Btukfyl

import os

i = 0

f = 'myfile%04i.txt' % i

while os.path.exists(f):

    i += 1

    f = 'myfile%04i.txt' % i

import os

i = 0

f = 'myfile%04i.txt' % i

while os.path.exists(f):

    i += 1

    f = 'myfile%04i.txt' % i

import os

i = 0

f = 'myfile%04i.txt' % i

while os.path.exists(f):

    i += 1

    f = 'myfile%04i.txt' % i

import os

i = 0

f = 'myfile%04i.txt' % i

while os.path.exists(f):

    i += 1

    f = 'myfile%04i.txt' % i

add a comment | 

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import os

from itertools import count

f = next(f for f in ('myfile%04i.txt' % i for i in count()) if not os.path.exists(f))

print(f)

import os

from itertools import count

f = next(f for f in ('myfile%04i.txt' % i for i in count()) if not os.path.exists(f))

print(f)

import os

from itertools import count

f = next(f for f in ('myfile%04i.txt' % i for i in count()) if not os.path.exists(f))

print(f)

import os

from itertools import count

f = next(f for f in ('myfile%04i.txt' % i for i in count()) if not os.path.exists(f))

print(f)

add a comment | 

import os



i = 0

while os.path.exists('myfile%04i.txt' % i):

    i += 1

import os



i = 0

while os.path.exists('myfile%04i.txt' % i):

    i += 1

import os



i = 0

while os.path.exists('myfile%04i.txt' % i):

    i += 1

import os



i = 0

while os.path.exists('myfile%04i.txt' % i):

    i += 1

add a comment | 

import os

i = 0

while True:

    f = 'myfile%04i.txt' % i

    if not os.path.exists(f):

        break

    i += 1

print f

import os

i = 0

while True:

    f = 'myfile%04i.txt' % i

    if not os.path.exists(f):

        break

    i += 1

print f

import os

i = 0

while True:

    f = 'myfile%04i.txt' % i

    if not os.path.exists(f):

        break

    i += 1

print f

import os

i = 0

while True:

    f = 'myfile%04i.txt' % i

    if not os.path.exists(f):

        break

    i += 1

print f

add a comment | 

import os

f = 'myfile0000.txt'

while os.path.exists(f):

    i += 1

    f = 'myfile%04i.txt' % i

import os

f = 'myfile0000.txt'

while os.path.exists(f):

    i += 1

    f = 'myfile%04i.txt' % i

import os

f = 'myfile0000.txt'

while os.path.exists(f):

    i += 1

    f = 'myfile%04i.txt' % i

import os

f = 'myfile0000.txt'

while os.path.exists(f):

    i += 1

    f = 'myfile%04i.txt' % i

add a comment | 

import os

from itertools import count



cursor = count()

it = iter((path for path in map(lambda x: 'myfile%04i.txt' % x, cursor) if not os.path.exists(path)))

first = next(it, None)



if first:

    print(first)

myfile0000.txt

import os

from itertools import count



cursor = count()

it = iter((path for path in map(lambda x: 'myfile%04i.txt' % x, cursor) if not os.path.exists(path)))

first = next(it, None)



if first:

    print(first)

myfile0000.txt

import os

from itertools import count



cursor = count()

it = iter((path for path in map(lambda x: 'myfile%04i.txt' % x, cursor) if not os.path.exists(path)))

first = next(it, None)



if first:

    print(first)

myfile0000.txt

import os

from itertools import count



cursor = count()

it = iter((path for path in map(lambda x: 'myfile%04i.txt' % x, cursor) if not os.path.exists(path)))

first = next(it, None)



if first:

    print(first)

myfile0000.txt

add a comment |