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POpython combine multiple sorted lists into one big sorted list one by one
 

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  1. POpython combine multiple sorted lists into one big sorted list one by one
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    <p>I have several sorted lists, and I want to add them together into one big sorted list. What is the most efficient way to do this?</p> <p>Here is what I would do, but it is too inefficient:</p> <pre><code>big_list=[] for slist in sorted_lists: # sorted_lists is a generator, so lists have to be added one by one big_list.extend(slist) big_list.sort() </code></pre> <p>Here is an example for sorted_lists:</p> <p>The size of sorted_lists =200</p> <p>Size of first element of sorted_lists=1668</p> <pre><code>sorted_lists=[ ['000008.htm_181_0040_0009', '000008.htm_181_0040_0037', '000008.htm_201_0041_0031', '000008.htm_213_0029_0004', '000008.htm_263_0015_0011', '000018.htm_116_0071_0002', '000018.htm_147_0046_0002', '000018.htm_153_0038_0015', '000018.htm_160_0060_0001', '000018.htm_205_0016_0002', '000031.htm_4_0003_0001', '000032.htm_4_0003_0001', '000065.htm_5_0013_0005', '000065.htm_8_0008_0006', '000065.htm_14_0038_0036', '000065.htm_127_0016_0006', '000065.htm_168_0111_0056', '000072.htm_97_0016_0012', '000072.htm_175_0028_0020', '000072.htm_188_0035_0004'….], ['000018.htm_68_0039_0030', '000018.htm_173_0038_0029', '000018.htm_179_0042_0040', '000018.htm_180_0054_0021', '000018.htm_180_0054_0031', '000018.htm_182_0025_0023', '000018.htm_191_0041_0010', '000065.htm_5_0013_0007', '000072.htm_11_0008_0002', '000072.htm_14_0015_0002', '000072.htm_75_0040_0021', '000079.htm_11_0005_0000', '000079.htm_14_0006_0000', '000079.htm_16_0054_0006', '000079.htm_61_0018_0012', '000079.htm_154_0027_0011', '000086.htm_8_0003_0000', '000086.htm_9_0030_0005', '000086.htm_11_0038_0004', '000086.htm_34_0031_0024'….], ['000001.htm_13_0037_0004', '000008.htm_48_0025_0006', '000008.htm_68_0025_0008', '000008.htm_73_0024_0014', '000008.htm_122_0034_0026', '000008.htm_124_0016_0005', '000008.htm_144_0046_0030', '000059.htm_99_0022_0012', '000065.htm_69_0045_0017', '000065.htm_383_0026_0020', '000072.htm_164_0030_0002', '000079.htm_122_0030_0009', '000079.htm_123_0049_0015', '000086.htm_13_0037_0004', '000109.htm_71_0054_0029', '000109.htm_73_0035_0005', '000109.htm_75_0018_0004', '000109.htm_76_0027_0013', '000109.htm_101_0030_0008', '000109.htm_134_0036_0030']] </code></pre> <hr> <p>EDIT</p> <p>Thank you for the answers. I think I should have made it more clear that I do not have the sorted lists simulateneosly but I am iterating over some large files to get them. So, I need to add them one by one, as I am showing in my crude code above.</p>
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    1. COHave a look to this answer :) http://stackoverflow.com/a/1158196/2936488
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      1. POpython combine multiple sorted lists into one big sorted list one by one
      1. USNicolas Brugneaux
    2. COpossible duplicate of [Combining two sorted lists in Python](http://stackoverflow.com/questions/464342/combining-two-sorted-lists-in-python)
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    3. COI don't think it is duplicate, please have a look at the edit
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