changelog

# Change log

removed all references to jyputer notebooks

## Variables
* changed thing to atom_name in the last exercise

## Pandas data frames
* removed lambda exercise as these were never introduced and are never uesd again in the notes


## Functions 
* functions done after conditionals as there was lots of use of them in that section without prior explanation
* simplified Japan GDP example 

## Conditionals
* Changed Initializing exercise to checking for None
* 


## Wrap up

Extra links added

moved Using Functions With Conditionals in Pandas to functions


# Not changed, but should do

Lists exercise on negative indicies (How large is a slice). Wording is ambiguous, some more concerete examples would be helpful.

Looping over datasets, minimum file size exercise, introduces inf and requires it as an answer but has never defined this.

functions exercise, data used in pandas doesn't exist get it from https://www.gapminder.org/data/