How to append text to the end of the first line

with open ("a.txt", "a+") as f:

    f.write("Hello ")

Currently, this enters into the text file as shown below.

hello

hello

I've also tried

for line in f:

    f.write(line.replace("n", ""))

which didn't work.

Any ideas?

asked Jan 20 at 1:55

Dansey

716

How did it not work?

– Mad Physicist
Jan 20 at 6:58

Are you trying to insert text into a line in an existing file?

– Mad Physicist
Jan 20 at 7:01

add a comment |

with open ("a.txt", "a+") as f:

    f.write("Hello ")

Currently, this enters into the text file as shown below.

hello

hello

I've also tried

for line in f:

    f.write(line.replace("n", ""))

which didn't work.

Any ideas?

asked Jan 20 at 1:55

Dansey

716

How did it not work?

– Mad Physicist
Jan 20 at 6:58

Are you trying to insert text into a line in an existing file?

– Mad Physicist
Jan 20 at 7:01

add a comment |

with open ("a.txt", "a+") as f:

    f.write("Hello ")

Currently, this enters into the text file as shown below.

hello

hello

I've also tried

for line in f:

    f.write(line.replace("n", ""))

which didn't work.

Any ideas?

asked Jan 20 at 1:55

Dansey

716

with open ("a.txt", "a+") as f:

    f.write("Hello ")

Currently, this enters into the text file as shown below.

hello

hello

I've also tried

for line in f:

    f.write(line.replace("n", ""))

which didn't work.

Any ideas?

python python-3.x

asked Jan 20 at 1:55

Dansey

716

asked Jan 20 at 1:55

Dansey

716

asked Jan 20 at 1:55

Dansey

716

asked Jan 20 at 1:55

Dansey

716

asked Jan 20 at 1:55

Dansey

716

How did it not work?

– Mad Physicist
Jan 20 at 6:58

Are you trying to insert text into a line in an existing file?

– Mad Physicist
Jan 20 at 7:01

add a comment |

How did it not work?

– Mad Physicist
Jan 20 at 6:58

Are you trying to insert text into a line in an existing file?

– Mad Physicist
Jan 20 at 7:01

How did it not work?

– Mad Physicist
Jan 20 at 6:58

Are you trying to insert text into a line in an existing file?

– Mad Physicist
Jan 20 at 7:01

add a comment |

3 Answers
3

active

oldest

votes

Maybe use:

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.rename("b.txt", "a.txt")

edited Jan 20 at 7:13

answered Jan 20 at 2:05

U9-Forward

15.2k41438

@U9-Forward f.read() is coming up empty for some reason, any ideas?

– Dansey
Jan 20 at 6:28

@Dansey You should only use my code, make my code the full code for it to work.

– U9-Forward
Jan 20 at 6:47

@U9-Forward I've been troubleshooting this for quite a while, f.seek(0) still seems to return a blank read.

– Dansey
Jan 20 at 6:48

@Dansey You should just copy and paste my code into an empty file, then it should work...

– U9-Forward
Jan 20 at 6:49

@U9-Forward, yes, I'm not using the previous code, read is empty.

– Dansey
Jan 20 at 6:49

|
show 7 more comments

with open('a.txt', 'r') as istr, open('output.txt', 'w') as ostr:

    for i, line in enumerate(istr):

        # Get rid of the trailing newline (if any).

        line = line.rstrip('n')

        if i == 0:

            line += 'Hello'

        print(line, file=ostr)

edited Jan 20 at 2:26

answered Jan 20 at 1:59

mrid

3,96731334

You need to format your code, or better use with open(...) as f, open(...) as f2: it's more compact.

– Chiheb Nexus
Jan 20 at 2:17

1

@ChihebNexus Yup, i was ready to say that also.

– U9-Forward
Jan 20 at 2:19

add a comment |

Here's an edited version of @U9-Forward's code that worked for me.

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.remove("a.txt")

    os.rename("b.txt", "a.txt")

answered Jan 20 at 7:03

Dansey

716

Any idea why this was required?

– Dansey
Jan 20 at 7:03

Oh yeah, i was ready to edit to this.

– U9-Forward
Jan 20 at 7:03

It's needed because you can't open a file twice. so you should do remove and rename.

– U9-Forward
Jan 20 at 7:04

Got it, I figured that you couldn't open it twice so I had tried to change w and a+ to r+ which just resulted in two lines.

– Dansey
Jan 20 at 7:08

1

Yup, maybe you should accept your own answer in two days, but still, you won't get +15 since it is self-accepted.

– U9-Forward
Jan 20 at 7:09

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

Maybe use:

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.rename("b.txt", "a.txt")

edited Jan 20 at 7:13

answered Jan 20 at 2:05

U9-Forward

15.2k41438

@U9-Forward f.read() is coming up empty for some reason, any ideas?

– Dansey
Jan 20 at 6:28

@Dansey You should only use my code, make my code the full code for it to work.

– U9-Forward
Jan 20 at 6:47

@U9-Forward I've been troubleshooting this for quite a while, f.seek(0) still seems to return a blank read.

– Dansey
Jan 20 at 6:48

@Dansey You should just copy and paste my code into an empty file, then it should work...

– U9-Forward
Jan 20 at 6:49

@U9-Forward, yes, I'm not using the previous code, read is empty.

– Dansey
Jan 20 at 6:49

|
show 7 more comments

Maybe use:

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.rename("b.txt", "a.txt")

edited Jan 20 at 7:13

answered Jan 20 at 2:05

U9-Forward

15.2k41438

@U9-Forward f.read() is coming up empty for some reason, any ideas?

– Dansey
Jan 20 at 6:28

@Dansey You should only use my code, make my code the full code for it to work.

– U9-Forward
Jan 20 at 6:47

@U9-Forward I've been troubleshooting this for quite a while, f.seek(0) still seems to return a blank read.

– Dansey
Jan 20 at 6:48

@Dansey You should just copy and paste my code into an empty file, then it should work...

– U9-Forward
Jan 20 at 6:49

@U9-Forward, yes, I'm not using the previous code, read is empty.

– Dansey
Jan 20 at 6:49

|
show 7 more comments

Maybe use:

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.rename("b.txt", "a.txt")

edited Jan 20 at 7:13

answered Jan 20 at 2:05

U9-Forward

15.2k41438

Maybe use:

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.rename("b.txt", "a.txt")

edited Jan 20 at 7:13

answered Jan 20 at 2:05

U9-Forward

15.2k41438

edited Jan 20 at 7:13

answered Jan 20 at 2:05

U9-Forward

15.2k41438

answered Jan 20 at 2:05

U9-Forward

15.2k41438

answered Jan 20 at 2:05

U9-Forward

15.2k41438

@U9-Forward f.read() is coming up empty for some reason, any ideas?

– Dansey
Jan 20 at 6:28

@Dansey You should only use my code, make my code the full code for it to work.

– U9-Forward
Jan 20 at 6:47

@U9-Forward I've been troubleshooting this for quite a while, f.seek(0) still seems to return a blank read.

– Dansey
Jan 20 at 6:48

@Dansey You should just copy and paste my code into an empty file, then it should work...

– U9-Forward
Jan 20 at 6:49

@U9-Forward, yes, I'm not using the previous code, read is empty.

– Dansey
Jan 20 at 6:49

|
show 7 more comments

@U9-Forward f.read() is coming up empty for some reason, any ideas?

– Dansey
Jan 20 at 6:28

@Dansey You should only use my code, make my code the full code for it to work.

– U9-Forward
Jan 20 at 6:47

@U9-Forward I've been troubleshooting this for quite a while, f.seek(0) still seems to return a blank read.

– Dansey
Jan 20 at 6:48

@Dansey You should just copy and paste my code into an empty file, then it should work...

– U9-Forward
Jan 20 at 6:49

@U9-Forward, yes, I'm not using the previous code, read is empty.

– Dansey
Jan 20 at 6:49

@U9-Forward f.read() is coming up empty for some reason, any ideas?

– Dansey
Jan 20 at 6:28

@Dansey You should only use my code, make my code the full code for it to work.

– U9-Forward
Jan 20 at 6:47

@U9-Forward I've been troubleshooting this for quite a while, f.seek(0) still seems to return a blank read.

– Dansey
Jan 20 at 6:48

@Dansey You should just copy and paste my code into an empty file, then it should work...

– U9-Forward
Jan 20 at 6:49

@U9-Forward, yes, I'm not using the previous code, read is empty.

– Dansey
Jan 20 at 6:49

|
show 7 more comments

with open('a.txt', 'r') as istr, open('output.txt', 'w') as ostr:

    for i, line in enumerate(istr):

        # Get rid of the trailing newline (if any).

        line = line.rstrip('n')

        if i == 0:

            line += 'Hello'

        print(line, file=ostr)

edited Jan 20 at 2:26

answered Jan 20 at 1:59

mrid

3,96731334

You need to format your code, or better use with open(...) as f, open(...) as f2: it's more compact.

– Chiheb Nexus
Jan 20 at 2:17

1

@ChihebNexus Yup, i was ready to say that also.

– U9-Forward
Jan 20 at 2:19

add a comment |

with open('a.txt', 'r') as istr, open('output.txt', 'w') as ostr:

    for i, line in enumerate(istr):

        # Get rid of the trailing newline (if any).

        line = line.rstrip('n')

        if i == 0:

            line += 'Hello'

        print(line, file=ostr)

edited Jan 20 at 2:26

answered Jan 20 at 1:59

mrid

3,96731334

You need to format your code, or better use with open(...) as f, open(...) as f2: it's more compact.

– Chiheb Nexus
Jan 20 at 2:17

1

@ChihebNexus Yup, i was ready to say that also.

– U9-Forward
Jan 20 at 2:19

add a comment |

with open('a.txt', 'r') as istr, open('output.txt', 'w') as ostr:

    for i, line in enumerate(istr):

        # Get rid of the trailing newline (if any).

        line = line.rstrip('n')

        if i == 0:

            line += 'Hello'

        print(line, file=ostr)

edited Jan 20 at 2:26

answered Jan 20 at 1:59

mrid

3,96731334

with open('a.txt', 'r') as istr, open('output.txt', 'w') as ostr:

    for i, line in enumerate(istr):

        # Get rid of the trailing newline (if any).

        line = line.rstrip('n')

        if i == 0:

            line += 'Hello'

        print(line, file=ostr)

edited Jan 20 at 2:26

answered Jan 20 at 1:59

mrid

3,96731334

edited Jan 20 at 2:26

answered Jan 20 at 1:59

mrid

3,96731334

answered Jan 20 at 1:59

mrid

3,96731334

answered Jan 20 at 1:59

mrid

3,96731334

You need to format your code, or better use with open(...) as f, open(...) as f2: it's more compact.

– Chiheb Nexus
Jan 20 at 2:17

1

@ChihebNexus Yup, i was ready to say that also.

– U9-Forward
Jan 20 at 2:19

add a comment |

You need to format your code, or better use with open(...) as f, open(...) as f2: it's more compact.

– Chiheb Nexus
Jan 20 at 2:17

1

@ChihebNexus Yup, i was ready to say that also.

– U9-Forward
Jan 20 at 2:19

You need to format your code, or better use with open(...) as f, open(...) as f2: it's more compact.

– Chiheb Nexus
Jan 20 at 2:17

@ChihebNexus Yup, i was ready to say that also.

– U9-Forward
Jan 20 at 2:19

add a comment |

Here's an edited version of @U9-Forward's code that worked for me.

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.remove("a.txt")

    os.rename("b.txt", "a.txt")

answered Jan 20 at 7:03

Dansey

716

Any idea why this was required?

– Dansey
Jan 20 at 7:03

Oh yeah, i was ready to edit to this.

– U9-Forward
Jan 20 at 7:03

It's needed because you can't open a file twice. so you should do remove and rename.

– U9-Forward
Jan 20 at 7:04

Got it, I figured that you couldn't open it twice so I had tried to change w and a+ to r+ which just resulted in two lines.

– Dansey
Jan 20 at 7:08

1

Yup, maybe you should accept your own answer in two days, but still, you won't get +15 since it is self-accepted.

– U9-Forward
Jan 20 at 7:09

add a comment |

Here's an edited version of @U9-Forward's code that worked for me.

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.remove("a.txt")

    os.rename("b.txt", "a.txt")

answered Jan 20 at 7:03

Dansey

716

Any idea why this was required?

– Dansey
Jan 20 at 7:03

Oh yeah, i was ready to edit to this.

– U9-Forward
Jan 20 at 7:03

It's needed because you can't open a file twice. so you should do remove and rename.

– U9-Forward
Jan 20 at 7:04

Got it, I figured that you couldn't open it twice so I had tried to change w and a+ to r+ which just resulted in two lines.

– Dansey
Jan 20 at 7:08

1

Yup, maybe you should accept your own answer in two days, but still, you won't get +15 since it is self-accepted.

– U9-Forward
Jan 20 at 7:09

add a comment |

Here's an edited version of @U9-Forward's code that worked for me.

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.remove("a.txt")

    os.rename("b.txt", "a.txt")

answered Jan 20 at 7:03

Dansey

716

Here's an edited version of @U9-Forward's code that worked for me.

with open ("a.txt", "r") as f, open ("b.txt", "w") as f2:

    f2.write(f.read().rstrip()+"hello ")

    os.remove("a.txt")

    os.rename("b.txt", "a.txt")

answered Jan 20 at 7:03

Dansey

716

answered Jan 20 at 7:03

Dansey

716

answered Jan 20 at 7:03

Dansey

716

answered Jan 20 at 7:03

Dansey

716

Any idea why this was required?

– Dansey
Jan 20 at 7:03

Oh yeah, i was ready to edit to this.

– U9-Forward
Jan 20 at 7:03

It's needed because you can't open a file twice. so you should do remove and rename.

– U9-Forward
Jan 20 at 7:04

Got it, I figured that you couldn't open it twice so I had tried to change w and a+ to r+ which just resulted in two lines.

– Dansey
Jan 20 at 7:08

1

Yup, maybe you should accept your own answer in two days, but still, you won't get +15 since it is self-accepted.

– U9-Forward
Jan 20 at 7:09

add a comment |

Any idea why this was required?

– Dansey
Jan 20 at 7:03

Oh yeah, i was ready to edit to this.

– U9-Forward
Jan 20 at 7:03

It's needed because you can't open a file twice. so you should do remove and rename.

– U9-Forward
Jan 20 at 7:04

Got it, I figured that you couldn't open it twice so I had tried to change w and a+ to r+ which just resulted in two lines.

– Dansey
Jan 20 at 7:08

1

Yup, maybe you should accept your own answer in two days, but still, you won't get +15 since it is self-accepted.

– U9-Forward
Jan 20 at 7:09

Any idea why this was required?

– Dansey
Jan 20 at 7:03

Oh yeah, i was ready to edit to this.

– U9-Forward
Jan 20 at 7:03

It's needed because you can't open a file twice. so you should do remove and rename.

– U9-Forward
Jan 20 at 7:04

Got it, I figured that you couldn't open it twice so I had tried to change w and a+ to r+ which just resulted in two lines.

– Dansey
Jan 20 at 7:08

Yup, maybe you should accept your own answer in two days, but still, you won't get +15 since it is self-accepted.

– U9-Forward
Jan 20 at 7:09

add a comment |

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