Text File Integer import error

Question

I just can't seem to solve this. I know others use this exact code and it works for them; why would I get an error and others not? I use Python 3.6.3

with open('Numbers.txt') as f:
    alist = [int(num) for num in f]

print(alist[0])
print(alist[99999])
print(alist())

Output:

54044
91901
Traceback (most recent call last):
  File "test3.py", line 8, in <module>
    print(alist())
TypeError: 'list' object is not callable

Also did below with the same error:

with open('Numbers.txt') as f:
    numbers = f.readlines()

numbers = [int(x.strip()) for x in numbers]

print(numbers[0])
print(len(numbers()))

"I know others use this exact code and it works for them". Are you 100% sure about that? Do you have a link? — Kevin
– Kevin, Commented Nov 3, 2017 at 17:33
coursera.org/learn/algorithms-divide-conquer/discussions/all/… — Reuben
– Reuben, Commented Nov 3, 2017 at 17:40
I'm expecting to see a list of 100000 integers. I want to use it in a Sort algorithm. The algorithm works with test array inputs, but not with this list. — Reuben
– Reuben, Commented Nov 3, 2017 at 17:42

Sebastian Mendez · Accepted Answer · 2017-11-03 17:34:02Z

3

You're calling the list on line 8, see alist(). Lists aren't callable. If you want the full list, just do alist.

answered Nov 3, 2017 at 17:34

Sebastian Mendez

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Prune · Accepted Answer · 2017-11-03 17:34:09Z

0

Your syntax is invalid. You used parentheses instead of brackets.

alist()

Is not a valid use; the parentheses signal to the parser that you want to use alist as a function. What do you want this to do?

The second one has the same problem. For that, I think you just want the name without parentheses:

print (len(numbers))

answered Nov 3, 2017 at 17:34

Prune

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1 Comment

Reuben Over a year ago

Thanks, I'm embarrassed, should have picked that up.

Van Peer · Accepted Answer · 2017-11-16 06:54:32Z

0

In Python, () indicates that you want to call or execute something, a function for example. You were trying to call numbers by numbers() in the last line, which is a list, not a function. Change it to numbers to get the length of the list numbers.

with open('Numbers.txt') as f:
    numbers = f.readlines()

numbers = [int(x.strip()) for x in numbers]

print(numbers[0])
print(len(numbers))

edited Nov 16, 2017 at 6:54

answered Nov 3, 2017 at 17:35

Van Peer

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1 Comment

Heri Over a year ago

Please explain what/how your contribution solves the OPs question.

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