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## 在学习爬虫中遇到很多坑，写出来供道友参考
modulenotfounderror: no module named 'js2xml'
nameerror: name 'js2xml' is not defined
则可能是库没有导入
jsondecodeerror: extra data: line 1 column 234701 (char 234700)
则可能是 str 不符合 json 格式
1. 可以用 start 和 end 标示开头结尾，如 str[start, end] ；
2. 可以对 str 进行剪切，使用 strip('symbol') 方法，对首尾存在 symbol 的进行剪切
又或者是存在多重结构，则
one-liner for your problem:
我要评论 data = [json.loads(line) for line in open('tweets.json', 'r')]
。。。存坑
过去一段时间后，再次运行 jupyter notebook，出现错误
错误：
'jupyter' 不是内部或外部命令，也不是可运行的程序
原因及解决：环境变量中添加 d:\users\23525\anaconda3\scripts，里面有 jupyter_notebook.exe、pip.exe 等命令
然后又出现如下错误：
traceback (most recent call last):
file "c:\programdata\anaconda3\scripts\jupyter-notebook-script.py", line 6, in <module>
from notebook.notebookapp import main
file "c:\programdata\anaconda3\lib\site-packages\notebook\notebookapp.py", line 47, in <module>
from zmq.eventloop import ioloop
file "c:\programdata\anaconda3\lib\site-packages\zmq\__init__.py", line 47, in <module>
from zmq import backend
file "c:\programdata\anaconda3\lib\site-packages\zmq\backend\__init__.py", line 40, in <module>
reraise(*exc_info)
file "c:\programdata\anaconda3\lib\site-packages\zmq\utils\sixcerpt.py", line 34, in reraise
raise value
file "c:\programdata\anaconda3\lib\site-packages\zmq\backend\__init__.py", line 27, in <module>
_ns = select_backend(first)
file "c:\programdata\anaconda3\lib\site-packages\zmq\backend\select.py", line 27, in select_backend
mod = __import__(name, fromlist=public_api)
file "c:\programdata\anaconda3\lib\site-packages\zmq\backend\cython\__init__.py", line 6, in <module>
from . import (constants, error, message, context,
importerror: dll load failed: 找不到指定的模块。
原因：问题都出现在 zmq 文件夹中，搜索答案需要重新安装 zmq
解决：
pip uninstall pyzmq
pip install pyzmq
在 install 时又出现如下错误：
pip is configured with locations that require tls/ssl, however the ssl module in python is not available. collecting pyzmq
retrying (retry(total=4, connect=none, read=none, redirect=none, status=none)) after connection broken by 'sslerror("can't connect to https url because the ssl module is not available.")': /simple/pyzmq/
retrying (retry(total=3, connect=none, read=none, redirect=none, status=none)) after connection broken by 'sslerror("can't connect to https url because the ssl module is not available.")': /simple/pyzmq/
retrying (retry(total=2, connect=none, read=none, redirect=none, status=none)) after connection broken by 'sslerror("can't connect to https url because the ssl module is not available.")': /simple/pyzmq/
retrying (retry(total=1, connect=none, read=none, redirect=none, status=none)) after connection broken by 'sslerror("can't connect to https url because the ssl module is not available.")': /simple/pyzmq/
retrying (retry(total=0, connect=none, read=none, redirect=none, status=none)) after connection broken by 'sslerror("can't connect to https url because the ssl module is not available.")': /simple/pyzmq/
could not fetch url https://pypi.org/simple/pyzmq/: there was a problem confirming the ssl certificate: httpsconnectionpool(host='pypi.org', port=443): max retries exceeded with url: /simple/pyzmq/ (caused by sslerror("can't connect to https url because the ssl module is not available.")) - skipping
could not find a version that satisfies the requirement pyzmq (from versions: ) no matching distribution found for pyzmq pip is configured with locations that require tls/ssl, however the ssl module in python is not available.
could not fetch url https://pypi.org/simple/pip/: there was a problem confirming the ssl certificate: httpsconnectionpool(host='pypi.org', port=443): max retries exceeded with url: /simple/pip/ (caused by sslerror("can't connect to https url because the ssl module is not available.")) - skipping
原因：
我得到了相同的“ssl模块不可用”错误运行anaconda附带的原生点（目前为18.1）。在我的例子中，这是一个系统路径问题，我通过将以下目录添加到我的路径变量来解决：
%miniconda3_dir%;%miniconda3_dir%\library\mingw-w64\bin;%miniconda3_dir%\library\usr\bin;%miniconda3_dir%\library\bin;%miniconda3_dir%\scripts;%miniconda3_dir%\bin;
在哪里，%miniconda3_dir%应该用你的miniconda（或anaconda）安装路径代替。
参考：
其实出现一段时间不能运行的程序，重新安装是最简单的操作，但我想要真正得解决问题，让我对世界能多少掌握一点控制权。通过一步步发现问题、解决问题、总结及预防，不正是人类发展的恒在规律吗？希望人类继承和探索之路长明。
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