python_memory.md

A reference on small Python stuffs

Various lil' things

• See Difference in for key in d.keys() and for key in d
• On underscores in Python
• Assigning more vars to same value
• Various ways, different in speed and in preserving the order, to uniquify a list: here and a followup with another suggestion (f7) here
• Various ways, with time benchmarks, to check if key is in dict, here

See where the Python packages are installed

import site
site.getsitepackages()

Update a dictionary without using try except if key not there

d[k] = d.get(k, 0) + 1

Sort a dict by key or value

You get a sorted representation, the dict is not actually sorted

s = sorted(d.items(), key=operator.itemgetter(0))

This gives list of tuples sorted by key.

Find the max of list of tuples by second arg

max(day_numtweets, key=lambda x: x[1])