operating system - Trouble outputing file size to a label from a listbox in Python 3 -

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i'm using os.path.getsize() output size of file label. file path stored in listbox. function works, outputs file size in bits, wrote following convert more appropriate units, , displaying in tb. it's executing of if statements, regardless if condition true.

activefile = fileslist.get(active) filesize = os.path.getsize(activefile) filesizestr = str(filesize) + ' bits'  if filesize > 8:     filesize = filesize / 8     filesizestr = str(filesize) + ' bytes'  if filesize < 1024:     filesize = filesize / 1024     filesizestr = str(filesize) + ' kb'  if filesize < 1024:     filesize = filesize / 1024     filesizestr = str(filesize) + ' mb'  if filesize < 1024:     filesize = filesize / 1024     filesizestr = str (filesize) + ' gb'  if filesize < 1024:     filesize = filesize / 1024     filesizestr = str(filesize) + ' tb'

there couple problems in code,

  • you re-assign filesizestr. need concatenate new values.
  • you need check if filesize greater or equal 1024, not smaller.
  • new filesize should remainder of first calculation, not result of it.

also, checking larger 1 better imho. 

#constants tb = 2**43 gb = 2**33 mb = 2**23 kb = 2**13 bytes = 2**3  #some test value here filesize = 8  #empty string filled , shown later filesizestr = ""  #calculations if filesize >= tb:     filetb = filesize / tb     filesize = filesize % tb     filesizestr += str(filetb) + 'tb '  if filesize >= gb:     filegb = filesize / gb     filesize = filesize % gb     filesizestr += str(filegb) + 'gb '  if filesize >= mb:     filemb = filesize / mb     filesize = filesize % mb     filesizestr += str(filemb) + 'mb '  if filesize >= kb:     filekb = filesize / kb     filesize = filesize % kb     filesizestr += str(filekb) + 'kb '  if filesize >= bytes:     fileb = filesize / bytes     filesize = filesize % bytes     filesizestr += str(fileb) + 'byte(s) '  filesizestr += str(filesize) + 'bit(s)'  print filesizestr

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