class_docstr: Performs cartographic transformations. Converts from
  longitude, latitude to native map projection x,y coordinates and
  vice versa using PROJ (https://proj.org).
  
  Attributes
  ----------
  srs: str
      The string form of the user input used to create the Proj.
  crs: pyproj.crs.CRS
      The CRS object associated with the Proj.
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docstr: Returns formal definition string for projection
  
  >>> Proj("EPSG:4326").definition_string()
  'proj=longlat datum=WGS84 no_defs ellps=WGS84 towgs84=0,0,0'
docstr_tok: ["Returns","formal","definition","string","for","projection",">",">",">","Proj","(","``","EPSG:4326","''",")",".definition_string","(",")","'proj=longlat","datum=WGS84","no_defs","ellps=WGS84","towgs84=0,0,0","'"]
code: def definition_string(self) -> str:
      """Returns formal definition string for projection
  
      >>> Proj("EPSG:4326").definition_string()
      'proj=longlat datum=WGS84 no_defs ellps=WGS84 towgs84=0,0,0'
      """
      return self.definition
  
file_path: pyproj/pyproj/proj.py
imports: import re
  import warnings
  from typing import Any
  from pyproj._compat import cstrencode
  from pyproj._transformer import Factors
  from pyproj.crs import CRS
  from pyproj.enums import TransformDirection
  from pyproj.list import get_proj_operations_map
  from pyproj.transformer import Transformer, TransformerFromPipeline
  from pyproj.utils import _convertback, _copytobuffer
label_desc: Use image node_id 4 for calling the Proj obj's underlying member method code with example usage: obj.definition_string() and returns: self