How to add a dot in python list

Question

How do I add a dot into a Python list?

For example

 groups = [0.122, 0.1212, 0.2112]

If I want to output this data, how would I make it so it is like

122, 1212, 2112

I tried write(groups...[0]) and further research but didn't get far. Thanks.

Thankyou

You mean you want to find the decimal portion of the floating point numbers in your list? — Martijn Pieters, Apr 08 '14 at 13:05
@user3511074 Then you should edit your question to make it more accurate and descriptive... And while you're on it, take a look to this: http://stackoverflow.com/questions/3886402/python-how-to-get-numbers-after-decimal-point — Savir, Apr 08 '14 at 13:08

score 2 · Answer 1 · 2014-04-08T13:25:23.863

2

[str(g).split(".")[1] for g in groups]

results in

['122', '1212', '2112']

Edit:

Use it like this:

groups = [0.122, 0.1212, 0.2112]
decimals = [str(g).split(".")[1] for g in groups]

edited Apr 08 '14 at 13:25

answered Apr 08 '14 at 13:08

1

@PascalvKooten True, but there aren't any in the question. – Apr 08 '14 at 13:12
Sorry to sound stupid but where would I put this in my overall code? – user3511074 Apr 08 '14 at 13:15
IndexError: list index out of range – user3511074 Apr 08 '14 at 13:39
So yea, you most likely have a number which does not have a decimal point in it. It will also ignore anything *before* the decimals... – PascalVKooten Apr 08 '14 at 13:44
@user3511074 Please edit your question to include a sample of all the possible input data. Then I can extend my answer to work for all kind of input. – Apr 08 '14 at 18:41

score 0 · Answer 2 · edited Jun 20 '20 at 09:12

0

This should do it:

groups = [0.122, 0.1212, 0.2112]
import re
groups_str = ", ".join([str(x) for x in groups])
re.sub('[0-9]*[.]', "", groups_str)

[str(x) for x in groups] will make strings of the items.
", ".join will connect the items, as a string.

import re allows you to replace regular expressions:

using re.sub, the regular expression is used by replacing any numbers followed by a dot by nothing.

EDIT (no extra modules):

Working with Lutz' answer, this will also work in the case there is an integer (no dot):

decimals = [str(g).split("0.") for g in groups]
decimals = decimals = [i for x in decimals for i in x if i != '']

It won't work though when you have numbers like 11.11, where there is a part you don't want to ignore in front of the dot.

edited Jun 20 '20 at 09:12

Community

1
1

answered Apr 08 '14 at 13:07

PascalVKooten

20,643
17
103
160

It's not even a string. – Martijn Pieters Apr 08 '14 at 13:08
I don't know, regex sounds like an overkill here. My vote goes to Lutz – Dunno Apr 08 '14 at 13:09
I am "not allowed" to import from anything other than Turtle. – user3511074 Apr 08 '14 at 13:10
Lutz has a much better answer given all items are floats! – PascalVKooten Apr 08 '14 at 13:10
@user3511074 This might bring you closer to your goal. – PascalVKooten Apr 08 '14 at 13:51

score 0 · Answer 3 · answered Apr 08 '14 at 13:10

0

You could use a list comprehension and return a list of strings

groups = [0.122, 0.1212, 0.2112]
[str(x).split(".")[1] for x in groups]

Result

['122', '1212', '2112']

The list comprehension is doing the following:

Turn each list element into a string

Split the string about the "." character

Return the substring to the right of the split

Return a list based on the above logic

answered Apr 08 '14 at 13:10

Cory Kramer

114,268
16
167
218

Seems like copying Lutz' answer? – PascalVKooten Apr 08 '14 at 13:12
@PascalvKooten ... I always seem to be a day late and a dollar short on this site! By the time I finish typing and formatting my answer, people tend to beat me to the point. – Cory Kramer Apr 08 '14 at 13:13
The general advice is to upload an answer that is correct, and then edit it to add the explanation. Might help you! – PascalVKooten Apr 08 '14 at 13:14

How to add a dot in python list

3 Answers3

EDIT (no extra modules):