Homework

Try out these exercises at home. These are just examples. Try to find some more examples in the internet or just play around!

• Which Python version are you using?
• What is the type of an error that occurs when:
  • You are quoring only one side of a string? (SyntaxError)
  • You are trying to subtract a number from a string?
  • You divide by zero?
  • You try to use a variable that does not exist?
  • You press Ctrl+C when a program asks for input (using the input function)?
  • You put a space or tab before a statement?
  • You do not close parenthesis?
  • You are trying to use an exclamation mark as an operator
• What error occurs when you're trying to assign a string to a string?
• Not everything can be used as a variable name. Try the following, which ones can not be used as variable names? Why?
  • x,
  • button4,
  • 34,
  • 3e4,
  • turkey,
  • $i,
  • square-root,
  • readme,
  • readme.txt,
  • shorterEdge,
  • shorter_edge,
  • NUMBER_OF_POINTS,
  • _,
  • π,
  • True,
  • _cache,
  • __name__,
  • while.
• Some of the names above are valid, but not very good variable names. Which ones do you think are those?
• Which one of shorterEdge, shorter_edge is a more correct name for a variable? Why? Try searching for PEP 8 variable names. What's a PEP 8?
• Try to write a program that calculates the surface and volume of a cube with edge = 2852 cm.
• Now change the program so that the user can enter the edge value.