ftfarias

import re
DOUBLE_SPACES_REMOVER = re.compile(r'[ ]+')

def remove_double_spaces_re(text):
    return DOUBLE_SPACES_REMOVER.sub(' ',text)

%timeit remove_double_spaces_re('ads   sadf   scbvcxb  ret h fdgh jj gh  erty  ')
4.3 µs ± 62.2 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

############################

ftfarias

When are Python circular imports fatal?

In your Python package, you have:

• an __init__.py that designates this as a Python package
• a module_a.py, containing a function action_a() that references an attribute (like a function or variable) in module_b.py, and
• a module_b.py, containing a function action_b() that references an attribute (like a function or variable) in module_a.py.

This situation can introduce a circular import error: module_a attempts to import module_b, but can't, because module_b needs to import module_a, which is in the process of being interpreted.

But, sometimes Python is magic, and code that looks like it should cause this circular import error works just fine!

ftfarias

import re
DATA = "Hey, you - what are you doing here!?"
print re.findall(r"[\w']+", DATA)
# Prints ['Hey', 'you', 'what', 'are', 'you', 'doing', 'here']


>>> re.split('\W+', 'Words, words, words.')
['Words', 'words', 'words', '']

>>> re.split('(\W+)', 'Words, words, words.')

ftfarias

# from tqdm import tqdm
import csv

with open('source.csv', 'r', encoding='utf-8', errors='replace') as input_file:
    # protects from "null" bytes
    input_file = (l.replace('\0' ,'') for l in input_file)
    input_csv = csv.reader(input_file, delimiter=';', quotechar='"')

    # remove header if necessary
    header = next(input_csv)