Add number in 001 format to file name in python

Question

I upload a txt file to array and then I upload the array to a website, that downloads a file to a specific directory. The file name contains first ten letters of a array line. Problem: add number in 00n format before the file name. I tried several tips here but nothing works as I wished. In txt file are random sentences like "Dog is barking"

def openFile():
with open('test0.txt','r') as f:
    content = f.read().splitlines()
    for line in content:
       line=line.strip()
       line=line.replace(' ','+')
       arr.append(line)
    return arr  

def openWeb()
 for line in arr:
    url="url"
    name = line.replace('+', '')[0:9]
    urllib.request.urlretrieve(url, "dir"+"_"+name+".mp3")

so the output should look like

'001_nameoffirst' 
'002_nameofsecond'

No, we need to know what's inside that iterable. Show the content of arr or at least some samples. — Kasravnd
– Kasravnd, Commented Sep 29, 2018 at 16:55
@Kasrâmvd random sentences, but just with words. No numbers can be used in sentence. — carolinesed
– carolinesed, Commented Sep 29, 2018 at 16:59
I don't get how your code relates to the question, but it sounds like you need to use a format string: "{:03}_{}".format(23, "name") evaluates to "023_name" — zch
– zch, Commented Sep 29, 2018 at 17:02

vash_the_stampede · Accepted Answer · 2018-10-01 18:39:46Z

2

Using enumerate and zfill this can be done, also you can use the argument start = 1 in combination with enumerate

l = ['nameoffirst', 'nameofsecond']
new_l = ['{}_'.format(str(idx).zfill(3))+ item for idx, item in enumerate(l, start = 1)]

Expanded loop:

new_l = [] 
for idx, item in enumerate(l, start = 1):
    new_l.append('{}_'.format(str(idx).zfill(3)) + item)

['001_nameoffirst', '002_nameofsecond']

answered Oct 1, 2018 at 18:39

vash_the_stampede

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Comments

N Chauhan · Accepted Answer · 2018-09-29 17:03:54Z

0

You could use string formatting and zfill to achieve the 00x effect. I'm not sure what your data is, but this illustrates my point:

names = ['nameoffirst', 'nameofsecond']
for i, name in enumerate(names):
    form = '{}_{}'.format(str(i).zfill(3), name)
    print(form)  # or do whatever you
    # need with 'form'

answered Sep 29, 2018 at 17:03

N Chauhan

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