Python日常學習雜記
- python -c 的作用
在命令行里執行python時，如果加上
-c
，即
python -c xxx
那么，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，然后執行里面的內容。比如：
$ python
'import this'
/root/anaconda3/bin/python3.7: can
't open file '
import
this':
[
Errno 2
]
No such
file
or directory
這里就把這個string作為路徑去找了，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的編碼規范。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規范。
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
- 為文件名添加時間
import
datetime
jetzt
=
str
(
datetime.date.today
(
))
print
(
jetzt
)
>>
>
2019-08-28
可以將日期附到文件名中，便于日后根據時間查找。
2019-08-28 11:24:06
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