Looping through list in Python
<p>I have a problem where I have a double for loop, going through a list of lists.</p>

<p>My problem is that once I get the first list, and am looping through that list, the very last item there isn't an integer, but a list that contains 0L.</p>

<p>The last three items of the list are the following [...15579L, 58L, 198L]</p>

<p>When printing out each element in the list, I get the following:
...
15579
58
198
[0L]</p>

<p>Does anyone know what's going on here and how I can avoid using that extra item?</p>

<p>This is the loop I currently have:</p>

<pre><code>myList1 = [[] for _ in range(accountMax+1)]
myList2 = list(myList1)
# accountMax is roughly 78000
index=0
for items in myList1:
    print('printing list')
    print(items)
    for account in items:
        print('printing account')
        print(account)
        myList2[index].append(myList1[account])
    index = index+1
</code></pre>

<p>This gives the following output of myList1:</p>

<pre><code>printing list
[37L, 30L, 142L, 11L, 82L, 143L, 119L, 203L, 154L, 146L, 188L, 156L, 24L, 72L, 9L, 210L, 53420L, 199L, 183L, 200L, 64L, 5L, 77L, 127L, 28L, 12527L, 101L, 159L, 39L, 33203L, 161L, 42L, 197L, 208L, 187L, 17081L, 98L, 148L, 8511L, 196L, 107L, 14614L, 209L, 73L, 87L, 138L, 145L, 31L, 171L, 212L, 61L, 163L, 16L, 5512L, 158L, 110L, 133L, 124L, 100L, 76L, 204L, 84L, 69L, 150L, 202L, 139L, 192L, 5298L, 129L, 45L, 108L, 147L, 170L, 21L, 67L, 30583L, 7427L, 165L, 4762L, 56L, 29L, 26L, 44L, 181L, 11413L, 166L, 79L, 113L, 169L, 123L, 106L, 213L, 121L, 7L, 33190L, 174L, 94L, 33L, 126L, 17245L, 90L, 167L, 201L, 155L, 38L, 63L, 109L, 71L, 18L, 214L, 132L, 164L, 60L, 50L, 194L, 5280L, 103L, 62L, 8080L, 80L, 180L, 191L, 17000L, 120L, 35L, 178L, 78L, 173L, 86L, 43L, 96L, 14927L, 125L, 10L, 134L, 51L, 49L, 55L, 122L, 95L, 17087L, 207L, 26394L, 89L, 141L, 36L, 168L, 193L, 12L, 65L, 136L, 91L, 179L, 53L, 152L, 131L, 144L, 117L, 116L, 105L, 130L, 149L, 162L, 1611L, 118L, 22L, 114L, 7974L, 15896L, 189L, 172L, 182L, 59L, 88L, 27L, 75L, 13L, 2L, 92L, 14L, 57L, 195L, 32L, 215L, 46L, 112L, 17L, 52L, 74L, 70L, 4L, 54L, 1L, 20L, 83L, 186L, 81L, 19L, 140L, 2629L, 160L, 93L, 85L, 1958L, 102L, 176L, 211L, 184L, 41L, 66L, 3L, 135L, 137L, 205L, 25L, 104L, 8L, 157L,     185L, 47L, 206L, 34L, 8048L, 48L, 111L, 151L, 6L, 99L, 97L, 23L, 190L, 68L,     153L, 115L, 177L, 128L, 40L, 175L, 15L, 15579L, 58L, 198L]
</code></pre>

<p>And printing account gives the following:</p>

<pre><code>printing account
15
printing account
15579
printing account
58
printing account
198
printing account
[0L]
</code></pre>