ChenglinXie

I guess you mean "sequence" not "sequennce"

I guess you mean "subspecies", because there is no word about "subpieces"

I guess use " , i " may be more clear than " + str(i) "

Add comment to illustrate the difference between an element in a list and a key

Give more information about formatting numbers for printing to better understand

Add notes in the section: Abbreviated Assignment 1.Add notes to better illustrate what "//" does 2.And I think the output of here is wrong. Because original x(dividend) is 9.5, x...

A minor typo fix: Change "the loop and evalute" to "the loop and evaluate"

A minor grammar fix: Change "or equals to y" to "or equal to y"

A minor typo fix: Change"towards" to "toward"

A minor grammar fix: Change "learned to program another language" to "learned to program in another language"