Difference between revisions of "Scope exercises"
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(Created page with "''Variable scope'' --Exercise A-- Copy the following code: <syntaxhighlight lang="Python"> # obtain last name from user def getLastName(): last_name=raw_input("What's your ...") |
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--Exercise A-- | --Exercise A-- | ||
− | + | Fix the following buggy code: | |
<syntaxhighlight lang="Python"> | <syntaxhighlight lang="Python"> | ||
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* Define two variables, 'x' and 'screen_width' | * Define two variables, 'x' and 'screen_width' | ||
* Set screen_width to 800 | * Set screen_width to 800 | ||
− | * Ask the user for 'x' | + | * Ask the user for a value for 'x' |
− | * Write a function that performs | + | * Write a function that performs screen wrapping(as in 'Robot'): |
If the input is greater than screen width, set it to 0 | If the input is greater than screen width, set it to 0 | ||
If the input is less than 0 then set it to the screen width | If the input is less than 0 then set it to the screen width | ||
− | * Add code to print x before and after the function is called | + | * Add code to print 'x' before and after the function is called |
− | * Test the code with several sample values | + | * Test the code with several sample values - make sure it works. |
* Extend the wrapping function so that it also works with the y-coordinate | * Extend the wrapping function so that it also works with the y-coordinate | ||
− | * | + | ** Don't create a second function. Instead work out how to return two variables. |
Revision as of 22:05, 27 February 2011
--Exercise A-- Fix the following buggy code:
# obtain last name from user
def getLastName():
last_name=raw_input("What's your last name?")
# create a full name from the first and last names
def combineName():
full_name=first_name+" "+last_name
print_name()
#Print user's name
def print_name():
print "User's full name:"+full_name
first_name=raw_input("What's your first name?")
getLastName()
combineName()
- What is the scope of the following variables
- last_name
- first_name
- full_name?
- Ensure last_name is transferred from getLastName() to the default scope
- What argument needs to be passed to print_name()?
- Add a new function that asks "Are you (j)junior, (s)senior or (n) neither?", and determines the correct suffix ("Jr.", "Sr.")
- Modify the combineName function so the suffix is added to full_name
--Exercise B--
- Create a new program
- Define two variables, 'x' and 'screen_width'
- Set screen_width to 800
- Ask the user for a value for 'x'
- Write a function that performs screen wrapping(as in 'Robot'):
If the input is greater than screen width, set it to 0 If the input is less than 0 then set it to the screen width
- Add code to print 'x' before and after the function is called
- Test the code with several sample values - make sure it works.
- Extend the wrapping function so that it also works with the y-coordinate
- Don't create a second function. Instead work out how to return two variables.