經常使用模塊學習（一）

                             經常使用模塊學習（一）

• 經常使用模塊學習—小雞湯

         推薦節目—曉說：

               《曉說》是2012年3月高曉鬆開始主持的網絡脫口秀節目

                每期由主持人高曉鬆談論一個熱門話題，打造視頻化的「高曉鬆專欄文章」

• 經常使用模塊學習—模塊的種類和導入方法

  '''
  一、什麼是模塊？
  在計算機程序的開發過程當中，隨着程序代碼越寫越多，在一個文件裏代碼就會愈來愈長，愈來愈不容易維護。
  爲了編寫可維護的代碼，咱們把不少函數分組，分別放到不一樣的文件裏，這樣，每一個文件包含的代碼就相對較少，不少編程語言都採用這種組織代碼的方式。
  在Python中，一個.py文件就稱之爲一個模塊（Module）。
  
  二、使用模塊的好處：
  最大的好處是大大提升了代碼的可維護性。
  編寫代碼沒必要從零開始，當一個模塊編寫完畢，就能夠被其餘地方引用。
  使用模塊還能夠避免函數名和變量名衝突。
  
  三、模塊的分類：
  內置標準模塊（又稱標準庫）執行help('modules')查看全部python自帶模塊列表
  第三方開源模塊，可經過pip install 模塊名 聯網安裝
  自定義模塊
  
  四、模塊的調用（模塊一旦被調用，即至關於執行了另一個py文件裏的代碼）：
  import module               導入模塊
  from module import xx,xx              從 module 模塊中再導入 xx
  from module.xx.xx import xx as rename          as  起別名
  from module.xx.xx import *           * 表明全部，不建議使用，變量名容易衝突
  '''
  import os
  import sys
  from os import rmdir
  from os import rmdir,rename      #使用逗號分隔，導入多個
  print(help('modules'))           #查看全部python自帶模塊列表

  help('modules')
  Please wait a moment while I gather a list of all available modules...
  __future__          _warnings           http                secrets
  _abc                _weakref            idlelib             select
  _ast                _weakrefset         imaplib             selectors
  _asyncio            _winapi             imghdr              setup
  _bisect             abc                 imp                 setup_cython
  _blake2             aifc                importlib           setuptools
  _bootlocale         antigravity         inspect             shelve
  _bz2                argparse            interpreterInfo     shlex
  _codecs             array               io                  shutil
  _codecs_cn          ast                 ipaddress           signal
  _codecs_hk          asynchat            itertools           site
  _codecs_iso2022     asyncio             json                sitecustomize
  _codecs_jp          asyncore            keyword             smtpd
  _codecs_kr          atexit              lib2to3             smtplib
  _codecs_tw          audioop             linecache           sndhdr
  _collections        backend_interagg    locale              socket
  _collections_abc    base64              logging             socketserver
  _compat_pickle      bdb                 lzma                sqlite3
  _compression        binascii            macpath             sre_compile
  _contextvars        binhex              mailbox             sre_constants
  _csv                bisect              mailcap             sre_parse
  _ctypes             builtins            marshal             ssl
  _ctypes_test        bz2                 math                stat
  _datetime           cProfile            mimetypes           statistics
  _decimal            calendar            mmap                string
  _distutils_findvs   cgi                 modulefinder        stringprep
  _dummy_thread       cgitb               msilib              struct
  _elementtree        chardet             msvcrt              subprocess
  _functools          chunk               multiprocessing     sunau
  _hashlib            cmath               netrc               symbol
  _heapq              cmd                 nntplib             symtable
  _imp                code                nt                  sys
  _io                 codecs              ntpath              sysconfig
  _json               codeop              nturl2path          tabnanny
  _locale             collections         numbers             tarfile
  _lsprof             colorsys            opcode              telnetlib
  _lzma               compileall          operator            tempfile
  _markupbase         concurrent          optparse            test
  _md5                configparser        os                  test_pydevd_reload
  _msi                contextlib          parser              tests_pydevd
  _multibytecodec     contextvars         pathlib             tests_pydevd_mainloop
  _multiprocessing    copy                pdb                 tests_pydevd_python
  _opcode             copyreg             pickle              textwrap
  _operator           crypt               pickletools         this
  _osx_support        csv                 pip                 threading
  _overlapped         ctypes              pipes               time
  _pickle             curses              pkg_resources       timeit
  _py_abc             dataclasses         pkgutil             tkinter
  _pydecimal          datetime            platform            token
  _pydev_bundle       dbm                 plistlib            tokenize
  _pydev_imps         decimal             poplib              trace
  _pydev_runfiles     difflib             posixpath           traceback
  _pydevd_bundle      dis                 pprint              tracemalloc
  _pydevd_frame_eval  distutils           profile             tty
  _pyio               doctest             pstats              turtle
  _queue              dummy_threading     pty                 turtledemo
  _random             easy_install        py_compile          types
  _sha1               email               pyclbr              typing
  _sha256             encodings           pycompletionserver  unicodedata
  _sha3               ensurepip           pydev_app_engine_debug_startup unittest
  _sha512             enum                pydev_coverage      urllib
  _signal             errno               pydev_ipython       uu
  _sitebuiltins       faulthandler        pydev_pysrc         uuid
  _socket             filecmp             pydev_run_in_console venv
  _sqlite3            fileinput           pydevconsole        warnings
  _sre                fnmatch             pydevd              wave
  _ssl                formatter           pydevd_concurrency_analyser weakref
  _stat               fractions           pydevd_file_utils   webbrowser
  _string             ftplib              pydevd_plugins      winreg
  _strptime           functools           pydoc               winsound
  _struct             gc                  pydoc_data          wsgiref
  _symtable           genericpath         pyexpat             xdrlib
  _testbuffer         getopt              queue               xml
  _testcapi           getpass             quopri              xmlrpc
  _testconsole        gettext             random              xxsubtype
  _testimportmultiple glob                re                  zipapp
  _testmultiphase     gzip                reprlib             zipfile
  _thread             hashlib             rlcompleter         zipimport
  _threading_local    heapq               runfiles            zlib
  _tkinter            hmac                runpy               
  _tracemalloc        html                sched               
  Enter any module name to get more help.  Or, type "modules spam" to search
  for modules whose name or summary contain the string "spam".

   

 

• 經常使用模塊學習—模塊的導入路徑

        

#模塊一旦被調用，即至關於執行了另一個py文件裏的代碼
#自定義模塊
#這個最簡單， 建立一個.py文件，就能夠稱之爲模塊，就能夠在另一個程序裏導入
import sys
print(sys.path)
'''
輸出：
[
'E:\\Python\\work\\myFirstPro\\第4章', 
'E:\\Python', 
'C:\\Python37\\python37.zip', 
'C:\\Python37\\DLLs', 
'C:\\Python37\\lib', 
'C:\\Python37', 
'C:\\Python37\\lib\\site-packages', 
'C:\\JetBrains\\PyCharm 
2018.2.1\\helpers\\pycharm_matplotlib_backend'
]

sys.path.append('E:\\Python\\work\\myFirstPro\\第4章')
print(sys.path)
#import my_modules
#del my_modules

小結：
python解釋器會按照列表順序去依次到每一個目錄下去匹配你要導入的模塊名，
只要在一個目錄下匹配到了該模塊名，就馬上導入，再也不繼續日後找。
注意：列表第一個元素爲空，即表明當前目錄，因此你本身定義的模塊在當前目錄會被優先導入。
'''

 

• 經常使用模塊學習—開源模塊的安裝方式

  •      開源模塊

                     https://pypi.python.org/pypi 是python的開源模塊庫，截止2017年9.30日 ，已經收錄了118170個來自全世界python開發者貢獻的模塊,幾乎涵蓋了你想用python作的任何事情。 事實上每一個python開發者，只要註冊一個帳號就能夠往這個平臺上傳你本身的模塊，這樣全世界的開發者均可以容易的下載並使用你的模塊。

          

        

       直接在上面這個頁面上點download,下載後，解壓並進入目錄，執行如下命令完成安裝

編譯源碼    python setup.py build
      安裝源碼    python setup.py install
 

      直接經過pip安裝   

pip3 install paramiko #paramiko 是模塊名   安裝
     pip3 uninstal paramiko      卸載
     import paramiko           使用

             pip命令會自動下載模塊包並完成安裝。

             軟件通常會被自動安裝你python安裝目錄的這個子目錄裏

/your_python_install_path/3.6/lib/python3.6/site-packages

• 經常使用模塊學習—使用國內源文件下載

         pip命令默認會鏈接在國外的python官方服務器下載，速度比較慢，你還可使用國內的豆瓣源，數據會按期同步國外官網，速度快好多。

sudo pip install -i http://pypi.douban.com/simple/ alex_sayhi --trusted-host pypi.douban.com   #alex_sayhi是模塊名

Microsoft Windows [版本 10.0.17134.285]
(c) 2018 Microsoft Corporation。保留全部權利。

E:\Python>pip3 install PyTyrion
Collecting PyTyrion
  Using cached https://files.pythonhosted.org/packages/c4/22/167ec8e203b0f930582a82a1bfcf7faf9d14af3  Using cached https://files.pythonhosted.org/packages/c4/22/167ec8e203b0f930582a82a1bfc  Using cached https://files.pythonhosted.org/packages/c4/22/167ec8e203b0f930582a82a1b  Using cached https://files.pythonhosted.org/packages/c4/22/167ec8e203b0f930582a82a
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2a
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8b0f930582a82a1bfcf7faf9d14af3a0d6abc807dbb22ed52f8/PyTyrion-1.0.1.tar
e203b0f930582a82a1bfcf7faf9d14af3a0d6abc807dbb22ed52f8/PyTyrion-1.
  Using cached https://files.pythonhosted.org/packages/c4/22/167
ec
8e203b0f930582a82a1bfcf7faf9d14af3a0d6abc807dbb22ed52f8/PyTyrion
-1
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67
ec8e203b0f930582a82a1bfcf7faf9d14af3a0d6abc807dbb22ed52f8/PyTy
ri
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3b0f930582a82a1bfcf7faf9d14af3a0d6abc807dbb22ed52f8/PyTyrion-1.0.1.t
ar.gz
Installing collected packages: PyTyrion
  Running setup.py install for PyTyrion ... done
Successfully installed PyTyrion-1.0.1
You are using pip version 10.0.1, however version 18.0 is availabl
eou should consider upgrading via the 'python -m pip install --upgrad
You are using pip version 10.0.1, however version 18.0 is avai
l.
You are using pip version 10.0.1, however version 18.0 is a
va
You are using pip version 10.0.1, however version 18.0 is a
You are using pip version 10.0.1, however version 18.0 
  Running setup.py install for PyTyrion ... done
Successfully installed PyTyrion-1.0.1
You are using pip version 10.0.1, however version 18.0 is
 available.
You should consider upgrading via the 'python -m pip inst
all --upgrade pip' command.

E:\Python>pip3 uninstall PyTyrion
Uninstalling PyTyrion-1.0.1:
  Would remove:
    c:\python37\lib\site-packages\pytyrion-1.0.1-py3.7.eg
g-info
    c:\python37\lib\site-packages\tyrion\*
Proceed (y/n)? y
  Successfully uninstalled PyTyrion-1.0.1
You are using pip version 10.0.1, however version 18.0 is
 available.
You should consider upgrading via the 'python -m pip inst
all --upgrade pip' command.

E:\Python>pip3 install PyTyrion
Collecting PyTyrion
  Using cached https://files.pythonhosted.org/packages/c4/22/167ec8e203b0f930582a82a1bfcf7faf
9d14af3a0d6abc807dbb22ed52f8/PyTyrion-1.0.1.tar.gz
Installing collected packages: PyTyrion
  Running setup.py install for PyTyrion ... done
Successfully installed PyTyrion-1.0.1
You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
(venv) E:\Python>pip3 install -i http://pypi.douban.com/simp
le/alex_sayhi --trusted-host pypi.douban.com
You must give at least one requirement to install (see "pip help install")
You are using pip version 9.0.3, however version 10.0.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

(venv) E:\Python>pip3 install -i http://pypi.douban.com/simp
le/ alex_sayhi --trusted-host pypi.douban.com
Collecting alex_sayhi
  Downloading http://pypi.doubanio.com/packages/84/14/b59d93276c86f6ab556cfa7c2d860b742c1611b601cc
4c7743d129b4b52a/alex_sayhi-1.0.0.tar.gz
Installing collected packages: alex-sayhi
  Running setup.py install for alex-sayhi ... done
Successfully installed alex-sayhi-1.0.0
You are using pip version 9.0.3, however version 10.0.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

E:\Python>

E:\Python>pip3 install paramiko
Collecting paramiko
  Downloading https://files.pythonhosted.org/packages/3e/db/cb7b6656e0e7387637ce850689084dc0b9
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Installing collected packages: pyasn1, pycparser, cffi, six, pynacl, bcrypt, asn1crypto, idna,
 cryptography, paramiko
  Running setup.py install for pycparser ... done
Successfully installed asn1crypto-0.24.0 bcrypt-3.1.4 cffi-1.11.5 cryptography-2.3.1 idna-2.7
paramiko-2.4.1 pyasn1-0.4.4 pycparser-2.18 pynacl-1.2.1 six-1.11.0
You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

使用國內豆瓣源下載速度對比：
Microsoft Windows [版本 10.0.17134.285]
(c) 2018 Microsoft Corporation。保留全部權利。

E:\Python>pip3 install -i http://pypi.douban.com/simple/ paramiko
Looking in indexes: http://pypi.douban.com/simple/
Collecting paramiko
  The repository located at pypi.douban.com is not a trusted or secure host and is being
 ignored. If this repository is available via HTTPS we recommend you use HTTPS instead  The repository located at pypi.douban.com is not a trusted or secure host and i
s
being ignored. If this repository is available via HTTPS we recommend you use HTT
PS
 instead, otherwise you may silence this warning and allow it anyway with '--trus
  The repository located at pypi.douban.com is not a trusted or secure host an
d i
s being ignored. If this repository is available via HTTPS we recommend you us
e H
TTPS instead, otherwise you may silence this warning and allow it anyway with
  The repository located at pypi.douban.com is not a trusted or sec
ure
 host and is being ignored. If this repository is available via HTT
PS
we recommend you use HTTPS instead, otherwise you may silence this
war
  The repository located at pypi.douban.com is not a trusted or s
ec
ure host and is being ignored. If this repository is available vi
a
HTTPS we recommend you use HTTPS instead, otherwise you may silen
ce
 this warning and allow it anyway with '--trusted-host pypi.douba
n.
com'.
HTTPS we recommend you use HTTPS instead, otherwise you may si
len
ce this warning and allow it anyway with '--trusted-host pypi.
dou
ban.com'.
HTTPS we recommend you use HTTPS instead, otherwise you may
may silence this warning and allow it anyway with '--tr
ust pypi.douban.com'.
sted-host pypi.douban.com'.
  Could not find a version that satisfies the requireme
 may silence this warning and allow it anyway with
 '--t
rusted-host pypi.douban.com'.
HTTPS we recommend you use HTTPS instead, otherw
is
e you may silence this warning and allow it anyw
ay
 with '--trusted-host pypi.douban.com'.
HTTPS we recommend you use HTTPS instead,
ot
herwise you may silence this warning and a
ll
ow it anyway with '--trusted-host pypi.dou
ba
n.com'.
  Could not find a version that satisfies
herwise you may silence this warning and
a requirement paramiko (from versions: )
llow it anyway with '--trusted-host pypi.
d
ouban.com'.
  Could not find a version that satisfies
the requirement paramiko (from versions:
)ou should consider upgrading via the 'pyt

No matching distribution found for parami
 the requirement paramiko (from versions
:
 )
No matching distribution found for param
  Could not find a version that satisfies the requirement paramiko (from versions:
 )
No matching distribution found for paramiko
You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the 'python -m pip install --upgra
You are using pip version 10.0.1, however version 18.0 is availab
lou should consider upgrading via the 'python -m pip install --upg
You are using pip version 10.0.1, however version 18.0 is avail
ab
You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' comma
You are using pip version 10.0.1, however version 18.0 is availa
b
You are using pip version 10.0.1, however version 18
.0
You are using pip version 10.0.1, however vers
i 18.0 is available.
You are using pip version 10.0.1, however ve
ron 18.0 is available.
You are using pip version 10.0.1, however
version 18.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

E:\Python>pip3 install -i http://pypi.douban.com/simple/ paramiko --trusted-host pypi.douban.com
Looking in indexes: http://pypi.douban.com/simple/
Collecting paramiko
  Downloading http://pypi.doubanio.com/packages/3e/db/cb7b6656e0e7387637ce850689084dc0b94b44df31cc52e5fc5c2c4fd2c1/paramiko-
2.4.1-py2.py3-none-any.whl (194kB)
    100% |████████████████████████████████| 194kB 655kB/s
Requirement already satisfied: pynacl>=1.0.1 in c:\python37\lib\site-packages (from paramiko) (1.2.1)
Requirement already satisfied: pyasn1>=0.1.7 in c:\python37\lib\site-packages (from paramiko) (0.4.4)
Requirement already satisfied: cryptography>=1.5 in c:\python37\lib\site-packages (from paramiko) (2.3.1)
Requirement already satisfied: bcrypt>=3.1.3 in c:\python37\lib\site-packages (from paramiko) (3.1.4)
Requirement already satisfied: cffi>=1.4.1 in c:\python37\lib\site-packages (from pynacl>=1.0.1->paramiko) (1.11.5)
Requirement already satisfied: six in c:\python37\lib\site-packages (from pynacl>=1.0.1->paramiko) (1.11.0)
Requirement already satisfied: idna>=2.1 in c:\python37\lib\site-packages (from cryptography>=1.5->paramiko) (2.7)
Requirement already satisfied: asn1crypto>=0.21.0 in c:\python37\lib\site-packages (from cryptography>=1.5->paramiko) (Requirement already satisfied: idna>=2.1 in c:\python37\lib\site-packages (from cryptography>=1.5->pa
ramiko) (2.7)
Requirement already satisfied: idna>=2.1 in c:\python37\lib\site
-p
ackages (from cryptography>=1.5->paramiko) (2.7)
Requirement already satisfied: asn1crypto>=0.21.0 in c:\python37
\l
ib\site-packages (from cryptography>=1.5->paramiko) (0.24.0)
Requirement already satisfied: pycparser in c:\python37\lib\site
Requirement already satisfied: asn1crypto>=0.21.0 in c:\
plib\site-packages (from cryptography>=1.5->paramiko) (0.24.0)
ython37\lib\site-packages (from cryptography>=1.5->param
ipackages (from cffi>=1.4.1->pynacl>=1.0.1->paramiko) (2.18)
ko) (0.24.0)
Requirement already satisfied: pycparser in c:\python37\
lou are using pip version 10.0.1, however version 18.0 is availa
ib\site-packages (from cffi>=1.4.1->pynacl>=1.0.1->param
iou should consider upgrading via the 'python -m pip install --u
Requirement already satisfied: pycparser
in c:\python37\lib\site-packages (from
 cffi>=1.4.1->pynacl>=1.0.1->paramik
o) (2.18)
Installing collected packages: paramiko
Successfully installed paramiko-2.4.1
You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.