[英]How to Read the 2nd and 3rd line then Every Fifth Line After: 2nd, 3rd, 7th, 8th, 12th, 13th, etc
[英]How to write every 12th line to a new file
我想選擇文件中的第12行並將這些行寫入新文件。 有人有建議嗎? 我有126行,前6行是標題,因此我需要選擇第7、19和31行,依此類推,直到到達文件末尾。 並且每10行應選擇一個新文件。
代碼的編寫方式我可以編寫一個文件,例如P_1,它由10(每12個)行7,19,31 ...,109組成,但是我想制作12個文件。 因此,第一個文件是從第7行開始的P_1,而P_2從第8行開始。 我如何循環從7到8,依此類推,最終到達18行?
我會在范圍內為我寫新的12個文件(行得通嗎?)。
對於范圍(1,12)中的i:open('output%i.txt'%i,'w +')as g:我只是不知道如何更改行,以便它們與正確的文件相對應。 雅知道我的意思嗎?
再次感謝!
如果文件很大,則此方法很好,因為它不會將整個文件加載到內存中。 (至於for line in f.readlines()
)
from itertools import islice #used to get the 7th, 19th, etc... lines
import fileinput #to iterate over lines without loading whole file into memoru
with open('output.txt','w+') as g:
for line in islice(fileinput.input('file.txt'),6,None,12): #start at 6 because iterable 0-indexed, that is the 7th element has index 6
g.write(line)
或 (@Elazar指出的方法)
with open('output.txt', 'w') as g, open('file.txt') as f:
for line in islice(f,6,None,12):
g.write(line)
with open("input") as f:
for i, line in enumerate(f):
if (i-7) % 12 == 0: print line.rstrip("\n")
with open('newfile.txt', 'w') as outfile, open('input.txt') as infile:
newfile.writelines(k for i, k in enumerate(infile) if i%12==7)
# creating the file as a base for me, you don't need this part
with open('dan.txt','w') as f:
f.write('\n'.join(str(i) for i in xrange(1,127)))
# your desired code
with open('dan.txt') as g:
li = g.readlines()
for i in xrange(6,19):
with open('P_%d.txt' % (i-5),'w') as f:
f.writelines(li[x] for x in xrange(i,126,12))
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