Python hacks

__ Python tricks .txt

little tricks on python::::::

_except.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# https://stackoverflow.com/a/4990739/8747302

""" catch them all! """

import time, sys
''' catch all ecxeption info in sys.exc_info() '''

try:
    time.sleep(5) # ^+C
    raise Exception('some except')
except:
    print "Unexpected error:", sys.exc_info()[0]
    raise

class_decorator_method.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# https://stackoverflow.com/questions/3001138/python-decorators-and-inheritance
# https://habr.com/post/141501/

""" decorator vith args """

class Printer(object):
    def write(self, s):
        print s

    def close(self):
        print "closed"


class bar(object):
    def __init__(self):
        self.shape = 'box'
        self.p = Printer()

    def set_shape(self, shape):
        self.val = str(shape)

    @staticmethod
    def decor(func):
        def increment(self,  *args, **kwargs):
            self.p.write("start")
            a = func(self,  *args, **kwargs)
            self.p.close()
            return a
        return increment


class foo(bar):
    # def __init__(self):
    #     bar.__init__(self)

    @bar.decor
    def add(self, shape, color):
        self.shape = shape
        print color, self.shape


a = foo()
a.add('circle', color='Yellow')

clear_color.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

# https://stackoverflow.com/questions/14693701/how-can-i-remove-the-ansi-escape-sequences-from-a-string-in-python

import re

ansi_escape = re.compile(r'\x1B\[[0-?]*[ -/]*[@-~]')
ansi_escape.sub('', sometext)

sometext = 'ls\r\n\x1b[00m\x1b[01;31mexamplefile.zip\x1b[00m\r\n\x1b[01;31m'
ansi_escape.sub('', sometext)
# 'ls\r\nexamplefile.zip\r\n'

list_to_args.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# https://stackoverflow.com/questions/3941517/converting-list-to-args-when-calling-function
# https://docs.python.org/2/reference/expressions.html#calls

def a(*args):
    for i in args:
        print i

x = (1, 2, 3, 4)
y = ()

a(x)
# >> (1, 2, 3, 4)
a(y)
# >> ()

a(*x)    # Symbhol *
# >> 1
#... 2
#... 3
#... 4

a(*y)
# >> nothing return

markdown_to_html.md

convert md to html with python

sudo pip install markdown --proxy="192.168.172.129:3128"
sudo pip install Pygments --proxy="192.168.172.129:3128"
pygmentize -S default -f html -a .codehilite > style.css
python -m markdown -x codehilite -x extra sbc_manual.md | ./add_style.py; firefox out.html

https://gist.github.com/andyferra/2554919 http://sebastianraschka.com/Articles/2014_markdown_syntax_color.html https://biscuitsandtea.herokuapp.com/posts/markdown https://python-markdown.github.io/ https://python-markdown.github.io/cli/ https://python-markdown.github.io/extensions/code_hilite/

py_threading.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# https://stackoverflow.com/questions/323972/is-there-any-way-to-kill-a-thread-in-python

""" Stop Event on thread """

import threading

class StoppableThread(threading.Thread):
    """Thread class with a stop() method. The thread itself has to check
    regularly for the stopped() condition."""

    def __init__(self):
        super(StoppableThread, self).__init__()
        self._stop_event = threading.Event()

    def stop(self):
        self._stop_event.set()

    def stopped(self):
        return self._stop_event.is_set()

time_execute.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

# https://stackoverflow.com/questions/1557571/how-do-i-get-time-of-a-python-programs-execution

""" How long exec """

import time
def timer(f):
  start_time = time.time()
  f()
  print("--- %s sec." % (time.time() - start_time))

замер времени выполнения

from timeit import timeit
print(round(timeit("s = '; '.join(str(x) for x in range(10 ** 7))", number=10), 3))