How do I convert to list of lists after reading from file in python -
this question has answer here:
i append-writing lists text file through iterations using writelines(str(list)). short, use 2 lists illustrate:
list1=['[#1]:', (4, 8, 16, 29), (4, 8, 16, 30), (4, 8, 16, 32)] list2=['[#2]:', (3, 9, 13, 20), (3, 9, 13, 36), (3, 9, 13, 38)] and in text file, have pile of separate lists:
['[#1]:', (4, 8, 16, 29), (4, 8, 16, 30), (4, 8, 16, 32)] ['[#2]:', (3, 9, 13, 20), (3, 9, 13, 36), (3, 9, 13, 38)] when read text file list using readlines(file.txt), single list of string:
["['[#1]:', (4, 8, 16, 29), (4, 8, 16, 30), (4, 8, 16, 32)], ['[#2]:', (3, 9, 13, 20), (3, 9, 13, 36), (3, 9, 13, 38)]"] this expected. want remove ' " ' (quotation marks) @ beginning , end of list can iterate through list , process list[#1], list[#2] etc. expect elementary can't work out. appreaciate if can show me how.
thanks in advance.
have tried pickle module?
it used object serialization , can dump objects (even lists) file , directly read ease.
example -
import pickle lst1 = [1,2,3,4,5] open('test1.bin','wb') f: pickle.dump(lst1,f) open('test1.bin','rb') f1: lst2 = pickle.load(f1) print(lst2) >> [1,2,3,4,5] for appending can use mode ab . example of appending -
lst2 = [6,7,8,9,10] open('test1.bin','ab') f: pickle.dump(lst2,f) open('test1.bin','rb') f1: lst3 = pickle.load(f1) print(lst3) >> [1,2,3,4,5] lst4 = pickle.load(f1) print(lst4) >> [6,7,8,9,10]
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