目前系統版本
cat /etc/redhat-release
CentOS Linux release 7.1.1503 (Core)
python版本 Python 2.7.5

pip安裝

安裝Scrapy

pip install Scrapy
結果出現

Command “/usr/bin/python -u -c “import setuptools, tokenize;file=’/tmp/pip-build-Qe8ky7/Twisted/setup.py’;f=getattr(tokenize, ‘open’, open)(file);code=f.read().replace(‘\r\n’, ‘\n’);f.close();exec(compile(code, file

, ‘exec’))” install –record /tmp/pip-FX_eyV-record/install-record.txt –single-version-externally-managed –compile” failed with error code 1 in /tmp/pip-build-Qe8ky7/Twisted/

而後安裝Scrapy 結果報錯

Exception:
Traceback (most recent call last):
File “/usr/lib/python2.7/site-packages/pip/basecommand.py”, line 215, in main
status = self.run(options, args)
File “/usr/lib/python2.7/site-packages/pip/commands/install.py”, line 335, in run
wb.build(autobuilding=True)
File “/usr/lib/python2.7/site-packages/pip/wheel.py”, line 749, in build
self.requirement_set.prepare_files(self.finder)
File “/usr/lib/python2.7/site-packages/pip/req/req_set.py”, line 380, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File “/usr/lib/python2.7/site-packages/pip/req/req_set.py”, line 634, in _prepare_file
abstract_dist.prep_for_dist()
File “/usr/lib/python2.7/site-packages/pip/req/req_set.py”, line 129, in prep_for_dist
self.req_to_install.run_egg_info()
File “/usr/lib/python2.7/site-packages/pip/req/req_install.py”, line 412, in run_egg_info
self.setup_py, self.name,
File “/usr/lib/python2.7/site-packages/pip/req/req_install.py”, line 387, in setup_py
import setuptools # noqa
File “/usr/lib/python2.7/site-packages/setuptools/init

.py”, line 12, in
import setuptools.version
File “/usr/lib/python2.7/site-packages/setuptools/version.py”, line 1, in
import pkg_resources
File “/usr/lib/python2.7/site-packages/pkg_resources/init.py”, line 72, in
import packaging.requirements
File “/usr/lib/python2.7/site-packages/packaging/requirements.py”, line 59, in
MARKER_EXPR = originalTextFor(MARKER_EXPR())(“marker”)
TypeError: call() takes exactly 2 arguments (1 given)

然後就大膽
vi /usr/lib/python2.7/site-packages/packaging/requirements.py
修改該檔案
#MARKER_EXPR = originalTextFor(MARKER_EXPR())(“marker”)
MARKER_EXPR = originalTextFor(MARKER_EXPR)(“marker”)

然後繼續pip install Scrapy 然而
報錯Failed building wheel for Twisted
而且沒什麼卵用我就改回去了

然後//就裝了這玩意兒 我也不知道這是幹啥的
yum install python-devel libffi-devel openssl-devel

氮素 pip install Scrapy 沒報錯~~
然而在執行scrapy -h 的時候
提示pkg_resources.ContextualVersionConflict: (pyasn1 0.1.6 (/usr/lib/python2.7/site-packages), Requirement.parse(‘pyasn1>=0.1.8’), set([‘pyasn1-modules’]))

然後就升級pyasn1吧
結果直接執行命令easy_install pyasn1 沒什麼卵用，安裝的還是版本還是0.1.6

這裡修正！！！

上面這樣升級pyasn1 只是在執行scrapy -h的時候沒毛病
但是再用scrapy 建立專案的時候 會報錯！！！
正確的做法應該是pip install –upgrade pyasn1來升級

然後執行scrapy -h 還是報錯
這裡有一大推錯誤 暫時不表
TLSVersion.TLSv1_1: SSL.OP_NO_TLSv1_1,
AttributeError: ‘module’ object has no attribute ‘OP_NO_TLSv1_1’

不讓人活啊有木有

結果發現在執行pip install Scrapy的時候 會有這麼一句
Requirement already satisfied: Twisted>=13.1.0 in /usr/lib64/python2.7/site-packages (from Scrapy)

就嘗試安裝一個13.1.0的Twisted的版本
pip install twisted==13.1.0

然後執行scrapy -h 終於成功。

總結

這次的安裝經歷告我們……千萬不要被中間的絕望所嚇倒….堅持一下,你就會發現,錯誤會越改越多……但是不要怕…..當你迭代到錯誤最多的時候在一個一個解決掉, 就OK啦……雖然說中間會走彎路, 雖然說中間無數次我想離開城市找一個小樹林隱居起來, 從此與世隔絕, 氮素堅持一下~ 就一定會搞定的(PS: 還好運氣好安裝好了…..到底中間裝的那個不知名的東西到底是什麼呢?~~強強晚安晚安強強)