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# Python code challenge problem.

I've done what the question asked for but it keeps saying task 1 is no longer correct during task 3 while I meet the requirement for task 1. Am I missing something here? Also, how do I make the task 2 simpler than what I wrote?

lists.py
```the_list = ["a", 2, 3, 1, False, [1, 2, 3]]

# Your code goes below here
# Move element 1 to index 0
target = the_list.pop(the_list.index(1))
the_list.insert(0, target)

# remove boolean, string, list in the_list
not_int = []
for item in the_list:
if type(item) is not int:
not_int.append(item)

for item in not_int:
the_list.remove(item)

# let the_list have only numbers 1 ~ 20 by using extend()
the_list.extend(list(range(the_list[-1], 21)))
```

I probably was overthinking it to make it somewhat useful and make use of what I learned from Python doc but yeah that works for sure. I was just curious how my answer altered the task 1.

I'm not sure why it makes task 1 fail. The output of both had the same result in the python shell. I did notice that both were adding an extra '3' into the list. I corrected it with the 3rd one by adding + 1

test = [1,2,3] test.extend(list(range(test[-1], 21))) print(test) [1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] test = [1,2,3] test.extend(list(range(len(test), 21))) print(test) [1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] test = [1,2,3] test.extend(range(len(test) + 1, 21)) print(test) [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]

When an earlier task starts failing it is usually caused by a syntax error in the current task which makes all the tasks fail due to the syntax error.