Indexing lines of a txt file [duplicate]












0
















This question already has an answer here:




  • How to add line numbers to an output file?

    2 answers



  • PYTHON- adding line numbers to the output

    3 answers




I'm trying to find a way to index the lines of a text file.



I use the following code to read the txt data



with open('file.txt','r') as f:

    lines=f.read()

    print(lines)`


the result is 



Aberdeen, Scotland

Adelaide, Australia

Algiers, Algeria


but I would like to put 1:,2:,3: in front of each line.So I suppose that I have to do something like the following



with open('file.txt','a') as  f:

    for i in len(f):

        line='i:'+(ith line of txt file)

        f.write(line)


but I have a hard time solving it, any help will be great.






python python-3.x







share|improve this question















marked as duplicate by Anto Jurković, jpp python
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 Nov 27 '18 at 16:53


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.



















  • Im going to check it out

    – G1I2A
    Nov 27 '18 at 14:43
















0
















This question already has an answer here:




  • How to add line numbers to an output file?

    2 answers



  • PYTHON- adding line numbers to the output

    3 answers




I'm trying to find a way to index the lines of a text file.



I use the following code to read the txt data



with open('file.txt','r') as f:

    lines=f.read()

    print(lines)`


the result is 



Aberdeen, Scotland

Adelaide, Australia

Algiers, Algeria


but I would like to put 1:,2:,3: in front of each line.So I suppose that I have to do something like the following



with open('file.txt','a') as  f:

    for i in len(f):

        line='i:'+(ith line of txt file)

        f.write(line)


but I have a hard time solving it, any help will be great.






python python-3.x







share|improve this question















marked as duplicate by Anto Jurković, jpp python
Users with the  python badge can single-handedly close python questions as duplicates and reopen them as needed.

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 Nov 27 '18 at 16:53


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.



















  • Im going to check it out

    – G1I2A
    Nov 27 '18 at 14:43














0












0








0









This question already has an answer here:




  • How to add line numbers to an output file?

    2 answers



  • PYTHON- adding line numbers to the output

    3 answers




I'm trying to find a way to index the lines of a text file.



I use the following code to read the txt data



with open('file.txt','r') as f:

    lines=f.read()

    print(lines)`


the result is 



Aberdeen, Scotland

Adelaide, Australia

Algiers, Algeria


but I would like to put 1:,2:,3: in front of each line.So I suppose that I have to do something like the following



with open('file.txt','a') as  f:

    for i in len(f):

        line='i:'+(ith line of txt file)

        f.write(line)


but I have a hard time solving it, any help will be great.






python python-3.x







share|improve this question

















This question already has an answer here:




  • How to add line numbers to an output file?

    2 answers



  • PYTHON- adding line numbers to the output

    3 answers




I'm trying to find a way to index the lines of a text file.



I use the following code to read the txt data



with open('file.txt','r') as f:

    lines=f.read()

    print(lines)`


the result is 



Aberdeen, Scotland

Adelaide, Australia

Algiers, Algeria


but I would like to put 1:,2:,3: in front of each line.So I suppose that I have to do something like the following



with open('file.txt','a') as  f:

    for i in len(f):

        line='i:'+(ith line of txt file)

        f.write(line)


but I have a hard time solving it, any help will be great.





This question already has an answer here:




  • How to add line numbers to an output file?

    2 answers



  • PYTHON- adding line numbers to the output

    3 answers







python python-3.x




python python-3.x






share|improve this question















share|improve this question













share|improve this question




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edited Nov 27 '18 at 14:38









TrebuchetMS

2,85511023




2,85511023










asked Nov 27 '18 at 14:33









G1I2AG1I2A

62




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marked as duplicate by Anto Jurković, jpp python
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 Nov 27 '18 at 16:53


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.









marked as duplicate by Anto Jurković, jpp python
Users with the  python badge can single-handedly close python questions as duplicates and reopen them as needed.

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 Nov 27 '18 at 16:53


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.















  • Im going to check it out

    – G1I2A
    Nov 27 '18 at 14:43



















  • Im going to check it out

    – G1I2A
    Nov 27 '18 at 14:43

















Im going to check it out

– G1I2A
Nov 27 '18 at 14:43





Im going to check it out

– G1I2A
Nov 27 '18 at 14:43












2 Answers
2






active

oldest

votes


















0














You must handle two files, one for the input and one for the output:



with open("file.txt") as finp, open("newfile.txt","w") as fout:

  for index,line in enumerate(finp):

    fout.write(str(index)+": "+line)


If you want to start numbering from 1, write: enumerate(finp,1)






share|improve this answer

































    0














    You don't need two handle files. Just use seek.



    file_path = "file.txt"
    

    
with open(file_path,"r+") as file:
    
    lines = file.readlines()
    
    file.seek(0)
    
    for index,line in enumerate(lines):
    
        to_write_string = str(index)+': '+line
    
        file.write(to_write_string)


    This should do the trick..






    share|improve this answer






























      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      0














      You must handle two files, one for the input and one for the output:



      with open("file.txt") as finp, open("newfile.txt","w") as fout:
      
  for index,line in enumerate(finp):
      
    fout.write(str(index)+": "+line)


      If you want to start numbering from 1, write: enumerate(finp,1)






      share|improve this answer






























        0














        You must handle two files, one for the input and one for the output:



        with open("file.txt") as finp, open("newfile.txt","w") as fout:
        
  for index,line in enumerate(finp):
        
    fout.write(str(index)+": "+line)


        If you want to start numbering from 1, write: enumerate(finp,1)






        share|improve this answer




























          0












          0








          0







          You must handle two files, one for the input and one for the output:



          with open("file.txt") as finp, open("newfile.txt","w") as fout:
          
  for index,line in enumerate(finp):
          
    fout.write(str(index)+": "+line)


          If you want to start numbering from 1, write: enumerate(finp,1)






          share|improve this answer















          You must handle two files, one for the input and one for the output:



          with open("file.txt") as finp, open("newfile.txt","w") as fout:
          
  for index,line in enumerate(finp):
          
    fout.write(str(index)+": "+line)


          If you want to start numbering from 1, write: enumerate(finp,1)







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 27 '18 at 16:06

























          answered Nov 27 '18 at 16:01









          kantalkantal

          642127




          642127

























              0














              You don't need two handle files. Just use seek.



              file_path = "file.txt"
              

              
with open(file_path,"r+") as file:
              
    lines = file.readlines()
              
    file.seek(0)
              
    for index,line in enumerate(lines):
              
        to_write_string = str(index)+': '+line
              
        file.write(to_write_string)


              This should do the trick..






              share|improve this answer




























                0














                You don't need two handle files. Just use seek.



                file_path = "file.txt"
                

                
with open(file_path,"r+") as file:
                
    lines = file.readlines()
                
    file.seek(0)
                
    for index,line in enumerate(lines):
                
        to_write_string = str(index)+': '+line
                
        file.write(to_write_string)


                This should do the trick..






                share|improve this answer


























                  0












                  0








                  0







                  You don't need two handle files. Just use seek.



                  file_path = "file.txt"
                  

                  
with open(file_path,"r+") as file:
                  
    lines = file.readlines()
                  
    file.seek(0)
                  
    for index,line in enumerate(lines):
                  
        to_write_string = str(index)+': '+line
                  
        file.write(to_write_string)


                  This should do the trick..






                  share|improve this answer













                  You don't need two handle files. Just use seek.



                  file_path = "file.txt"
                  

                  
with open(file_path,"r+") as file:
                  
    lines = file.readlines()
                  
    file.seek(0)
                  
    for index,line in enumerate(lines):
                  
        to_write_string = str(index)+': '+line
                  
        file.write(to_write_string)


                  This should do the trick..







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 27 '18 at 16:14









                  Richard RobertsRichard Roberts

                  84




                  84















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