sorting - How do you sort by ascending order from a txt file in python? -


i new python , have simple question. have txt file road names , lengths. i.e. main street 56 miles. stumped on how call on file in python , sort road lengths in ascending order. help.

let's assume there "miles" after every number. (this untested code can edited think idea right).

edit: tested 

import collections originaldict = {} newdict = collections.ordereddict()  def isnum(string):     try:         if string ".":             return true         float(string)         return true      except exception:         return false  line in open(input_file, "r"):     string = line[:line.find("miles") - 1]     print string     curnum = ""     c in reversed(string):         if not isnum(c):             break         curnum = c + curnum     originaldict[float(curnum)] = []     originaldict[float(curnum)].append(line)   num in sorted(originaldict.iterkeys()):     newdict[num] = []     newdict[num].append(originaldict[num][0])     del originaldict[num][0]   open(output_file, "a") o:     value in newdict.values():         line in value:             o.write(line + "\n")

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