Description

• The import statements are scattered across most of the readers, lacking a clear organization.
• There are redundant, inconsistent, and unoptimized imports of same module in some readers.

Changes

• Grouping the imports into one of the following:
  • Standard Library imports
  • Third-Party Library imports
  • GeoIPS-based imports
• Move the import statements to the top of the file if they are inside a method that is definitely called each time.
• Move the import statement to the top of the file if they are located in the call() function, the primary function in each reader.
• Sorts the imports alphabetically within each group, adhering to PEP 8 standards
• Remove redundant import statements such as :
  • amsr2_netcdf.py had three instances of import xarray including in the primary function call()
  • amsr2_netcdf.py has two functions read_amsr_winds() and read_amsr_mbt(). One of the two is called and each one has same imports listed in their definition
• Some readers had numpy listed under standard libraries import which should be moved to Third-Party Library imports
• Fix inconsistent imports of the same module in a given reader

  import numpy 
  import numpy as np 
  

  import os 
  from os.path import basename
  

  from numpy import datetime64
  import numpy 
  

Does Not Change

This issue does not intend to change the following

• The imports handled through optional dependency checks have not been changed.

         with import_optional_dependencies(loglevel="info"):
              """Attempt to import a package and print to LOG.info if the import fails."""
              # If this reader is not installed on the system, don't fail alltogether, just skip
              # this import.  This reader will not work if the import fails and the package will
              # have to be installed to process data of this type.
              import netCDF4 as ncdf
              import numexpr as ne

• The GeoIPS-based imports, which are local and used for a specific function within the method, have not been modified to maintain the relevant context.

Background and Motivation

• Adhere to PEP 8 standards of imports organization to improve code readability and standardize imports.

Checklist for Completion

• make the changes across all the readers
• perform a full test to ensure successful validation