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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 Metadata-Version: 2.1
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2 Name: pyaml
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3 Version: 20.4.0
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4 Summary: PyYAML-based module to produce pretty and readable YAML-serialized data
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5 Home-page: https://github.com/mk-fg/pretty-yaml
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6 Author: Mike Kazantsev
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7 Author-email: mk.fraggod@gmail.com
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8 License: WTFPL
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9 Keywords: yaml serialization pretty print format human readable readability
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10 Platform: UNKNOWN
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11 Classifier: Development Status :: 4 - Beta
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12 Classifier: Intended Audience :: Developers
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13 Classifier: Programming Language :: Python
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14 Classifier: Programming Language :: Python :: 2.7
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15 Classifier: Programming Language :: Python :: 3.5
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16 Classifier: Topic :: Software Development
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17 Classifier: Topic :: Software Development :: Libraries :: Python Modules
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18 Requires-Dist: PyYAML
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19
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20 pretty-yaml (or pyaml)
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21 ======================
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22
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23 PyYAML-based python module to produce pretty and readable YAML-serialized data.
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24
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25 This module is for serialization only, see `ruamel.yaml`_ module for literate
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26 YAML parsing (keeping track of comments, spacing, line/column numbers of values, etc).
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27
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28 [note: to dump stuff parsed by ruamel.yaml with this module, use only ``YAML(typ='safe')`` there]
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29
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30 .. contents::
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31 :backlinks: none
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32
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33
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34 Warning
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35 -------
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36
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37 Prime goal of this module is to produce human-readable output that can be easily
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38 manipulated and re-used, but maybe with some occasional caveats.
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39
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40 One good example of such "caveat" is that e.g. ``{'foo': '123'}`` will serialize
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41 to ``foo: 123``, which for PyYAML would be a bug, as 123 will then be read back
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42 as an integer from that, but here it's a feature.
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43
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44 So please do not rely on the thing to produce output that can always be
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45 deserialized exactly to what was exported, at least - use PyYAML (e.g. with
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46 options from the next section) for that.
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47
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48
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49 What this module does and why
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50 -----------------------------
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51
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52 YAML is generally nice and easy format to read *if* it was written by humans.
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53
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54 PyYAML can a do fairly decent job of making stuff readable, and the best
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55 combination of parameters for such output that I've seen so far is probably this one::
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56
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57 >>> m = [123, 45.67, {1: None, 2: False}, u'some text']
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58 >>> data = dict(a=u'asldnsa\nasldpáknsa\n', b=u'whatever text', ma=m, mb=m)
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59 >>> yaml.safe_dump(data, sys.stdout, allow_unicode=True, default_flow_style=False)
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60 a: 'asldnsa
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61
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62 asldpáknsa
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63
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64 '
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65 b: whatever text
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66 ma: &id001
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67 - 123
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68 - 45.67
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69 - 1: null
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70 2: false
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71 - some text
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72 mb: *id001
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73
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74 pyaml tries to improve on that a bit, with the following tweaks:
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75
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76 * Most human-friendly representation options in PyYAML (that I know of) get
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77 picked as defaults.
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78
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79 * Does not dump "null" values, if possible, replacing these with just empty
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80 strings, which have the same meaning but reduce visual clutter and are easier
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81 to edit.
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82
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83 * Dicts, sets, OrderedDicts, defaultdicts, namedtuples, etc are representable
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84 and get sorted on output (OrderedDicts and namedtuples keep their ordering),
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85 so that output would be as diff-friendly as possible, and not arbitrarily
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86 depend on python internals.
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87
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88 It appears that at least recent PyYAML versions also do such sorting for
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89 python dicts.
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90
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91 * List items get indented, as they should be.
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92
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93 * bytestrings that can't be auto-converted to unicode raise error, as yaml has
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94 no "binary bytes" (i.e. unix strings) type.
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95
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96 * Attempt is made to pick more readable string representation styles, depending
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97 on the value, e.g.::
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98
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99 >>> yaml.safe_dump(cert, sys.stdout)
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100 cert: '-----BEGIN CERTIFICATE-----
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101
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102 MIIH3jCCBcagAwIBAgIJAJi7AjQ4Z87OMA0GCSqGSIb3DQEBCwUAMIHBMRcwFQYD
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103
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104 VQQKFA52YWxlcm9uLm5vX2lzcDEeMBwGA1UECxMVQ2VydGlmaWNhdGUgQXV0aG9y
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105 ...
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106
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107 >>> pyaml.p(cert):
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108 cert: |
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109 -----BEGIN CERTIFICATE-----
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110 MIIH3jCCBcagAwIBAgIJAJi7AjQ4Z87OMA0GCSqGSIb3DQEBCwUAMIHBMRcwFQYD
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111 VQQKFA52YWxlcm9uLm5vX2lzcDEeMBwGA1UECxMVQ2VydGlmaWNhdGUgQXV0aG9y
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112 ...
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113
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114 * "force_embed" option to avoid having &id stuff scattered all over the output
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115 (which might be beneficial in some cases, hence the option).
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116
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117 * "&id" anchors, if used, get labels from the keys they get attached to,
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118 not just use meaningless enumerators.
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119
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120 * "string_val_style" option to only apply to strings that are values, not keys,
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121 i.e::
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122
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123 >>> pyaml.p(data, string_val_style='"')
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124 key: "value\nasldpáknsa\n"
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125 >>> yaml.safe_dump(data, sys.stdout, allow_unicode=True, default_style='"')
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126 "key": "value\nasldpáknsa\n"
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127
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128 * "sort_dicts=False" option to leave dict item ordering to python, and not
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129 force-sort them in yaml output, which can be important for python 3.6+ where
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130 they retain ordering info.
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131
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132 * Has an option to add vertical spacing (empty lines) between keys on different
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133 depths, to make output much more seekable.
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134
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135 Result for the (rather meaningless) example above (without any additional
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136 tweaks)::
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137
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138 >>> pyaml.p(data)
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139 a: |
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140 asldnsa
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141 asldpáknsa
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142 b: 'whatever text'
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143 ma: &ma
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144 - 123
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145 - 45.67
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146 - 1:
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147 2: false
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148 - 'some text'
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149 mb: *ma
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150
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151 ----------
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152
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153 Extended example::
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154
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155 >>> pyaml.dump(conf, sys.stdout, vspacing=[2, 1]):
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156 destination:
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157
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158 encoding:
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159 xz:
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160 enabled: true
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161 min_size: 5120
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162 options:
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163 path_filter:
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164 - \.(gz|bz2|t[gb]z2?|xz|lzma|7z|zip|rar)$
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165 - \.(rpm|deb|iso)$
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166 - \.(jpe?g|gif|png|mov|avi|ogg|mkv|webm|mp[34g]|flv|flac|ape|pdf|djvu)$
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167 - \.(sqlite3?|fossil|fsl)$
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168 - \.git/objects/[0-9a-f]+/[0-9a-f]+$
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169
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170 result:
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171 append_to_file:
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172 append_to_lafs_dir:
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173 print_to_stdout: true
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174
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175 url: http://localhost:3456/uri
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176
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177
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178 filter:
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179 - /(CVS|RCS|SCCS|_darcs|\{arch\})/$
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180 - /\.(git|hg|bzr|svn|cvs)(/|ignore|attributes|tags)?$
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181 - /=(RELEASE-ID|meta-update|update)$
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182
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183
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184 http:
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185
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186 ca_certs_files: /etc/ssl/certs/ca-certificates.crt
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187
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188 debug_requests: false
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189
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190 request_pool_options:
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191 cachedConnectionTimeout: 600
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192 maxPersistentPerHost: 10
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193 retryAutomatically: true
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194
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195
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196 logging:
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197
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198 formatters:
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199 basic:
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200 datefmt: '%Y-%m-%d %H:%M:%S'
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201 format: '%(asctime)s :: %(name)s :: %(levelname)s: %(message)s'
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202
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203 handlers:
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204 console:
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205 class: logging.StreamHandler
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206 formatter: basic
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207 level: custom
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208 stream: ext://sys.stderr
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209
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210 loggers:
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211 twisted:
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212 handlers:
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213 - console
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214 level: 0
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215
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216 root:
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217 handlers:
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218 - console
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219 level: custom
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220
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221 Note that unless there are many moderately wide and deep trees of data, which
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222 are expected to be read and edited by people, it might be preferrable to
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223 directly use PyYAML regardless, as it won't introduce another (rather pointless
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224 in that case) dependency and a point of failure.
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225
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226
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227 Some Tricks
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228 -----------
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229
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230 * Pretty-print any yaml or json (yaml subset) file from the shell::
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231
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232 % python -m pyaml /path/to/some/file.yaml
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233 % curl -s https://www.githubstatus.com/api/v2/summary.json | python -m pyaml
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234
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235 * Process and replace json/yaml file in-place::
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236
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237 % python -m pyaml -r file-with-json.data
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238
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239 * Easier "debug printf" for more complex data (all funcs below are aliases to
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240 same thing)::
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241
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242 pyaml.p(stuff)
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243 pyaml.pprint(my_data)
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244 pyaml.pprint('----- HOW DOES THAT BREAKS!?!?', input_data, some_var, more_stuff)
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245 pyaml.print(data, file=sys.stderr) # needs "from __future__ import print_function"
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246
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247 * Force all string values to a certain style (see info on these in
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248 `PyYAML docs`_)::
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249
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250 pyaml.dump(many_weird_strings, string_val_style='|')
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251 pyaml.dump(multiline_words, string_val_style='>')
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252 pyaml.dump(no_want_quotes, string_val_style='plain')
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253
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254 Using ``pyaml.add_representer()`` (note \*p\*yaml) as suggested in
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255 `this SO thread`_ (or `github-issue-7`_) should also work.
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256
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257 * Control indent and width of the results::
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258
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259 pyaml.dump(wide_and_deep, indent=4, width=120)
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260
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261 These are actually keywords for PyYAML Emitter (passed to it from Dumper),
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262 see more info on these in `PyYAML docs`_.
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263
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264 * Dump multiple yaml documents into a file: ``pyaml.dump_all([data1, data2, data3], dst_file)``
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265
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266 explicit_start=True is implied, unless explicit_start=False is passed.
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267
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268 .. _PyYAML docs: http://pyyaml.org/wiki/PyYAMLDocumentation#Scalars
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269 .. _this SO thread: http://stackoverflow.com/a/7445560
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270 .. _github-issue-7: https://github.com/mk-fg/pretty-yaml/issues/7
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271
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272
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273 Installation
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274 ------------
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275
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276 It's a regular package for Python (3.x or 2.x).
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277
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278 Module uses PyYAML_ for processing of the actual YAML files and should pull it
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279 in as a dependency.
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280
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281 Dependency on unidecode_ module is optional and should only be necessary if
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282 same-id objects or recursion is used within serialized data.
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283
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284 Be sure to use python3/python2, pip3/pip2, easy_install-... binaries below,
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285 based on which python version you want to install the module for, if you have
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286 several on the system (as is norm these days for py2-py3 transition).
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287
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288 Using pip_ is the best way::
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289
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290 % pip install pyaml
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291
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292 (add --user option to install into $HOME for current user only)
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293
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294 Or, if you don't have "pip" command::
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295
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296 % python -m ensurepip
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297 % python -m pip install --upgrade pip
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298 % python -m pip install pyaml
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299
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300 (same suggestion wrt "install --user" as above)
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301
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302 On a very old systems, one of these might work::
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303
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304 % curl https://bootstrap.pypa.io/get-pip.py | python
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305 % pip install pyaml
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306
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307 % easy_install pyaml
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308
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309 % git clone --depth=1 https://github.com/mk-fg/pretty-yaml
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310 % cd pretty-yaml
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311 % python setup.py install
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312
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313 (all of install-commands here also have --user option,
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314 see also `pip docs "installing" section`_)
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315
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316 Current-git version can be installed like this::
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317
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318 % pip install 'git+https://github.com/mk-fg/pretty-yaml#egg=pyaml'
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319
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320 Note that to install stuff to system-wide PATH and site-packages (without
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321 --user), elevated privileges (i.e. root and su/sudo) are often required.
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322
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323 Use "...install --user", `~/.pydistutils.cfg`_ or virtualenv_ to do unprivileged
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324 installs into custom paths.
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325
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326 More info on python packaging can be found at `packaging.python.org`_.
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327
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328 .. _ruamel.yaml: https://bitbucket.org/ruamel/yaml/
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329 .. _PyYAML: http://pyyaml.org/
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330 .. _unidecode: http://pypi.python.org/pypi/Unidecode
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331 .. _pip: http://pip-installer.org/
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332 .. _pip docs "installing" section: http://www.pip-installer.org/en/latest/installing.html
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333 .. _~/.pydistutils.cfg: http://docs.python.org/install/index.html#distutils-configuration-files
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334 .. _virtualenv: http://pypi.python.org/pypi/virtualenv
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335 .. _packaging.python.org: https://packaging.python.org/installing/
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336
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337