Remove string quotes from array in Python

Question

I'm trying to get rid of some characters in my array so I'm just left with the x and y coordinates, separated by a comma as follows:

[[316705.77017187304,790526.7469308273]
 [321731.20991025254,790958.3493565321]]

I have used zip() to create a tuple of the x and y values (as pairs from a list of strings), which I've then converted to an array using numpy. The array currently looks like this:

[['316705.77017187304,' '790526.7469308273,']
 ['321731.20991025254,' '790958.3493565321,']]

I need the output to be an array.

I'm pretty stumped about how to get rid of the single quotes and the second comma. I have read that map() can change string to numeric but I can't get it to work.

Thanks in advance

Yes it is. Just had a thought, do I need to convert the strings to numbers before adding them to the tuple? Thanks — hansolo
– hansolo, Commented Jan 25, 2014 at 15:02
I am not very sure check my answer below.. may be helpful for you else I will delete. — Grijesh Chauhan
– Grijesh Chauhan, Commented Jan 25, 2014 at 15:11
I have read that map() can change string to numeric not actually... — Grijesh Chauhan
– Grijesh Chauhan, Commented Jan 25, 2014 at 15:22

Grijesh Chauhan · Accepted Answer · 2014-01-25 16:08:17Z

1

Using 31.2. ast — Abstract Syntax Trees¶

import ast
xll =  [['321731.20991025254,' '790958.3493565321,'], ['321731.20991025254,' '790958.3493565321,']]
>>> [ast.literal_eval(xl[0]) for xl in xll]
[(321731.20991025254, 790958.3493565321), (321731.20991025254, 790958.3493565321)]

Above gives list of tuples for list of list, type following:

>>> [list(ast.literal_eval(xl[0])) for xl in xll]
[[321731.20991025254, 790958.3493565321], [321731.20991025254, 790958.3493565321]]

OLD: I think this:

>>> sll
[['316705.770172', '790526.746931'], ['321731.20991', '790958.349357']]
>>> fll = [[float(i) for i in l] for l in sll]
>>> fll
[[316705.770172, 790526.746931], [321731.20991, 790958.349357]]
>>>

old Edit:

>>> xll =  [['321731.20991025254,' '790958.3493565321,'], ['321731.20991025254,' '790958.3493565321,']]
>>> [[float(s) for s in xl[0].split(',') if s.strip() != ''] for xl in xll]
[[321731.20991025254, 790958.3493565321], [321731.20991025254, 790958.3493565321]]

edited Jan 25, 2014 at 16:08

answered Jan 25, 2014 at 14:55

Grijesh Chauhan

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2 Comments

hansolo Over a year ago

Once I removed the commas from the original strings, your "OLD" answer seems to have done the trick. Brilliant, thank you!

Grijesh Chauhan Over a year ago

@user2727152 Try: [[float(s) for s in xl[0].split(',') if s.strip() != ''] for xl in xll] to remove , and convert into float in one step.

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