title: Inserting values from a dictionary in a pandas Dataframe
body: <p>I am new to data science and python. I am having trouble trying to fill values in columns of a table.</p>
  <p>There is a table with rows device_id, age, gender, group + other columns.</p>
  <p>I also have a dictionary consisting of device_id values as keys and a list of gender, age and group values {device_id: [gender, age, group]}</p>
  <p>I am trying to iterate through the table and check the device_id of each row against the key value in the dictionary. On match, I intend to to assign the values in the relevant columns.</p>
  <p>However I am not able to do that. Can someone show the way ahead??</p>
  <p>Thanks</p>