創建OrderedDicts列表

Question

我試圖解析this逗號分隔的內容列出了一些調查HiPS。這裏是我的代碼：

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 

該給我一個OrderedDict包含上次調查的元素。這是因爲在每次循環迭代之後，surveys的內容會被覆蓋。

我試圖通過爲每個新survey創建OrderedDict，並將其附加到一個list，使用此代碼來解決此問題：

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，這會爲每個單獨的OrderedDict逗號分隔值，這樣：

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

當，而不是我希望這樣的事情：

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

Answer 1

讓我們略微提高你的第一種方法：

• 雙換行符獨立的調查，
• 收集名單的調查。

因此，我們可以寫

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) 

會給我們

>>>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')])