technofriends

# zipping and unzipping of two lists

list1 = ['a','b','c']
list2 = [20,100,2000]
# zip the two lists together
pairs =  zip(list1,list2)
print pairs
# [('a', 20), ('b', 100), ('c', 2000)]

# unzipping the list 

technofriends

# Python 3.3+ has a std
# lib module for displaying
# tracebacks even when Python
# "dies", e.g with a segfault:

import faulthandler
faulthandler.enable()

# Can also be enabled with
# "python -X faulthandler"

technofriends

# You can get the name of
# an object's class as a
# string:

>>> class MyClass: pass

>>> obj = MyClass()
>>> obj.__class__.__name__
'MyClass'

technofriends

kp = 1.2
ki = 0.9
kd = 0.3

set_point = 50
prev_error = 0
cumulative_moving_average = 0
iteration = 0

def make_iteration(measured):

technofriends

# Different ways to test multiple
# flags at once in Python
x, y, z = 0, 1, 0

if x == 1 or y == 1 or z == 1:
    print('passed')

if 1 in (x, y, z):
    print('passed')

technofriends

# Python has a HTTP server built into the
# standard library. This is super handy for
# previewing websites.

# Python 3.x
$ python3 -m http.server

# Python 2.x
$ python -m SimpleHTTPServer 8000

technofriends

def is_non_zero_file(base_filename):  
    wk_dir = os.path.dirname(os.path.realpath('__file__'))
    fpath = os.path.join(wk_dir, base_filename)
    print fpath
    return os.path.isfile(fpath) and os.path.getsize(fpath) > 0

technofriends

import math
PI = math.pi
def compute_bearing(p, q):
    x1, y1 = p
    x2, y2 = q

    dx = x2 - x1
    dy = y2 - y1

    return truncate_angle(math.atan2(dy, dx))

technofriends

import math
def compute_distance(p, q):
    x1, y1 = p
    x2, y2 = q

    dx = x2 - x1
    dy = y2 - y1

    return math.sqrt(dx**2 + dy**2)

technofriends

# ab -n <number-of-requests> -h "User-Agent: <user-agent>" <url>

# send 100 requests to example.com and change the User Agent to foobar/1.0

ab -n 100 -H "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36
" http://example.com/somepath/somefile.xyz

# send 10 concurrent requests to example.com at the specific IP

ab -n 10 -c 10 -H "Host: example.com" http://192.168.1.1/