By Virginia Evans, Jenny Dooley

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3): ... print("hello") ... 000): ... print("goodbye") ... 000000000000000000001): ... print("hello") ... hello if can determine if a list is empty, as seen in the checkSeq() function shown in the first example below. The result is shown in the second example. Remember, an empty list indicates false. >>> def checkSeq(seq): ... if (seq): ... print "has item" ... else : ... print "empty" ... >>> non_empty_list = [1,2,3] >>> empty_list = [] >>> checkSeq(empty_list) empty >>> checkSeq(non_empty_list) has item Typically, if statements contain expressions that use comparison and logical operators.

Python string formatting controls the creation of strings. Done correctly, it makes the production of these strings simple and straightforward. I've said it before, and I'll say it again: If you're a beginning programmer, remember that the only way to learn programming is by programming, so try to follow along with the interactive sessions throughout the chapter. The interactive interpreter mode will give you a hands-on understanding of Python operators and string formatting. If you have trouble with an Advanced Topic section, just skim over it; don't let it slow you down.

Consider the following interactive session: >>> print ("She said, \"I love you \" and I said \n \"remember Paris in the spring") #one line She said, "I love you " and I said "remember Paris in the spring >>> Python has another way, and this is where the different quoting styles come in handy. Strings that use triple-double or triple-single quotes can span multiple lines and include actual quoted lines within them. That means that the previous example can be rewritten as >>> print ("""She said, "I love you", and I said, ...

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