Add to_dict functionality to make pandas conversion easier

[rsdefever]

From Parashara:

If someone did want to convert Elements to a pandas dataframe or other data structure, including a to_dictionary function in Elements which just returns a copy of the symbol_dict would make that easier. Or add element.symbol_dict to the init.py

[ahy3nz]

import element.element
import pandas as pd
import json

with open(element.element.JSON_PATH) as jsonfile:
    df = pd.DataFrame(json.load(jsonfile)).transpose()

print("Search by name")
print(df.set_index('name').loc['yttrium'])
print('\n')

print("Search by atomic number")
print(df.set_index('atomic number').loc[117])
print('\n')

print("Search by symbol")
print(df.set_index('symbol').loc["Rh"])
print('\n')       

Yields

Search by name
symbol                 Y
atomic number         39
mass             88.9059
Name: yttrium, dtype: object


Search by atomic number
name      ununseptium
symbol            Uus
mass              291
Name: 117, dtype: object


Search by symbol
name             rhodium
atomic number         45
mass             102.906
Name: Rh, dtype: object