Lec24 update

...b_checkpoints/lec_23_function_references-checkpoint.ipynb

...ints/lec_23_function_references_template-checkpoint.ipynb

...s/23_Function_References/lec_23_function_references.ipynb

...tion_References/lec_23_function_references_template.ipynb

...ail_lecture_notes/24_Comprehensions/cs220_survey_data.csv

...cture_notes/24_Comprehensions/lec_24_comprehensions.ipynb

...ensions/lec_24_comprehensions_template_Gurmail_lec1.ipynb

...ensions/lec_24_comprehensions_template_Gurmail_lec2.ipynb