I have a python string in the following format:
"x1 y1\n x2 y2\n x3 y3\n ..."
I would like to transform this into a list points = [p1, p2, p3,...], where p1, p2 and p3 are [x1,y1], [x2,y2] and [x3,y3] etc.
Thanks
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3Are you able to provide your code attempts so we have a place to start?George Cummins– George Cummins2011-06-30 15:25:39 +00:00Commented Jun 30, 2011 at 15:25
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for now my code is to read in the ouput from a bash command. the command is : rbox 100 D2, this produces the coordinates of 100 random points. now i'm stuck in formatting these ouputs. i use python subprocess to get the ouputMcBear Holden– McBear Holden2011-06-30 15:26:47 +00:00Commented Jun 30, 2011 at 15:26
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Then this might be a good place to start learning about string operations such as parsing: docs.python.org/library/string.htmlGeorge Cummins– George Cummins2011-06-30 15:28:43 +00:00Commented Jun 30, 2011 at 15:28
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5 Answers
Think you can use the following:
inputText = "x1 y1\n x2 y2\n x3 y3\n"
print [line.split() for line in inputText.split('\n') if line]
1 Comment
matchew
oh, so you seem to have beaten me to this... by 3mins. +1
obviously, many ways to do this.
I would use list comprehension for its brevitiy.
>>> str = 'x1 y1\n x2 y2\n x3 y3\n'
>>> [p.split() for p in str.split('\n') if p != '']
[['x1', 'y1'], ['x2', 'y2'], ['x3', 'y3']]
2 Comments
McBear Holden
i'm totally overwhelmed by the quality and speed of the answers from stackoverflow... Thanks everyone
matchew
hah, yeah, I never do. but I'm not to creative when answering questions sometimes. I was trying to make this as logical and concise as possible.
points = []
for point in myStr.split('\n'):
points.append(point.split())
Comments
a='x1 y1\n x2 y2\n x3 y3\n'
points = map (lambda x : x.split (), a.split ('\n'))
Comments
Would this do?
>>> raw = "x1 y1\nx2 y2\nx3 y3"
>>> lines = raw.split("\n")
>>> points = []
>>> for l in lines:
... points.append(l.split(' '))
...
>>> points
[['x1', 'y1'], ['x2', 'y2'], ['x3', 'y3']]
>>>
Split on new lines, then for each line assume a space splits the values, create a list of points from that.
