Python - re.split string

Question

I've been searching for a solution for a few hours now. I have a variable I want to split up in a nested list.

points ="""M445,346c28.8,0,56,11.2,76.4,31.6C541.8,398,553,425.2,553,454s-11.2,56-31.6,76.4C501,550.8,473.8,562,445,562
        s-56-11.2-76.4-31.6C348.2,510,337,482.8,337,454s11.2-56,31.6-76.4S416.2,346,445,346 M445,345c-60.2,0-109,48.8-109,109
        s48.8,109,109,109s109-48.8,109-109S505.2,345,445,345L445,345z"""

newPoints = re.split(r'[A-Za-z-]', points)

It is a multiline var with x and y positions of points from a svg file.

The pattern is that it starts a new item at a letter. I would like to have it ordered something like the following. I've tried some options like above. One of the mail problems is that it keeps deleting my delimiter. :)

[ 
  [ 
     [command],
     [x of p1, y of p1],
     [x of p2, y of p2], 
     [x of p3, y of p3] 
  ] 
]

[ 
[ [M],[445,346] ],
[ [c],[28.8,0],[56,11.2],[76.4,31.6] ]
]

Any pointers are very welcome!

Ajax1234 · Accepted Answer · 2018-03-25 15:21:21Z

2

You can find letters and floats, and then group:

import re
import itertools
points ="""M445,346c28.8,0,56,11.2,76.4,31.6C541.8,398,553,425.2,553,454s-11.2,56-31.6,76.4C501,550.8,473.8,562,445,562
    s-56-11.2-76.4-31.6C348.2,510,337,482.8,337,454s11.2-56,31.6-76.4S416.2,346,445,346 M445,345c-60.2,0-109,48.8-109,109
    s48.8,109,109,109s109-48.8,109-109S505.2,345,445,345L445,345z"""
new_points = [list(b) for a, b in itertools.groupby(filter(None, re.findall('[a-zA-Z]+|[\d\.]+', points)), key=lambda x:re.findall('[a-zA-Z]+', x))]
final_data = [[new_points[i], [int(c) if re.findall('^\d+$', c) else float(c) for c in new_points[i+1]]] for i in range(0, len(new_points)-1, 2)]

Output:

[[['M'], [445, 346]], [['c'], [28.8, 0, 56, 11.2, 76.4, 31.6]], [['C'], [541.8, 398, 553, 425.2, 553, 454]], [['s'], [11.2, 56, 31.6, 76.4]], [['C'], [501, 550.8, 473.8, 562, 445, 562]], [['s'], [56, 11.2, 76.4, 31.6]], [['C'], [348.2, 510, 337, 482.8, 337, 454]], [['s'], [11.2, 56, 31.6, 76.4]], [['S'], [416.2, 346, 445, 346]], [['M'], [445, 345]], [['c'], [60.2, 0, 109, 48.8, 109, 109]], [['s'], [48.8, 109, 109, 109]], [['s'], [109, 48.8, 109, 109]], [['S'], [505.2, 345, 445, 345]], [['L'], [445, 345]]]

edited Mar 25, 2018 at 15:21

answered Mar 25, 2018 at 14:52

Ajax1234

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2 Comments

Tim Over a year ago

Woah! thanks! That did the trick! I've changes the "final_data" part. It left out the last (odd) value. I've changed it to: final_data = [] for i in range(0, len(new_points),2): try: if new_points[i+1]: final_data.append([new_points[i], new_points[i+1]]) except IndexError: final_data.append([new_points[i]])

Ajax1234 Over a year ago

@Tim Glad to help!

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