如何阅读这个文件，跳过一些使用Python的行？

我需要跳过47行文件（标题等）的，则可能阅读本如何阅读这个文件，跳过一些使用Python的行？

4.163186002791e+04 3.578830331359e+04 3.076496349687e+04 2.644671278966e+04 2.273458304119e+04 
1.954349752908e+04 1.680032112209e+04 1.444218412726e+04 1.241504140604e+04 1.067243373686e+04 
9.174423035938e+03 7.886677033340e+03 6.779682426302e+03 5.828068476394e+03 5.010025548360e+03 
1.737988920100e+03 1.284332855871e+03 1.104060538508e+03 8.158747205330e+02 7.013564117662e+02 
6.029121922103e+02 5.182858606802e+02 4.455379022877e+02 2.433020871700e+02 2.091515701348e+02 
1.797945089525e+02 1.545580816278e+02 1.328639052196e+02 9.818329499070e+01 7.255514128762e+01 
5.361653963401e+01 4.609078195788e+01 3.962135930423e+01 3.406000172766e+01 2.927925083995e+01 
2.516953864546e+01 2.163667639887e+01 1.859969593339e+01 1.598899398582e+01 1.374473698894e+01 
1.181548977143e+01 1.015703673713e+01 8.731368506527e+00 7.505810795983e+00 6.452275569743e+00 
5.546617302183e+00 4.768079596776e+00 4.098819479081e+00 3.523498461194e+00 3.028931005477e+00 
2.603782330822e+00 2.238308635635e+00 1.924133783786e+00 1.654057335509e+00 1.421889523591e+00 
1.222309392724e+00 1.050742850800e+00 9.032578372386e-01 7.764742057598e-01 6.674862562538e-01 
5.737961402745e-01 4.932566139141e-01 3.133421372728e-01 2.315524554696e-01 1.990511474577e-01 
1.711118080085e-01 1.470941072881e-01 1.264475938317e-01 1.086990789815e-01 9.344179207682e-02 
8.032605785014e-02 6.905128236880e-02 5.935906385039e-02 5.102727046220e-02

作为列表，然后再次跳过21行并读取在相同格式的文件的一部分，呈现以上。首先我的想法是这样的：

from itertools import islice 
n=15 
with open('91_FULLMERGED.edi') as f: 
    lines_after_48 = f.readlines()[48:] 
    while True: 
     next_15_lines = list(islice(lines_after_48, n)) 
     if not next_15_lines: 
      break

但是，这是行不通的。

[email protected]:~/EDIs$ python k1.py

它只是停在码头。

如何解决这个问题？

来源

2016-03-02 Richard Rublev

请尽量解释自己更好的，你得到了什么异常？或者如果你没有得到例外，那么问题是什么？ – GLaDOS

您是否尝试在您的条件下打印声明？你不是要求在这个代码中打印任何东西...... –

@Dot_Py现在我添加了print next_15_lines，它只是在屏幕上不停地打印数字。 –

代码

我使用CSV读者造成格式为CSV与分隔符'。起初，我刚刚跳过了47行（f，None）。之后，csv模块正在诀窍中。如果你想输出为文件，你可以使用csv编写器。如果要从输出列表中删除空字符串，可以取消注释代码。但是，文件的输出与输入不相似。这取决于你想如何使用数据。

import csv 

with open('input.txt', 'rb') as f: 
    for i in range(47): 
     next(f, None) 
    reader = csv.reader(f,delimiter=' ') 
    values = list(reader) 

# if you want to remove the '' 
#for idx, val in enumerate(values): 
# values[idx] = [x for x in values[idx] if x != ''] 

print values 

with open('output.txt', 'wb') as f: 
    writer = csv.writer(f, delimiter=' ', quotechar='"', quoting=csv.QUOTE_MINIMAL) 
    for line in values: 
     writer.writerow(line)

屏幕输出

[['4.163186002791e+04', '', '3.578830331359e+04', '', '3.076496349687e+04', '', '2.644671278966e+04', '', '2.273458304119e+04'], 
['1.954349752908e+04', '', '1.680032112209e+04', '', '1.444218412726e+04', '', '1.241504140604e+04', '', '1.067243373686e+04'], 
['9.174423035938e+03', '', '7.886677033340e+03', '', '6.779682426302e+03', '', '5.828068476394e+03', '', '5.010025548360e+03'], 
['1.737988920100e+03', '', '1.284332855871e+03', '', '1.104060538508e+03', '', '8.158747205330e+02', '', '7.013564117662e+02'], 
['6.029121922103e+02', '', '5.182858606802e+02', '', '4.455379022877e+02', '', '2.433020871700e+02', '', '2.091515701348e+02'], 
['1.797945089525e+02', '', '1.545580816278e+02', '', '1.328639052196e+02', '', '9.818329499070e+01', '', '7.255514128762e+01'], 
['5.361653963401e+01', '', '4.609078195788e+01', '', '3.962135930423e+01', '', '3.406000172766e+01', '', '2.927925083995e+01'], 
['2.516953864546e+01', '', '2.163667639887e+01', '', '1.859969593339e+01', '', '1.598899398582e+01', '', '1.374473698894e+01'], 
['1.181548977143e+01', '', '1.015703673713e+01', '', '8.731368506527e+00', '', '7.505810795983e+00', '', '6.452275569743e+00'], 
['5.546617302183e+00', '', '4.768079596776e+00', '', '4.098819479081e+00', '', '3.523498461194e+00', '', '3.028931005477e+00'], 
['2.603782330822e+00', '', '2.238308635635e+00', '', '1.924133783786e+00', '', '1.654057335509e+00', '', '1.421889523591e+00'], 
['1.222309392724e+00', '', '1.050742850800e+00', '', '9.032578372386e-01', '', '7.764742057598e-01', '', '6.674862562538e-01'], 
['5.737961402745e-01', '', '4.932566139141e-01', '', '3.133421372728e-01', '', '2.315524554696e-01', '', '1.990511474577e-01'], 
['1.711118080085e-01', '', '1.470941072881e-01', '', '1.264475938317e-01', '', '1.086990789815e-01', '', '9.344179207682e-02'], 
['8.032605785014e-02', '', '6.905128236880e-02', '', '5.935906385039e-02', '', '5.102727046220e-02']]

输出到文件output.txt的

4.163186002791e+04 3.578830331359e+04 3.076496349687e+04 2.644671278966e+04 2.273458304119e+04 
1.954349752908e+04 1.680032112209e+04 1.444218412726e+04 1.241504140604e+04 1.067243373686e+04 
9.174423035938e+03 7.886677033340e+03 6.779682426302e+03 5.828068476394e+03 5.010025548360e+03 
1.737988920100e+03 1.284332855871e+03 1.104060538508e+03 8.158747205330e+02 7.013564117662e+02 
6.029121922103e+02 5.182858606802e+02 4.455379022877e+02 2.433020871700e+02 2.091515701348e+02 
1.797945089525e+02 1.545580816278e+02 1.328639052196e+02 9.818329499070e+01 7.255514128762e+01 
5.361653963401e+01 4.609078195788e+01 3.962135930423e+01 3.406000172766e+01 2.927925083995e+01 
2.516953864546e+01 2.163667639887e+01 1.859969593339e+01 1.598899398582e+01 1.374473698894e+01 
1.181548977143e+01 1.015703673713e+01 8.731368506527e+00 7.505810795983e+00 6.452275569743e+00 
5.546617302183e+00 4.768079596776e+00 4.098819479081e+00 3.523498461194e+00 3.028931005477e+00 
2.603782330822e+00 2.238308635635e+00 1.924133783786e+00 1.654057335509e+00 1.421889523591e+00 
1.222309392724e+00 1.050742850800e+00 9.032578372386e-01 7.764742057598e-01 6.674862562538e-01 
5.737961402745e-01 4.932566139141e-01 3.133421372728e-01 2.315524554696e-01 1.990511474577e-01 
1.711118080085e-01 1.470941072881e-01 1.264475938317e-01 1.086990789815e-01 9.344179207682e-02 
8.032605785014e-02 6.905128236880e-02 5.935906385039e-02 5.102727046220e-02

我的输入值我用

SKIP (for line 1 ... removed 45 Lines for better readablity 
SKIP to line 47) 
4.163186002791e+04 3.578830331359e+04 3.076496349687e+04 2.644671278966e+04 2.273458304119e+04 
1.954349752908e+04 1.680032112209e+04 1.444218412726e+04 1.241504140604e+04 1.067243373686e+04 
9.174423035938e+03 7.886677033340e+03 6.779682426302e+03 5.828068476394e+03 5.010025548360e+03 
1.737988920100e+03 1.284332855871e+03 1.104060538508e+03 8.158747205330e+02 7.013564117662e+02 
6.029121922103e+02 5.182858606802e+02 4.455379022877e+02 2.433020871700e+02 2.091515701348e+02 
1.797945089525e+02 1.545580816278e+02 1.328639052196e+02 9.818329499070e+01 7.255514128762e+01 
5.361653963401e+01 4.609078195788e+01 3.962135930423e+01 3.406000172766e+01 2.927925083995e+01 
2.516953864546e+01 2.163667639887e+01 1.859969593339e+01 1.598899398582e+01 1.374473698894e+01 
1.181548977143e+01 1.015703673713e+01 8.731368506527e+00 7.505810795983e+00 6.452275569743e+00 
5.546617302183e+00 4.768079596776e+00 4.098819479081e+00 3.523498461194e+00 3.028931005477e+00 
2.603782330822e+00 2.238308635635e+00 1.924133783786e+00 1.654057335509e+00 1.421889523591e+00 
1.222309392724e+00 1.050742850800e+00 9.032578372386e-01 7.764742057598e-01 6.674862562538e-01 
5.737961402745e-01 4.932566139141e-01 3.133421372728e-01 2.315524554696e-01 1.990511474577e-01 
1.711118080085e-01 1.470941072881e-01 1.264475938317e-01 1.086990789815e-01 9.344179207682e-02 
8.032605785014e-02 6.905128236880e-02 5.935906385039e-02 5.102727046220e-02

来源

2016-03-02 14:56:44 Kordi

给出linecache的机会。并在大文件的情况下，尝试发电机。

import linecache 
from sys import argv 

def get_specific_lines(f, start, stop): 
    for i in range(start, stop): 
     yield linecache.getline(f, i) 

script, f, s, e = argv 

# check code if (f)ile exists, (s)tart and (e)nd are numeric.  

for line in get_specific_lines(f, int(s), int(e)): 
    print line 



$ wc -l asbc.txt 
197310 asbc.txt 
$ python read.py asbc.txt 144322 144325 
Bu yarım dəqiqə ərzində Qleb qabaqcadan dəqiq hesablanmış ləng hərəkətlə əlini qəbulediciyə uzatdı, diktora xırıldamağa imkan vermədən boynunu bururmuş kimi açarın dəstəyini burdu. 

Onun azca bundan əvvəlki canlı sifəti yorğun, bozumtul rəng almışdı. 

Pryançikovun başı isə başqa problemə qarışmışdı. Hansı gücləndirici kaskadı qoymaq lazım olduğu haqda fikirləşə-fikirləşə o, qayğısız zümzümə edirdi:

来源

2016-03-02 15:18:13 marmeladze

如何阅读这个文件，跳过一些使用Python的行？

回答

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