Python: reading from two separate lines, creating two lists

Question

I am reading from a txt file: (it is formatted exactly like below)

(+1 +2 +3 +4)

(-4 -9)(-3 -6 -7)

My desired output is to have two (integer) lists

Both BEFORE the \\n and AFTER.

Example:

BEFORE_LIST = [1,2,3,4] 

AFTER_LIST = [[-4,-9] , [-3, -6, -7]]

I can not figure out the correct combination of splits and strips to make this happen.

Any help I am very grateful.

Answer 1

listOfValues = (x.split(' ')for x in (val.replace(')','') for val in input().split('(')))
listOfIntegers = list(filter(None, [[int(value) for value in values if isInt(value)]for values in listOfValues]))

print(listOfIntegers)

The is isInt method can be defined as:

def isInt(s):
    try:
        int(s)
        return True
    except:
        return False

Or a more elaborate solution that avoids the exception:

def isInt(s):
    return s.replace('+').replace('-').isdecimal() // doesn't cover all cases 

This doesn't checks for invalid input format (For eg unmatched paranthesis).

Answer 2

Will it do?

import re
from ast import literal_eval
with open('test','r') as f:
    for line in f:
        line = line.replace(' ',',').replace('+','')
        my_list = re.findall(r'\(.+?\)',line)
        result = [list(literal_eval(i)) for i in my_list]
        if len(result)==1:
            result = [i for term in result for i in term ]

        print result

Output:

[1, 2, 3, 4]
[[-4, -9], [-3, -6, -7]]