Class 7 – Wednesday, January 29

Make Bill Murray proud

Take another step — Chrestomathics awaits you — Feel the momentum

All Hoos got your back — A single community — In it together

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Look both ways

• Back or ahead

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Survey

• Please take it right now

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Is a rose by any other name still a rose

• Variable naming for HW 06 computation

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Agenda

• Continues introduction to the string type str

• Changes the past

• Continue exploration of the basics of problem solving — getting data, performing computation, and displaying information. Along the way we will develop an appreciation for expression evaluation and formulation

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Downloads

• Program combine_multiply.py

• Program lickety_strip_and_split.py

• Program subscripting.py

• Program love_is_all_you_need.py

• Program break_the_bank.py

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Office hours

Times TBD

Location Thornton A Stacks

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To do list

• Review class artifacts

• Finish homework

• Check out other Python built-in functions

• Reread about Python string capabilities.

• Reread problem-solving epistle

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Program subscripting.py

• Explores selecting an individual character from a string — subscripting

• Introduces indexes.

Program output

### [] is the string index operator

s = obliviator

  0123456789

n = len( s ) = 10

### If the [] operand is an integer value, it is subscripting

s[ 0 ] = o

s[ 4 ] = v

s[ n-1 ] = r

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Program love_is_all_you_need.py

• Prints the adage Love is all you need the requested number of times

Some program runs

Enter number of lines to be printed: 5

Love is all you need

Love is all you need

Love is all you need

Love is all you need

Love is all you need

Enter number of lines to be printed: 1

Love is all you need

Enter number of lines to be printed: 0

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Program temperature.py

• Prompts user for a integer Celsius temperature and separately computes its integer and decimal Fahrenheit equivalent using the formula

• Two different possible runs

Enter Celsius temperature: 24

24 C = 75.2 F

24 C = 75 F

Enter Celsius temperature: 8

8 C = 46.4 F

8 C = 46 F

 

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Program break_the_bank.py

• With a single prompt, it gets from the user four values in the following order: number of quarters, dimes, nickels, and pennies. Computes and displays how much the coinage is worth.

• Two different possible runs

Number of quarters, dimes, nickels, and pennies: 27 14 28 18

Coinage

    27 quarters

    14 dimes

    28 nickels

    18 pennies

are worth 9.73 dollars

Number of quarters, dimes, nickels, and pennies: 1 2 3 4

Coinage

    1 quarters

    2 dimes

    3 nickels

    4 pennies

are worth 0.6400000000000001 dollars

• For those who dislike Python's approximation in the second test run, consider the built-in round() function.

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© 2020 Jim Cohoon

Resources from previous semesters are available.