Lists

A list is

• a single variable and its value
• an ordered list of values with one name
• a list of values, each with a different variable name
• an unordered set of values

The lowest value in a list

• is at index position 0
• is at index position 1
• is at index position "zero"
• is at index position "one"

To access the second value in the fred[ ] list, you would use

• fred[1]
• fred[2]
• fred(2)
• fred:2

To get the number of values in the fred[ ] list, use

• len(fred)
• length(fred)
• fred[length]
• fred_length

To create an empty list:

• MyList = [ ]
• Mylist = [ empty ]
• new(myList)
• MyList= 0

MyList[4] = "Fred"

• only if position 4 already has a value
• is always possible
• only if position 4 already holds a String
• is impossible

To add a value to a list, do

• MyList,append(5)
• MyList.grow(5)
• MyList = MyList + 5
• MyList[ end ] = 5

To print out all the values in MyList:

• for x in MyList:<br /> print(x)
• print(MyList)
• print(all of MyList)
• this is impossible

The best type of loop to use on a list is

• a FOR loop
• a WHILE loop
• an IF statement
• a print() statement

Can a value in a list be overwritten with a new value?

• Yes
• No
• Only if it's a number
• Only if it's a String