NLTK 3.2.2 安装经验

Nltk 3.2.2要求Python版本是Python2.7 或者Python3.4+。
Nltk 3.2.3 如果是从网站上直接下载程序进行安装可能会报错：Python version -32 required, which was not found in the registry，

原因可能有以下几方面：

1) Python版本不对：重新安装合适的Python版本

2) Python注册信息未加入到注册表中

3) Python注册信息不对

针对后面两种情况，我们可以直接通过脚本register.py(具体代码内容见本文后面)建立注册信息，然后运行该脚本。注册信息添加成功后重新安装nltk模块即可。

Python3.0 以上版本都自带有pip,可以通过pip快捷安装nltk的最新版本，但为了保证库的版本最新，可以先更新pip

1) 更新pip：py –m pip install –upgrade pip

2) 安装nltk: py –m pip install nltk

当出现打印消息：successfully installed nltk-3.2.2 six-1.10.0时表示安装成功。

#===========================register.py=======================================##
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import sys
from winreg import *

# tweak as necessary
version = sys.version[:3]
installpath = sys.prefix

regpath = "SOFTWARE\Python\Pythoncore\%s\" % (version)
installkey = "InstallPath"
pythonkey = "PythonPath"
pythonpath = "%s;%s\Lib\;%s\DLLs\" % (
    installpath, installpath, installpath
)

def RegisterPy():
    
    try:
        reg = OpenKey(HKEY_CURRENT_USER, regpath)
    except EnvironmentError as e:
        try:
            reg = CreateKey(HKEY_CURRENT_USER, regpath)
            SetValue(reg, installkey, REG_SZ, installpath)
            SetValue(reg, pythonkey, REG_SZ, pythonpath)
            CloseKey(reg)
        except:
            print ("*** Unable to register!")
            return
        print ("--- Python", version, "is now registered!")
        return
    if (QueryValue(reg, installkey) == installpath and
        QueryValue(reg, pythonkey) == pythonpath):
        CloseKey(reg)
        print ("=== Python", version, "is already registered!")
        return
    CloseKey(reg)
    print ("*** Unable to register!")
    print ("*** You probably have another Python installation!")

RegisterPy()

NLTK 3.2.2 安装经验

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