Indexing lines of a txt file [duplicate]
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
edited Nov 27 '18 at 14:38
TrebuchetMS
2,85511023
asked Nov 27 '18 at 14:33
G1I2AG1I2A
62
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.
add a comment |
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
edited Nov 27 '18 at 14:38
TrebuchetMS
2,85511023
asked Nov 27 '18 at 14:33
G1I2AG1I2A
62
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
add a comment |
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
edited Nov 27 '18 at 14:38
TrebuchetMS
2,85511023
asked Nov 27 '18 at 14:33
G1I2AG1I2A
62
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
edited Nov 27 '18 at 14:38
TrebuchetMS
2,85511023
asked Nov 27 '18 at 14:33
G1I2AG1I2A
62
edited Nov 27 '18 at 14:38
TrebuchetMS
2,85511023
asked Nov 27 '18 at 14:33
G1I2AG1I2A
62
edited Nov 27 '18 at 14:38
TrebuchetMS
2,85511023
edited Nov 27 '18 at 14:38
TrebuchetMS
2,85511023
edited Nov 27 '18 at 14:38
TrebuchetMS
2,85511023
2,85511023
asked Nov 27 '18 at 14:33
G1I2AG1I2A
62
asked Nov 27 '18 at 14:33
G1I2AG1I2A
62
asked Nov 27 '18 at 14:33
G1I2AG1I2A
62
62
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.
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
add a comment |
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
add a comment |
2 Answers
2
active
oldest
votes
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)
answered Nov 27 '18 at 16:01
kantalkantal
642127
add a comment |
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..
answered Nov 27 '18 at 16:14
Richard RobertsRichard Roberts
84
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
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)
answered Nov 27 '18 at 16:01
kantalkantal
642127
add a comment |
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)
answered Nov 27 '18 at 16:01
kantalkantal
642127
add a comment |
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)
answered Nov 27 '18 at 16:01
kantalkantal
642127
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)
answered Nov 27 '18 at 16:01
kantalkantal
642127
edited Nov 27 '18 at 16:06
answered Nov 27 '18 at 16:01
kantalkantal
642127
answered Nov 27 '18 at 16:01
kantalkantal
642127
answered Nov 27 '18 at 16:01
kantalkantal
642127
642127
add a comment |
add a comment |
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..
answered Nov 27 '18 at 16:14
Richard RobertsRichard Roberts
84
add a comment |
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..
answered Nov 27 '18 at 16:14
Richard RobertsRichard Roberts
84
add a comment |
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..
answered Nov 27 '18 at 16:14
Richard RobertsRichard Roberts
84
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..
answered Nov 27 '18 at 16:14
Richard RobertsRichard Roberts
84
answered Nov 27 '18 at 16:14
Richard RobertsRichard Roberts
84
answered Nov 27 '18 at 16:14
Richard RobertsRichard Roberts
84
answered Nov 27 '18 at 16:14
Richard RobertsRichard Roberts
84
84
add a comment |
add a comment |
Im going to check it out
– G1I2A
Nov 27 '18 at 14:43