Class 42 — April 29

I know that you know that

Programming basics — You achieved this semester — Bask in the success

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Look both ways

• Back and ahead

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Agenda

• Be chrestohistorical

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Notices

• TA-lead review in Olsson 120 on Wednesday starting at 2 PM.

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Thanks to the undergraduate TAs for making the course successful

Raven Chen	Ryan Green	Jacob St. Martin	Shelby Slotter
Ann Hoang	Nadia Hassan	Nikki Pope	Alexandra Stampfl
Vienna Donnelly	Peter Haynes	Sophia Rogers	Hannah Thompson
Jessica Emmons	Jessica Krynitsky	Leah Salvano	Torian Wright

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Links

• Test 1 artifacts are available

• Test 2 artifacts are available

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Important patterns

• Print output

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• Get input

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• Convert input to data

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• Perform calculations

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• Process strings

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• Get web input

• Use to do above and below tasks

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• Examine and create lists

• Convert a string into a list of strings

• Convert a list of strings into a list of numbers

• Perform an accumulation

• Build a string, list, or sum

• Check to see if the elements of the list are all of the same form

• Check to see if any element of the list has a desired form.

• Find first / last index of an item with a property

• Compare two lists

• Synthesize two lists

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• Generate random data

• Get a random value from a range

• Select a random element from a list

• Produce a random tuple

• Produce random lists and tables

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• CSV data

• Convert a list of CSV-strings into a new list of lists

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• Examine and create dictionaries

• Convert a list of tuples into a dictionary

• Convert a list of two-element lists into a dictionary

• Examine a list with respect to a dictionary

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• Examine a table

• Perform an accumulation

• Process a table on a row by row basis

• Convert cells from strings to numerics

• Check to see if all data cells in the table are of the same form

• Check to see if any data cells in the table are of the desired form

• Check to see if all rows in the table are of the same form

• Check to see if any rows in the table are of the desired form

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• Design, implement, analyze functions that can encapsulate the above tasks

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• Photo manipulation

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Realizations

• A variable has an identity and a type

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• The value of a variable indicates where the object which it represents can be found

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• Strings are immutable

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• Converting string data to numeric data.

• To hand back a single integer value nbr from a single numeric representation v

nbr = int( v )

• To hand back a list of integer values nbrs from a string list strings

nbrs = []

for v in s :

  nbr = int( v )

  nbrs.append( nbr )

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• A function invocation cannot change the identity of an argument

• All functions return a value either explicitly or implicitly. If there is no explicit return, None is returned.

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Truisms

• The test will cummulative.

• Questions can require in part familiarity with

• Fundamental types; e.g., int, float, and str

• Arithmetic operators; e.g., +, -, *, **, /, //, and %

• Identifiers, keywords, variables, objects, values, and references

• Logical and relational operators; and, or, not, ==, !=, <, >, <=, and >=

• Control constructs; e.g., if, for, and while

• Nested for constructs

• Random value manipulation

• random.seed()

• random.randrange()

• random.choice()

• Builtin-in functions; e.g., print(), input(), int(), float(), str(), max(), min(), len(), type(), and id()

• URLs and web files; e.g., numeric, text and CSV contents

• Ranges

• Data structures and their use: list, dict, tuples, methods and slicing

• Functions, parameters, definitions, and invocations

• Colors and PIL Image

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Final thought

• I say thanks to you — Your presence is a great gift — Brings me happiness