How do I organize data in alphabetical order?

Question

So I have some pieces of data stored in a folder as .txt , eg FRED.txt & BOB.txt , which in the text file contain their 5 random numbers chosen from 1 to 10 and I am stuck as to how I can print their names (in alphabetical order) along with their highest random number. I know that I have to use the glob or os libraries but I don't really know where to go with them. So far I have this...

import glob, os
dataFile = open("directory_pathway", "r+")
dataFile.read() 
# Somehow printing names & highest number here.
dataFile.close()

Any help is much appreciated. Thanks :)

Answer 1

import glob, os, re

names = []

path = os.path.join('path_to_dir', '*.txt')

for filename in glob.glob(path):
    names.append(filename)

names.sort()

for filename in names:
    print(re.search(r'\w+.txt', filename).group(0))
    text = open(filename, 'r')
    data = text.read().split()
    print(max(data, key = int), '\n')
    text.close()

raw_input()

Answer 2

sort the file names found with glob , map the contents to int and print the filename f and the max :

import glob
import os 

path = "path/"
for f in sorted(glob.glob(os.path.join(path,"*.txt"))):
    with open(os.path.join(path, f)) as fl:
        print("Filename: {}\nMax value: {}".format(f, max(map(int, fl))))

map returns a map object so we don't need to create a list to find the max , we only store one line/value at a time.

Answer 3

import os
result_dict = {}
for i in sorted([i for i in os.listdir("/path/to/folder/") if i.endswith(".txt")]):
    f = open(i)
    a = f.readlines()
    num = sorted([int(j.strip()) for j in a])
    print num
    result_dict[i] = num[-1]

for i,j in sorted(result_dict.items(), key=lambda s: s[0]):
    print i,j

Answer 4

1. Get only text file from the input directory by glob module.
2. Use for loop to iterate every text file.
3. Read file content.
4. Get max number from the file content.
5. Add into result dictionary.
6. Sort dictionary keys and print values.

input: Following contents in FRED.txt file

2
4
6
8
10

code:

import glob
import os

dir_path = "/home/vivek/Desktop/stackoverflow/input"
text_files = glob.glob(dir_path+"/*.txt")
print "Test Files:", text_files

result = {}
for i in text_files:
    # Read file content.
    with open(i, 'rb') as fp:
        data = fp.read()
    max_no = max([int(j) for j in data.split()])
    result[os.path.basename(i)] = max_no

#- Sort and print File names.
sorted_file_names = sorted(result.keys())
for i in sorted_file_names:
    print "File Name: %s, MAx Random Number: %d"%(i, result[i])

output:

Test Files: ['/home/vivek/Desktop/stackoverflow/input/AOB.txt', '/home/vivek/Desktop/stackoverflow/input/ABO.txt', '/home/vivek/Desktop/stackoverflow/input/FRED.txt', '/home/vivek/Desktop/stackoverflow/input/BOB.txt']
File Name: ABO.txt, MAx Random Number: 9
File Name: AOB.txt, MAx Random Number: 9
File Name: BOB.txt, MAx Random Number: 9
File Name: FRED.txt, MAx Random Number: 10
vivek@vivek:~/Desktop/stackoverflow/input$ 

Answer 5

sorted(glob.glob("*.txt")) will get you the list of filenames, sorted. Then iterate over that list, open each file, and print whatever you like.