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Project description

JMESPath

JMESPath (pronounced "james path") allows y'all to declaratively specify how to extract elements from a JSON document.

For example, given this certificate:

{"foo": {"bar": "baz"}}            

The jmespath expression foo.bar will return "baz".

JMESPath also supports:

Referencing elements in a list. Given the data:

{"foo": {"bar": ["one", "2"]}}            

The expression: foo.bar[0] will render "one". You tin too reference all the items in a list using the * syntax:

{"foo": {"bar": [{"name": "one"}, {"name": "two"}]}}            

The expression: foo.bar[*].name will return ["ane", "two"]. Negative indexing is too supported (-one refers to the concluding element in the list). Given the data above, the expression foo.bar[-1].name will render "2".

The * tin can too be used for hash types:

{"foo": {"bar": {"proper noun": "one"}, "baz": {"name": "two"}}}            

The expression: foo.*.name will return ["one", "2"].

Installation

You tin can install JMESPath from pypi with:

pip install jmespath            

API

The jmespath.py library has two functions that operate on python information structures. You tin use search and give it the jmespath expression and the data:

              >>>              import              jmespath              >>>              path              =              jmespath              .              search              (              'foo.bar'              ,              {              'foo'              :              {              'bar'              :              'baz'              }})              'baz'            

Similar to the re module, you can utilise the compile office to compile the JMESPath expression and use this parsed expression to perform repeated searches:

              >>>              import              jmespath              >>>              expression              =              jmespath              .              compile              (              'foo.bar'              )              >>>              expression              .              search              ({              'foo'              :              {              'bar'              :              'baz'              }})              'baz'              >>>              expression              .              search              ({              'foo'              :              {              'bar'              :              'other'              }})              'other'            

This is useful if yous're going to utilise the same jmespath expression to search multiple documents. This avoids having to reparse the JMESPath expression each fourth dimension you search a new document.

Options

You can provide an instance of jmespath.Options to command how a JMESPath expression is evaluated. The most common scenario for using an Options instance is if you lot want to have ordered output of your dict keys. To exercise this you can use either of these options:

                >>>                import                jmespath                >>>                jmespath                .                search                (                '{a: a, b: b}'                ,                ...                mydata                ,                ...                jmespath                .                Options                (                dict_cls                =                collections                .                OrderedDict                ))                >>>                import                jmespath                >>>                parsed                =                jmespath                .                compile                (                '{a: a, b: b}'                )                >>>                parsed                .                search                (                mydata                ,                ...                jmespath                .                Options                (                dict_cls                =                collections                .                OrderedDict                ))              

Custom Functions

The JMESPath language has numerous built-in functions, but it is also possible to add your ain custom functions. Keep in mind that custom function support in jmespath.py is experimental and the API may modify based on feedback.

If you take a custom function that you lot've institute useful, consider submitting it to jmespath.site and propose that information technology be added to the JMESPath language. You can submit proposals here.

To create custom functions:

• Create a subclass of jmespath.functions.Functions.
• Create a method with the name _func_<your part name>.
• Apply the jmespath.functions.signature decorator that indicates the expected types of the role arguments.
• Provide an instance of your subclass in a jmespath.Options object.

Below are a few examples:

                  import                  jmespath                  from                  jmespath                  import                  functions                  # i. Create a subclass of functions.Functions.                  #    The role.Functions base class has logic                  #    that introspects all of its methods and automatically                  #    registers your custom functions in its function table.                  form                  CustomFunctions                  (                  functions                  .                  Functions                  ):                  # two and iii.  Create a function that starts with _func_                  # and decorate information technology with @signature which indicates its                  # expected types.                  # In this instance, we're creating a jmespath role                  # called "unique_letters" that accepts a unmarried argument                  # with an expected blazon "string".                  @functions                  .                  signature                  ({                  'types'                  :                  [                  'cord'                  ]})                  def                  _func_unique_letters                  (                  self                  ,                  south                  ):                  # Given a string southward, return a sorted                  # string of unique letters: 'ccbbadd' ->  'abcd'                  return                  ''                  .                  join                  (                  sorted                  (                  set                  (                  s                  )))                  # Here's another example.  This is creating                  # a jmespath function called "my_add" that expects                  # two arguments, both of which should exist of type number.                  @functions                  .                  signature                  ({                  'types'                  :                  [                  'number'                  ]},                  {                  'types'                  :                  [                  'number'                  ]})                  def                  _func_my_add                  (                  self                  ,                  10                  ,                  y                  ):                  return                  10                  +                  y                  # 4. Provide an instance of your subclass in a Options object.                  options                  =                  jmespath                  .                  Options                  (                  custom_functions                  =                  CustomFunctions                  ())                  # Provide this value to jmespath.search:                  # This will print three                  print                  (                  jmespath                  .                  search                  (                  'my_add(`one`, `two`)'                  ,                  {},                  options                  =                  options                  )                  )                  # This will impress "abcd"                  impress                  (                  jmespath                  .                  search                  (                  'foo.bar | unique_letters(@)'                  ,                  {                  'foo'                  :                  {                  'bar'                  :                  'ccbbadd'                  }},                  options                  =                  options                  )                  )                

Again, if you come up with useful functions that you think brand sense in the JMESPath language (and make sense to implement in all JMESPath libraries, not just python), delight let united states of america know at jmespath.site.

Testing

In improver to the unit of measurement tests for the jmespath modules, there is a tests/compliance directory that contains .json files with examination cases. This allows other implementations to verify they are producing the correct output. Each json file is grouped past feature.

Hash out

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Source Distribution

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Source: https://pypi.org/project/jmespath/

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