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Python

File

Class & Function

import os
import inspect

def foo():
  pass

print(os.path.abspath(inspect.getfile(foo)))

class Bar:
  pass

print(os.path.abspath(inspect.getfile(Bar.__class__)))

Modules & Packages

import pkgutil
search_path = ["."] # set to None to see all modules importable from sys.path
all_modules = [x[1] for x in pkgutil.iter_modules(path=search_path)]
print(all_modules)

Celery

kill -9 $(ps aux | grep celery | grep -v grep | awk '{print $2}' | tr '\n' ' ') > /dev/null 2>&1

celery -A <worker name: karestoon> worker --loglevel=info

PIP

pip install file:///path/to/package

Operators

  • The "i" symbol means "in place"
  • The "a" symbol means "asynchronous"
  • The "r" symbol means "reverse"
  • When we are implementing the "Rich comparison" method we should return a new object, in the other hand for the "Augmented assignment arithmetic" method we should update the current object

Other

  • Growth rates of common functions measured in nanoseconds:
n lg n n n lg n n² 2ⁿ n!
10 0.003 μs 0.01 μs 0.033 μs 0.1 μs 1 μs 3.63 ms
20 0.004 μs 0.02 μs 0.086 μs 0.4 μs 1 ms 77.1 years
30 0.005 μs 0.03 μs 0.147 μs 0.9 μs 1 sec 8.4 × 10¹⁵ yrs
40 0.005 μs 0.04 μs 0.213 μs 1.6 μs 18.3 min
50 0.006 μs 0.05 μs 0.282 μs 2.5 μs 13 days
100 0.007 μs 0.1 μs 0.644 μs 10 μs 4 × 10¹³ yrs
1,000 0.010 μs 1.00 μs 9.966 μs 1 ms
10,000 0.013 μs 10 μs 130 μs 100 ms
100,000 0.017 μs 0.10 ms 1.67 ms 10 sec
1,000,000 0.020 μs 1 ms 19.93 ms 16.7 min
10,000,000 0.023 μs 0.01 sec 0.23 sec 1.16 days
100,000,000 0.027 μs 0.10 sec 2.66 sec 115.7 days
1,000,000,000 0.030 μs 1 sec 29.90 sec 31.7 years
  • cProfile example: