我在终端中运行GUI程序时，它给了我一个错误：

Python: Traceback (most recent call last):
  File "./runserver.py", line 34, in <module>
    from pogom.search import search_overseer_thread, fake_search_loop
  File "/SOME_PATH/resources/app/map/pogom/search.py", line 30, in <module>
    from pgoapi import PGoApi
  File "/SOME_PATH/resources/app/map/pogom/pgoapi/__init__.py", line 39, in <module>

Python:     from .pgoapi import PGoApi
  File "/SOME_PATH/resources/app/map/pogom/pgoapi/pgoapi.py", line 34, in <module>
    from .rpc_api import RpcApi
  File "/SOME_PATH/resources/app/map/pogom/pgoapi/rpc_api.py", line 47, in <module>
    from .utilities import to_camel_case, get_time, get_format_time_diff, Rand48, long_to_bytes, generateLocation1, generateLocation2, generateRequestHash, f2i
  File "/SOME_PATH/resources/app/map/pogom/pgoapi/utilities.py", line 37, in <module>
    import xxhash
ImportError: No module named xxhash

顺便说一下，2个第一个命令没有错误，当我重新运行它们时，它说这些模块已经安装并且是最新的。