当尝试通过运行以下代码行在Python中初始化H2O时：

import h2o
h2o.init()

我遇到了以下异常：

Traceback (most recent call last):
  File "C:/workspace/DataScience/univariate_analysis/prudential_RF.py", line 4, in <module>
    h2o.init()
  File "C:\Anaconda\lib\site-packages\h2o\h2o.py", line 668, in init
    H2OConnection(ip=ip, port=port,start_h2o=start_h2o,enable_assertions=enable_assertions,license=license,max_mem_size_GB=max_mem_size_GB,min_mem_size_GB=min_mem_size_GB,ice_root=ice_root,strict_version_check=strict_version_check)
  File "C:\Anaconda\lib\site-packages\h2o\connection.py", line 101, in __init__
    raise EnvironmentError, message
EnvironmentError: Version mismatch. H2O is version 3.2.0.9, but the python package is version 3.6.0.8.
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "C:\Anaconda\lib\atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "C:\Anaconda\lib\site-packages\h2o\connection.py", line 565, in end_session
    H2OConnection.delete(url_suffix="InitID")
  File "C:\Anaconda\lib\site-packages\h2o\connection.py", line 393, in delete
    return __H2OCONN__._do_raw_rest(url_suffix, "DELETE", None, **kwargs)
  File "C:\Anaconda\lib\site-packages\h2o\connection.py", line 483, in _do_raw_rest
    .format(http_result.status_code,http_result.reason,method,url,detailed_error_msgs))
EnvironmentError: h2o-py got an unexpected HTTP status code: 404 Not Found (method = DELETE; url = http://localhost:54321/3/InitID). detailed error messages: DELETE /3/InitID not found
Error in sys.exitfunc:
Traceback (most recent call last):
  File "C:\Anaconda\lib\atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "C:\Anaconda\lib\site-packages\h2o\connection.py", line 565, in end_session
    H2OConnection.delete(url_suffix="InitID")
  File "C:\Anaconda\lib\site-packages\h2o\connection.py", line 393, in delete
    return __H2OCONN__._do_raw_rest(url_suffix, "DELETE", None, **kwargs)
  File "C:\Anaconda\lib\site-packages\h2o\connection.py", line 483, in _do_raw_rest
    .format(http_result.status_code,http_result.reason,method,url,detailed_error_msgs))
EnvironmentError: h2o-py got an unexpected HTTP status code: 404 Not Found (method = DELETE; url = http://localhost:54321/3/InitID). detailed error messages: DELETE /3/InitID not found

请注意，我已经按照此链接中的安装步骤操作：直接从Python使用H2O

回答：

您的h2o Python代码和h2o Java代码版本不匹配。

如果您下载了最新的h2o版本，请确保您也使用相同的版本号进行pip安装。不要使用通用的pip install命令…而是明确指定URL和版本号。

下载Java包并启动Java jar文件：

然后点击安装Python链接以获取相应的pip安装命令：

请注意，这条命令需要与您刚安装的Java版本号匹配：

pip install http://h2o-release.s3.amazonaws.com/h2o/reltibshirani/8/Python/h2o-3.6.0.8-py2.py3-none-any.whl

然后再次尝试：

import h2o
h2o.init()

希望这对您有帮助！