https://book.pythontips.com/en/latest/index.html

args and kwargs

Already know this but can be useful to define functions to patch code at runtime, which could see as being useful for debugging.

import someclass

def get_info(self, *args):
    return "Test data"

someclass.get_info = get_info

Debugging

import pdb

 def make_bread(arg):
     pdb.set_trace()
     return "I don't have time" + arg

 print(make_bread(" and money"))

Pretty simple, enter with pdb.set_trace() or python -m pdb myscript.py.

Visibility

• w: view current line
• a: view args
• l: view code
• ll: view code
• b: list all breaks
• p, pp, display: print an expression!
• w: view the current stack

Movement

• c: continue
• n, s: next line

Generators

Map, Filter and Reduce

Map and filter are commonly used, reduced less so. What other ones might be more interesting.

from functools import reduce
 a = [1,2,3,4]
 b = reduce((lambda x,y: x + y), a)
 print("{} {}".format(a,b))

Ternaries

Huh shorthand ternaries are kinda like nullish coalescing.

output or "something"

One liners

Thats pretty neat, can host a quick http server with python

# Python 2
python -m SimpleHTTPServer

# Python 3
python -m http.server

# Can also profile with
python -m cProfile script.py

Context managers

Simple RAII style classes. Just implement the enter and exit functions.

class File(object):
    def __init__(self, file_name, method):
        self.file_obj = open(file_name, method)
    def __enter__(self):
        return self.file_obj
    def __exit__(self, type, value, traceback):
        self.file_obj.close()