pandas allocate wrong dtype for json read code example

Example 1: pandas to json

>>> df.to_json(orient='records')
'[{"col 1":"a","col 2":"b"},{"col 1":"c","col 2":"d"}]'

Example 2: convert dataframe to json

dictionary_varibale = [ 
    dict([
        (colname, row[i]) 
        for i,colname in enumerate(df.columns)
    ])
    for row in df.values
]
print(json.dumps(dictionary_varibale))