Lec15WhileImages

Lec15WhileImages - Welcome Today 1 While loops vs for loops...

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Welcome!!! Today: 1) While loops vs for loops 2) Images!! Yippee!! Vocabulary: Definite Iteration – The number of iterations can be determined when the loop is encountered. (A for loop uses definite iteration – python only) Indefinite Iteration – the loop may iterate any number of times, dependent on a condition which must be continually checked. (this is what most loops are, while included) Infinite Loop – A loop whose condition never becomes false There are actually three parts to an indefinite iteration loop 1) Initialization – we set initial values to all variables used in the condition – this happens before we encounter the loop 2) condition – boolean expression used to determine whether the loop iterates again 3) change of state – within the loop, changing the variable values used in the condition name = input(“Please enter next name:”) # initialization while (not (name == ‘\n’)): # condition scoreList = gradebook[name] score = float(input(“Please enter score:”)) scoreList.append(score) gradebook[name] = scoreList
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