I have a string that is being created from a listdir. It is Comma delimited... I want to write this to the txt file as separate lines. NOTING that each time I run this there will a different number in the list. So I cannot count on any indexing etc. What can I do to write this to separate lines one for each of the files located from the listdir? THANKS Code : #...snip dir_src = "C:\\users\\tjv36463\\Desktop\\BearCollar\\NewFiles\\" from os import listdir from os . path import isfile , join onlyfiles = [ f for f in listdir ( dir_src ) if isfile ( join ( dir_src , f ) ) ] onlyfiles2 = str ( onlyfiles ) file = open ( "log.txt" , 'w' ) file . write ( onlyfiles2 ) file . close ( ) #...snip Result : [ 'rangedate_D032495_20160822124736.txt' , 'rangedate_D032498_20160822125645.txt' , 'rangedate_D032499_20160822125129.txt' , 'rangedate_D032500_20160822125032.txt' , 'rangedate_D032501_20160822125559.txt' , 'rangedate_D032502_20160822125356.txt' , 'rangedate_D033108_20160822125458.txt' ] Im looking for : [ 'rangedate_D032495_20160822124736.txt' , 'rangedate_D032498_20160822125645.txt' , 'rangedate_D032499_20160822125129.txt' , 'rangedate_D032500_20160822125032.txt' , 'rangedate_D032501_20160822125559.txt' , 'rangedate_D032502_20160822125356.txt' , 'rangedate_D033108_20160822125458.txt' ]

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Write String to txt file

jaykapalczynski

I have a string that is being created from a listdir. It is Comma delimited...

I want to write this to the txt file as separate lines. NOTING that each time I run this there will a different number in the list. So I cannot count on any indexing etc.

What can I do to write this to separate lines one for each of the files located from the listdir?

THANKS

Code<SPAN class="punctuation token">:</SPAN>
<SPAN class="comment token">#...snip</SPAN>
dir_src <SPAN class="operator token">=</SPAN> <SPAN class="string token">"C:\\users\\tjv36463\\Desktop\\BearCollar\\NewFiles\\"</SPAN>
<SPAN class="keyword token">from</SPAN> os <SPAN class="keyword token">import</SPAN> listdir
<SPAN class="keyword token">from</SPAN> os<SPAN class="punctuation token">.</SPAN>path <SPAN class="keyword token">import</SPAN> isfile<SPAN class="punctuation token">,</SPAN> join
onlyfiles <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>f <SPAN class="keyword token">for</SPAN> f <SPAN class="keyword token">in</SPAN> listdir<SPAN class="punctuation token">(</SPAN>dir_src<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">if</SPAN> isfile<SPAN class="punctuation token">(</SPAN>join<SPAN class="punctuation token">(</SPAN>dir_src<SPAN class="punctuation token">,</SPAN> f<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
onlyfiles2 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>onlyfiles<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
file <SPAN class="operator token">=</SPAN> open<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"log.txt"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'w'</SPAN><SPAN class="punctuation token">)</SPAN>
file<SPAN class="punctuation token">.</SPAN>write<SPAN class="punctuation token">(</SPAN>onlyfiles2<SPAN class="punctuation token">)</SPAN>
file<SPAN class="punctuation token">.</SPAN>close<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="comment token">#...snip</SPAN>

Result<SPAN class="punctuation token">:</SPAN>
<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'rangedate_D032495_20160822124736.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032498_20160822125645.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032499_20160822125129.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032500_20160822125032.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032501_20160822125559.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032502_20160822125356.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D033108_20160822125458.txt'</SPAN><SPAN class="punctuation token">]</SPAN>

Im looking <SPAN class="keyword token">for</SPAN><SPAN class="punctuation token">:</SPAN>
<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'rangedate_D032495_20160822124736.txt'</SPAN><SPAN class="punctuation token">,</SPAN> 
<SPAN class="string token">'rangedate_D032498_20160822125645.txt'</SPAN><SPAN class="punctuation token">,</SPAN> 
<SPAN class="string token">'rangedate_D032499_20160822125129.txt'</SPAN><SPAN class="punctuation token">,</SPAN> 
<SPAN class="string token">'rangedate_D032500_20160822125032.txt'</SPAN><SPAN class="punctuation token">,</SPAN> 
<SPAN class="string token">'rangedate_D032501_20160822125559.txt'</SPAN><SPAN class="punctuation token">,</SPAN>
<SPAN class="string token">'rangedate_D032502_20160822125356.txt'</SPAN><SPAN class="punctuation token">,</SPAN> 
<SPAN class="string token">'rangedate_D033108_20160822125458.txt'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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Accepted answers

DarrenWiens2

There may be a better way than this, but you can manually insert line break characters at the end of each write statement. Below will result in different lines but no commas. The commented option will add a comma to every line, including the final line. You could add a little extra logic to check if you're at the final item in the list and not add a comma.

onlyfiles <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>f <SPAN class="keyword token">for</SPAN> f <SPAN class="keyword token">in</SPAN> listdir<SPAN class="punctuation token">(</SPAN>dir_src<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">if</SPAN> isfile<SPAN class="punctuation token">(</SPAN>join<SPAN class="punctuation token">(</SPAN>dir_src<SPAN class="punctuation token">,</SPAN> f<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
file <SPAN class="operator token">=</SPAN> open<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"log.txt"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'w'</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="keyword token">for</SPAN> onlyfile <SPAN class="keyword token">in</SPAN> onlyfiles<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; file<SPAN class="punctuation token">.</SPAN>write<SPAN class="punctuation token">(</SPAN>str<SPAN class="punctuation token">(</SPAN>onlyfile<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="string token">'\n'</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># or ',\n' if you want the trailing comma</SPAN>
file<SPAN class="punctuation token">.</SPAN>close<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

jaykapalczynski

Thanks Christian....very helpful...much appreciated.

jaykapalczynski

Thanks Darren....quick and painless...I was trying this to the variable with no success...perfect....Cheers

XanderBakker

Or if you want it to apear as a "list object" with items on each line, replace ',' with ',\n' in variable onlyfiles2.

So write onlyfiles2.replace(',', ',\n') instead

Christian_Wells

You could use a replace function to change your commas to new line characters:

ls <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="string token">'rangedate_D032495_20160822124736.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032498_20160822125645.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032499_20160822125129.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032500_20160822125032.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032501_20160822125559.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D032502_20160822125356.txt'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'rangedate_D033108_20160822125458.txt'</SPAN><SPAN class="punctuation token">]</SPAN>

<SPAN class="keyword token">print</SPAN> str<SPAN class="punctuation token">(</SPAN>ls<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>replace<SPAN class="punctuation token">(</SPAN><SPAN class="string token">','</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'\n'</SPAN><SPAN class="punctuation token">)</SPAN>

<SPAN class="comment token">#Output:</SPAN>
<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'rangedate_D032495_20160822124736.txt'</SPAN>
 <SPAN class="string token">'rangedate_D032498_20160822125645.txt'</SPAN>
 <SPAN class="string token">'rangedate_D032499_20160822125129.txt'</SPAN>
 <SPAN class="string token">'rangedate_D032500_20160822125032.txt'</SPAN>
 <SPAN class="string token">'rangedate_D032501_20160822125559.txt'</SPAN>
 <SPAN class="string token">'rangedate_D032502_20160822125356.txt'</SPAN>
 <SPAN class="string token">'rangedate_D033108_20160822125458.txt'</SPAN><SPAN class="punctuation token">]</SPAN>

<SPAN class="comment token">#If you want to replace the square brackets we can handle that as well:</SPAN>
<SPAN class="keyword token">print</SPAN> str<SPAN class="punctuation token">(</SPAN>ls<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>replace<SPAN class="punctuation token">(</SPAN><SPAN class="string token">','</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'\n'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>replace<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'['</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">''</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>replace<SPAN class="punctuation token">(</SPAN><SPAN class="string token">']'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">''</SPAN><SPAN class="punctuation token">)</SPAN>

<SPAN class="comment token">#Another option:</SPAN>
<SPAN class="keyword token">for</SPAN> i <SPAN class="keyword token">in</SPAN> ls<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> i

<SPAN class="comment token">#Output:</SPAN>
rangedate_D032495_20160822124736<SPAN class="punctuation token">.</SPAN>txt
rangedate_D032498_20160822125645<SPAN class="punctuation token">.</SPAN>txt
rangedate_D032499_20160822125129<SPAN class="punctuation token">.</SPAN>txt
rangedate_D032500_20160822125032<SPAN class="punctuation token">.</SPAN>txt
rangedate_D032501_20160822125559<SPAN class="punctuation token">.</SPAN>txt
rangedate_D032502_20160822125356<SPAN class="punctuation token">.</SPAN>txt
rangedate_D033108_20160822125458<SPAN class="punctuation token">.</SPAN>txt<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

DarrenWiens2

onlyfiles <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>f <SPAN class="keyword token">for</SPAN> f <SPAN class="keyword token">in</SPAN> listdir<SPAN class="punctuation token">(</SPAN>dir_src<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">if</SPAN> isfile<SPAN class="punctuation token">(</SPAN>join<SPAN class="punctuation token">(</SPAN>dir_src<SPAN class="punctuation token">,</SPAN> f<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
file <SPAN class="operator token">=</SPAN> open<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"log.txt"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'w'</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="keyword token">for</SPAN> onlyfile <SPAN class="keyword token">in</SPAN> onlyfiles<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; file<SPAN class="punctuation token">.</SPAN>write<SPAN class="punctuation token">(</SPAN>str<SPAN class="punctuation token">(</SPAN>onlyfile<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="string token">'\n'</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># or ',\n' if you want the trailing comma</SPAN>
file<SPAN class="punctuation token">.</SPAN>close<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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