linux - Exploring a directory using a for loop in python - does the order change? -


one of folders has json files, , i'm reading data contain classification svm. question had based on code:

    filename in os.listdir(os.getcwd()):        if re.search('.json$',filename):             try:                open(filename) json_data:                    print filename

each time pipe output, find filenames printed in same order, so:

    95231464576.json     131777220274261.json     17151210249.json     122624927762214.json     159287900855286.json     155273941171682.json     5265971983.json     169635939813776.json     159429967503904.json     169114363192327.json     170797436313930.json     155963124522916.json

there few text files, , python files in directory.
question here is: determines order in these files printed? for loop have way of looking files?
tried examining whether order based on size (max min or min max) or last modified(i had no reason these tests,i tried them since can't think of other insight).
tried snippet 4 times, , order same each time.

i have labelled classes in different folders, if can assured of order helpful in labeling training set(i don't know how idea is).

the order not defined, , depends on filesystem.

i remember reading, many years ago, 1 of improvements of ext3 on ext2 keeping pointer in directory listing , beginning next operation on entry. program stat() open() entry, scanning beginning of (internal) list occur twice ext2; ext3 second operation on desired entry making search fast. significant many files in directory.

the point being listing directory begin list of entries whereever pointer happened be. also, order in entries created may affect order. ls program performs sort operation before producing output visually consistent , usable.


Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

Rendering JButton to get the JCheckBox behavior in a JTable by using images does not update my table -

i rendering jbutton image on simulate jcheckbox behavior. why don't let jtable render jcheckbox? because need bigger checkboxes , there's no way can resize them (as far know). so, have own table cell renderer , editor. both renders jbutton , checkbox images on them. trying change image checked image unchecked image (or vice versa) , update cell value (boolean true or false). however, reason, getcelleditorvalue() not update table. so, release mouse, value goes original one. any appreciated! lot! public class tableexample extends jframe { jscrollpane pane; jpanel panel; jtable table; object[][] data; mytablemodel tm; renderer buttoncolumn; public tableexample(object[][] data) throws ioexception { string[] columns = {"column#1", "column#2", "column#3", "column#4", "column#5", "column#6"}; this.data = data; this.setpreferredsize(new dimension(700, 500));
Read more