方法一：
打开cmd，输入python
>>> import selenium
>>> help(selenium)
Help on package selenium:
NAME
selenium
FILE
d:\python27\lib\site-packages\selenium\__init__.py
DESCRIPTION
# Licensed to the Software Freedom Conservancy (SFC) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The SFC licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
PACKAGE CONTENTS
common (package)
webdriver (package)
DATA
__version__ = '3.0.2'
VERSION
3.0.2
方法二：
打开cmd，输入pip show selenium