创建OrderedDicts列表

Question

我试图解析this逗号分隔的内容列出了一些调查HiPS。这里是我的代码：

with open('surveys.txt') as data: 
    text = data.read() 
    surveys = OrderedDict() 
    for survey in text.split('\n'): 
     for line in survey.split('\n'): 
      # Skip empty or comment lines 
      if line == '' or line.startswith('#'): 
       continue 
      try: 
       key, value = [_.strip() for _ in line.split('=')] 
       surveys[key] = value 
      except ValueError: 
       continue 

该给我一个OrderedDict包含上次调查的元素。这是因为在每次循环迭代之后，surveys的内容会被覆盖。

我试图通过为每个新survey创建OrderedDict，并将其附加到一个list，使用此代码来解决此问题：

with open('surveys.txt') as data: 
    text = data.read() 
    surveys = [] 
    for survey in text.split('\n'): 
     survey_OD = OrderedDict() 
     for line in survey.split('\n'): 
      # Skip empty or comment lines 
      if line == '' or line.startswith('#'): 
       continue 
      try: 
       key, value = [_.strip() for _ in line.split('=')] 
       survey_OD[key] = value 
      except ValueError: 
       continue 
     surveys.append(survey_OD) 

但是，这会为每个单独的OrderedDict逗号分隔值，这样：

OrderedDict([('hips_order', '3')]) OrderedDict([('hips_frame', 'galactic')]) OrderedDict([('hips_tile_format', 'jpeg fits')]) 

当，而不是我希望这样的事情：

OrderedDict([('hips_order', '3'), ('hips_frame', 'galactic'), ('hips_tile_format', 'jpeg fits')]) 

Answer 1

让我们略微提高你的第一种方法：

• 双换行符独立的调查，
• 收集名单的调查。

因此，我们可以写

from collections import OrderedDict 

with open('surveys.txt') as data: 
    text = data.read() 
surveys = list() 
for raw_survey in text.split('\n\n'): 
    survey = OrderedDict() 
    # Skip empty lines 
    for line in filter(None, raw_survey.split('\n')): 
     # Skip comment lines 
     if line.startswith('#'): 
      continue 
     try: 
      key, value = [_.strip() for _ in line.split('=')] 
      survey[key] = value 
     except ValueError: 
      continue 
    surveys.append(survey) 

会给我们

>>>surveys[0] 
OrderedDict([('ID', 'CDS/C/MUSE-M42'), ('creator_did', 'ivo://CDS/C/MUSE-M42'), 
      ('obs_collection', 'MUSE-M42'), 
      ('obs_title', 'MUSE map of the central Orion Nebula (M 42)'), (
      'obs_description', 
      'Integral-field spectroscopic dataset of the central part of the Orion Nebula (M 42), observed with the MUSE instrument at the ESO VLT (reduced the data with the public MUSE pipeline) representing a FITS cube with a spatial size of ~5.9\'x4.9\' (corresponding to ~0.76 pc x 0.63 pc) and a contiguous wavelength coverage of 4595...9366 Angstrom, spatially sampled at 0.2", with a sampling of 1.25 Angstrom in dispersion direction.'), 
      ('obs_ack', 'Based on data obtained from the ESO/VLT'), 
      ('prov_progenitor', 'MUSE Consortium'), 
      ('bib_reference', '2015A&A...582A.114W'), 
      ('obs_copyright', 'Copyright mention of the original data'), 
      ('obs_copyright_url', 'http://muse-vlt.eu/science/m42/'), 
      ('hips_release_date', '2015-07-07T00:29Z'), 
      ('hips_builder', 'Aladin/HipsGen v9.505'), ('hips_order', '12'), 
      ('hips_pixel_cut', '0 7760'), ('hips_tile_format', 'png fits'), 
      ('hips_cube_depth', '3818'), ('hips_cube_firstframe', '1909'), 
      ('hips_frame', 'equatorial'), ('dataproduct_type', 'image'), 
      ('t_min', '56693'), ('t_max', '56704'), ('em_min', '4,595e-7'), 
      ('em_max', '9,366e-7'), ('hips_version', '1.31'), 
      ('hips_creation_date', '03/07/15 12:00:30'), 
      ('hips_creator', 'CDS (P.Fernique)'), ('hips_tile_width', '512'), 
      ('hips_status', 'public master clonableOnce'), 
      ('hips_pixel_bitpix', '-32'), ('data_pixel_bitpix', '-32'), 
      ('hips_hierarchy', 'mean'), ('hips_initial_ra', '83.82094'), 
      ('hips_initial_dec', '-5.39542'), ('hips_initial_fov', '0.09811'), 
      ('hips_pixel_scale', '2.795E-5'), ('s_pixel_scale', '5.555E-5'), 
      ('moc_sky_fraction', '2.980E-7'), ('hips_estsize', '87653'), 
      ('data_bunit', '10**(-20)*erg/s/cm**2/Angstrom'), 
      ('data_cube_crpix3', '1'), ('data_cube_crval3', '4595'), 
      ('data_cube_cdelt3', '1.25'), ('data_cube_bunit3', 'Angstrom'), 
      ('client_application', 'AladinDesktop'), 
      ('hips_copyright', 'CNRS/Unistra'), ('obs_regime', 'Optical'), 
      ('hips_service_url', 'http://alasky.unistra.fr/MUSE/MUSE-M42'), (
      'hips_service_url_1', 
      'http://alaskybis.unistra.fr/MUSE/MUSE-M42'), 
      ('hips_status_1', 'public mirror clonable'), (
      'hips_service_url_2', 
      'https://alaskybis.unistra.fr/MUSE/MUSE-M42'), 
      ('hips_status_2', 'public mirror clonable'), ('moc_order', '12'), 
      ('obs_initial_ra', '83.82094'), ('obs_initial_dec', '-5.39542'), 
      ('obs_initial_fov', '0.014314526715905856'), 
      ('TIMESTAMP', '1490387811000')])