Python: How to input numbers in list between two numbers based on user input?

Question

start = int(input("Enter starting number: "))
stop = int(input("Enter number to stop viewing at: "))
numbers = [start:stop]

This gives me a syntax error. I can't even use numbers.append[start:stop] Any way I can use something like list slicing to input numbers into a list?

The first syntax error is probably from this line: stop = int(input(Enter number to stop viewing at: ")) You're missing a quotation. — Farhan.K
– Farhan.K, Commented May 27, 2016 at 9:23
@glls yes, also if i could put in floats (at a rounded of 2 digits), that's be great — Neel Kamath
– Neel Kamath, Commented May 27, 2016 at 9:32
@Farhan.K oh sorry, I forgot that in the question, it's written correctly in the actual code. — Neel Kamath
– Neel Kamath, Commented May 27, 2016 at 9:33
you can, view the below info, it is pretty straightforward on pythons documentation — glls
– glls, Commented May 27, 2016 at 9:37

Farhan.K · Accepted Answer · 2016-05-27 09:20:19Z

1

That is not the correct way to generate a list. If you want a list of numbers based on input you can use this:

start = int(input("Enter starting number: "))
stop = int(input("Enter number to stop viewing at: "))
numbers = [i for i in range(start,stop+1)]

You might want to read up on lists and range.

answered May 27, 2016 at 9:20

Farhan.K

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3 Comments

Matthias Over a year ago

[i for i in range(start,stop+1)] is a complicated way to write list(range(start, stop + 1)).

Farhan.K Over a year ago

@Matthias I wouldn't say it's complicated. It's basic list comprehension.

Matthias Over a year ago

You're right, a list comprehension isn't exactly rocket science, but nevertheless it's more complicated than just using a call to list.

glls · Accepted Answer · 2016-05-27 09:36:06Z

0

if my comment is the case, you can append items in your list, based on range as follows:

start = int(input("Enter starting number: "))
stop = int(input("Enter number to stop viewing at: "))
numbers=[]
for i in range(start, stop+1):
    numbers.append(i)

print list

for rounding digits:

round(number[, ndigits])

Return the floating point value number rounded to ndigits digits after the decimal point. If ndigits is omitted, it defaults to zero. The result is a floating point number. Values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done away from 0 (so, for example, round(0.5) is 1.0 and round(-0.5) is -1.0).

from python orgs documentation.

edited May 27, 2016 at 9:36

answered May 27, 2016 at 9:18

glls

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1 Comment

ssm Over a year ago

or just, numbers = range(start, stop+1). Its better not to change the definition of list which is a keyword. I didnt notice that this is 3.x. Here, numbers = list(range(start, stop+1)) may be useful ...

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