Convert DataFrame in Json , add column name as shown in desired output skill and suggestion after that saved as it is in MongoDB collection

Python Pandas DataFrame is as input

    0     1     2       3       4       5       6       7
java    hadoop  java    hdfs    c       c++     php     python   html

c       c       c++     hdfs    python  hadoop  java    php      html

c++     c++     c       python  hdfs    hadoop  java    php      html

hadoop  hadoop  java    hdfs    c       c++     php     python   html

hdfs    hdfs    hadoop  java    c       c++     python  php      html

python  python  c++     html    c       php     hdfs    hadoop   java

Desired Output saved into MongoDB collection as

{ "_id" : ObjectId("5922a781205a763b55e2e90e"), "skill" : "java", "suggestions" : [ "hadoop", "java", "hdfs", "c", "c++", "php", "python", "html" ] }

{ "_id" : ObjectId("5922a781205a763b55e2e91e"), "skill" : "c", "suggestions" : [ "c", "c++", "hdfs", "python", "hadoop", "java", "php", "html" ] }

{ "_id" : ObjectId("5922a781205a763b55e2e92e"), "skill" : "c++", "suggestions" : [ "c++", "c", "python", "hdfs", "hadoop", "java", "php", "html" ] }

{ "_id" : ObjectId("5922a781205a763b55e2e93e"), "skill" : "hadoop", "suggestions" : [ "hadoop", "java", "hdfs", "c", "c++", "php", "python", "html" ] }