Python日常學習雜記
- python -c 的作用
在命令行裏執行python時，如果加上 -c，即
python -c xxx
那麼，xxx就被當做一條指令（command）來執行，否則，就當做腳本路徑，去找script，然後執行裏面的內容。比如：
$ python 'import this'
/root/anaconda3/bin/python3.7: can't open file 'import this': [Errno 2] No such file or directory
這裏就把這個string作爲路徑去找了，沒有找到文件。如果加上-c的話，就當做一條python命令執行了。
$ python -c 'import this'
The Zen of Python, by Tim Peters
Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!
2019-08-14 16:20:00
- autopep8自動代碼格式修改工具
鏈接：https://pypi.org/project/autopep8/
PEP8是Python的編碼規範。https://www.python.org/dev/peps/pep-0008/
利用autopep8，可以自動將Python腳本整理成符合PEP8規範。
用法
autopep8 --in-place -r --aggressive 文件夾名
options列表如下：
usage: autopep8 [-h] [--version] [-v] [-d] [-i] [--global-config filename]
[--ignore-local-config] [-r] [-j n] [-p n] [-a]
[--experimental] [--exclude globs] [--list-fixes]
[--ignore errors] [--select errors] [--max-line-length n]
[--line-range line line] [--hang-closing] [--exit-code]
[files [files ...]]
Automatically formats Python code to conform to the PEP 8 style guide.
positional arguments:
files files to format or '-' for standard in
optional arguments:
-h, --help show this help message and exit
--version show program's version number and exit
-v, --verbose print verbose messages; multiple -v result in more
verbose messages
-d, --diff print the diff for the fixed source
-i, --in-place make changes to files in place
--global-config filename
path to a global pep8 config file; if this file does
not exist then this is ignored (default:
~/.config/pep8)
--ignore-local-config
don't look for and apply local config files; if not
passed, defaults are updated with any config files in
the project's root directory
-r, --recursive run recursively over directories; must be used with
--in-place or --diff
-j n, --jobs n number of parallel jobs; match CPU count if value is
less than 1
-p n, --pep8-passes n
maximum number of additional pep8 passes (default:
infinite)
-a, --aggressive enable non-whitespace changes; multiple -a result in
more aggressive changes
--experimental enable experimental fixes
--exclude globs exclude file/directory names that match these comma-
separated globs
--list-fixes list codes for fixes; used by --ignore and --select
--ignore errors do not fix these errors/warnings (default:
E226,E24,W50,W690)
--select errors fix only these errors/warnings (e.g. E4,W)
--max-line-length n set maximum allowed line length (default: 79)
--line-range line line, --range line line
only fix errors found within this inclusive range of
line numbers (e.g. 1 99); line numbers are indexed at
1
--hang-closing hang-closing option passed to pycodestyle
--exit-code change to behavior of exit code. default behavior of
return value, 0 is no differences, 1 is error exit.
return 2 when add this option. 2 is exists
differences.
2019-08-26 10:45:14
- 爲文件名添加時間
import datetime
jetzt = str(datetime.date.today())
print(jetzt)
>>> 2019-08-28
可以將日期附到文件名中，便於日後根據時間查找。
2019-08-28 11:24:06