Styjun

Draw a checker pattern with a black X in the center

Can a wire having a 610-670 THz (frequency of blue light) AC frequency supply, generate blue light?

What does "tea juice" mean in this context?

How can I grammatically understand "Wir über uns"?

Biblical Basis for 400 years of silence between old and new testament

The deliberate use of misleading terminology

Adding strings in lists together

What does "Marchentalender" on the front of a postcard mean?

What are the slash markings on Gatwick's 08R/26L?

Humans meet a distant alien species. How do they standardize? - Units of Measure

Can an old DSLR be upgraded to match modern smartphone image quality

How to detach yourself from a character you're going to kill?

Self-Preservation: How to DM NPCs that Love Living?

60s (or earlier) short story where each colony has one person who doesn't connect well with others who is there for being able to absorb knowledge

Why does the UK have more political parties than the US?

Is a hash a zero-knowledge proof?

What's the most polite way to tell a manager "shut up and let me work"?

Is there an evolutionary advantage to having two heads?

Why do Russians call their women expensive ("дорогая")?

Uncommanded roll at high speed

What caused the tendency for conservatives to not support climate change regulations?

What does the behaviour of water on the skin of an aircraft in flight tell us?

Do creatures all have the same statistics upon being reanimated via the Animate Dead spell?

Can't connect to Internet in bash using Mac OS

How to turn text file into python list form

How can I check the version of sed in OS X?How do I check if a list is empty?How do I check whether a file exists without exceptions?Finding the index of an item given a list containing it in PythonWhat is the difference between Python's list methods append and extend?Getting the last element of a list in PythonHow to make a flat list out of list of listsHow do I get the number of elements in a list in Python?How do I concatenate two lists in Python?How to clone or copy a list?How do I list all files of a directory?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;

0

1

I'm trying to turn a list of numbers in a text file into python list form. For example, I want to make

1
2
3
4
5

into

[1,2,3,4,5]

I found something that almost worked in another post using sed.

sed '1s/^/[/;$!s/$/,/;$s/$/]/' file

but this didn't remove the new line after every number. How can I modify this sed command to get it to do what I want. Also, an explanation on the components of the sed command would also be appreciated. Thanks

python list sed

share|improve this question

asked Mar 23 at 15:17

Joshua SegalJoshua Segal

62

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  with open('file') as f:..data = f.read().strip().split();..nums = map(int, data) ? Why are you using sed here ?
  
  – han solo
  Mar 23 at 15:18
  
  

  
  
  
  


• 
  
  
  

  
  8
  

  
  
  
  
  
  

  
  
  Are you wanting to do this in Python or is this primarily a question on sed and you're just referencing Python because of the format? If the later - you don't need anything except the sed tag... and if the former - you'd don't need the sed tag... Please considering making an edit to your post to clarify that - thanks.
  
  – Jon Clements♦
  Mar 23 at 15:21
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Just in case you need it for some out of python operation awk 'BEGINRS=ORS="";OFS="," ;printf "[" $1=$1;print ENDprint "]n"' file
  
  – PS.
  Mar 23 at 15:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Append | tr -d 'n'?
  
  – Cyrus
  Mar 23 at 15:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you @Cyrus. That's a pretty good command line answer. You should make it an actual answer
  
  – Joshua Segal
  Mar 23 at 21:00
  
  

  
  
  
  

 | 
show 1 more comment

0

1

I'm trying to turn a list of numbers in a text file into python list form. For example, I want to make

1
2
3
4
5

into

[1,2,3,4,5]

I found something that almost worked in another post using sed.

sed '1s/^/[/;$!s/$/,/;$s/$/]/' file

but this didn't remove the new line after every number. How can I modify this sed command to get it to do what I want. Also, an explanation on the components of the sed command would also be appreciated. Thanks

python list sed

share|improve this question

asked Mar 23 at 15:17

Joshua SegalJoshua Segal

62

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  with open('file') as f:..data = f.read().strip().split();..nums = map(int, data) ? Why are you using sed here ?
  
  – han solo
  Mar 23 at 15:18
  
  

  
  
  
  


• 
  
  
  

  
  8
  

  
  
  
  
  
  

  
  
  Are you wanting to do this in Python or is this primarily a question on sed and you're just referencing Python because of the format? If the later - you don't need anything except the sed tag... and if the former - you'd don't need the sed tag... Please considering making an edit to your post to clarify that - thanks.
  
  – Jon Clements♦
  Mar 23 at 15:21
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Just in case you need it for some out of python operation awk 'BEGINRS=ORS="";OFS="," ;printf "[" $1=$1;print ENDprint "]n"' file
  
  – PS.
  Mar 23 at 15:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Append | tr -d 'n'?
  
  – Cyrus
  Mar 23 at 15:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you @Cyrus. That's a pretty good command line answer. You should make it an actual answer
  
  – Joshua Segal
  Mar 23 at 21:00
  
  

  
  
  
  

 | 
show 1 more comment

I'm trying to turn a list of numbers in a text file into python list form. For example, I want to make

1
2
3
4
5

into

[1,2,3,4,5]

I found something that almost worked in another post using sed.

sed '1s/^/[/;$!s/$/,/;$s/$/]/' file

but this didn't remove the new line after every number. How can I modify this sed command to get it to do what I want. Also, an explanation on the components of the sed command would also be appreciated. Thanks

python list sed

share|improve this question

asked Mar 23 at 15:17

Joshua SegalJoshua Segal

62

1
2
3
4
5

[1,2,3,4,5]

sed '1s/^/[/;$!s/$/,/;$s/$/]/' file

share|improve this question

asked Mar 23 at 15:17

Joshua SegalJoshua Segal

62

share|improve this question

asked Mar 23 at 15:17

Joshua SegalJoshua Segal

62

asked Mar 23 at 15:17

Joshua SegalJoshua Segal

62

asked Mar 23 at 15:17

Joshua SegalJoshua Segal

62

4 Answers
4

active

oldest

votes

1

With GNU sed for -z to read the whole file at once:

sed -z 's/n/,/g; s/^/[/; s/,$/]n/' file
[1,2,3,4,5]

With any awk in any shell on any UNIX box:

$ awk 'printf "%s%s", (NR>1 ? "," : "["), $0 ENDprint "]"' file
[1,2,3,4,5]

share|improve this answer

answered Mar 24 at 13:50

Ed MortonEd Morton

118k1345105

add a comment | 

0

You can append all the lines into the pattern space first before performing substitutions:

sed ':a;N;$!ba;s/n/,/g;s/^/[/;s/$/]/' file

This outputs:

[1,2,3,4,5]

share|improve this answer

answered Mar 23 at 15:37

blhsingblhsing

46.8k51747

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  when I do seq 5 | sed -z 's/^/[/; s/n/,/g; s/,?$/]n/' it seems to not even change the output. It's identical to seq 5
  
  – Joshua Segal
  Mar 23 at 20:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That isn't my code (that is oguzismail's code). Please run the demo here: tio.run/##K05N0U3PK/3/3yrR2s9aRTEp0bpYPyZPX0c/…
  
  – blhsing
  Mar 24 at 2:53
  
  

  
  
  
  

add a comment | 

0

This might work for you (GNU sed):

sed '1h;1!H;$!d;x;s/n/,/g;s/.*/[&]/' file

Copy the first line to the hold space, append copies of subsequent lines and delete the originals. At the end of the file, swap to the hold space, replace newlines by commas, and surround the remaining string by square brackets.

share|improve this answer

answered Mar 24 at 9:48

potongpotong

37.2k43063

add a comment | 

-1

If you want the list using python, a simple implementation is

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

share|improve this answer

answered Mar 23 at 15:26

MerigMerig

830410

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks. I probably should have added that this is supposed to be more of a sed exercise, but thanks for the code snippet
  
  – Joshua Segal
  Mar 23 at 20:16
  

  
  
  
  

add a comment | 

Your Answer

StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");

StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55315216%2fhow-to-turn-text-file-into-python-list-form%23new-answer', 'question_page');

);

Post as a guest

Name

Email

Required, but never shown

1

With GNU sed for -z to read the whole file at once:

sed -z 's/n/,/g; s/^/[/; s/,$/]n/' file
[1,2,3,4,5]

With any awk in any shell on any UNIX box:

$ awk 'printf "%s%s", (NR>1 ? "," : "["), $0 ENDprint "]"' file
[1,2,3,4,5]

share|improve this answer

answered Mar 24 at 13:50

Ed MortonEd Morton

118k1345105

add a comment | 

1

With GNU sed for -z to read the whole file at once:

sed -z 's/n/,/g; s/^/[/; s/,$/]n/' file
[1,2,3,4,5]

With any awk in any shell on any UNIX box:

$ awk 'printf "%s%s", (NR>1 ? "," : "["), $0 ENDprint "]"' file
[1,2,3,4,5]

share|improve this answer

answered Mar 24 at 13:50

Ed MortonEd Morton

118k1345105

add a comment | 

With GNU sed for -z to read the whole file at once:

sed -z 's/n/,/g; s/^/[/; s/,$/]n/' file
[1,2,3,4,5]

With any awk in any shell on any UNIX box:

$ awk 'printf "%s%s", (NR>1 ? "," : "["), $0 ENDprint "]"' file
[1,2,3,4,5]

share|improve this answer

answered Mar 24 at 13:50

Ed MortonEd Morton

118k1345105

sed -z 's/n/,/g; s/^/[/; s/,$/]n/' file
[1,2,3,4,5]

$ awk 'printf "%s%s", (NR>1 ? "," : "["), $0 ENDprint "]"' file
[1,2,3,4,5]

share|improve this answer

answered Mar 24 at 13:50

Ed MortonEd Morton

118k1345105

answered Mar 24 at 13:50

Ed MortonEd Morton

118k1345105

answered Mar 24 at 13:50

Ed MortonEd Morton

118k1345105

0

You can append all the lines into the pattern space first before performing substitutions:

sed ':a;N;$!ba;s/n/,/g;s/^/[/;s/$/]/' file

This outputs:

[1,2,3,4,5]

share|improve this answer

answered Mar 23 at 15:37

blhsingblhsing

46.8k51747

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  when I do seq 5 | sed -z 's/^/[/; s/n/,/g; s/,?$/]n/' it seems to not even change the output. It's identical to seq 5
  
  – Joshua Segal
  Mar 23 at 20:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That isn't my code (that is oguzismail's code). Please run the demo here: tio.run/##K05N0U3PK/3/3yrR2s9aRTEp0bpYPyZPX0c/…
  
  – blhsing
  Mar 24 at 2:53
  
  

  
  
  
  

add a comment | 

0

You can append all the lines into the pattern space first before performing substitutions:

sed ':a;N;$!ba;s/n/,/g;s/^/[/;s/$/]/' file

This outputs:

[1,2,3,4,5]

share|improve this answer

answered Mar 23 at 15:37

blhsingblhsing

46.8k51747

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  when I do seq 5 | sed -z 's/^/[/; s/n/,/g; s/,?$/]n/' it seems to not even change the output. It's identical to seq 5
  
  – Joshua Segal
  Mar 23 at 20:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That isn't my code (that is oguzismail's code). Please run the demo here: tio.run/##K05N0U3PK/3/3yrR2s9aRTEp0bpYPyZPX0c/…
  
  – blhsing
  Mar 24 at 2:53
  
  

  
  
  
  

add a comment | 

You can append all the lines into the pattern space first before performing substitutions:

sed ':a;N;$!ba;s/n/,/g;s/^/[/;s/$/]/' file

This outputs:

[1,2,3,4,5]

share|improve this answer

answered Mar 23 at 15:37

blhsingblhsing

46.8k51747

sed ':a;N;$!ba;s/n/,/g;s/^/[/;s/$/]/' file

[1,2,3,4,5]

share|improve this answer

answered Mar 23 at 15:37

blhsingblhsing

46.8k51747

answered Mar 23 at 15:37

blhsingblhsing

46.8k51747

answered Mar 23 at 15:37

blhsingblhsing

46.8k51747

0

This might work for you (GNU sed):

sed '1h;1!H;$!d;x;s/n/,/g;s/.*/[&]/' file

Copy the first line to the hold space, append copies of subsequent lines and delete the originals. At the end of the file, swap to the hold space, replace newlines by commas, and surround the remaining string by square brackets.

share|improve this answer

answered Mar 24 at 9:48

potongpotong

37.2k43063

add a comment | 

0

This might work for you (GNU sed):

sed '1h;1!H;$!d;x;s/n/,/g;s/.*/[&]/' file

Copy the first line to the hold space, append copies of subsequent lines and delete the originals. At the end of the file, swap to the hold space, replace newlines by commas, and surround the remaining string by square brackets.

share|improve this answer

answered Mar 24 at 9:48

potongpotong

37.2k43063

add a comment | 

This might work for you (GNU sed):

sed '1h;1!H;$!d;x;s/n/,/g;s/.*/[&]/' file

Copy the first line to the hold space, append copies of subsequent lines and delete the originals. At the end of the file, swap to the hold space, replace newlines by commas, and surround the remaining string by square brackets.

share|improve this answer

answered Mar 24 at 9:48

potongpotong

37.2k43063

sed '1h;1!H;$!d;x;s/n/,/g;s/.*/[&]/' file

share|improve this answer

answered Mar 24 at 9:48

potongpotong

37.2k43063

answered Mar 24 at 9:48

potongpotong

37.2k43063

answered Mar 24 at 9:48

potongpotong

37.2k43063

-1

If you want the list using python, a simple implementation is

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

share|improve this answer

answered Mar 23 at 15:26

MerigMerig

830410

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks. I probably should have added that this is supposed to be more of a sed exercise, but thanks for the code snippet
  
  – Joshua Segal
  Mar 23 at 20:16
  

  
  
  
  

add a comment | 

-1

If you want the list using python, a simple implementation is

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

share|improve this answer

answered Mar 23 at 15:26

MerigMerig

830410

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks. I probably should have added that this is supposed to be more of a sed exercise, but thanks for the code snippet
  
  – Joshua Segal
  Mar 23 at 20:16
  

  
  
  
  

add a comment | 

If you want the list using python, a simple implementation is

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

share|improve this answer

answered Mar 23 at 15:26

MerigMerig

830410

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

share|improve this answer

answered Mar 23 at 15:26

MerigMerig

830410

answered Mar 23 at 15:26

MerigMerig

830410

answered Mar 23 at 15:26

MerigMerig

830410