Add support for fastidentity searchtype to enhance search capabilities #43
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…ssing the operation value enables PubChemPy to execute a fast identity search with POST. The original response = request() statement was put into the else clause of the if statement.
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The PubChem REST API fastidentity searchtype includes support for search by SMILES string to identify multiple stereoisomers of the same canonical SMILES string. A simple if: else: construct was added to the PubChemPy get() function to pass the operation value, thus enabling synchronous ("fast") input searches. (https://pubchemdocs.ncbi.nlm.nih.gov/pug-rest).
This was tested for the get_compounds() and get_cids() functions and found to perform as expected to return multiple isomers by canonical SMILES search.
PubChem "fast" searches cover several types, in addition to the fastidentity search, and may similarly be supported by changing the equality test to a test for presence of the searchtype in a list. This is beyond the scope of this pull request but may require little effort to implement.
The code change preserves the original result = request() expression in the else: clause and places the modified call, which includes the operation (in place of None in the original call), in the if (True): clause.