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The while statement tests the conditional expression that immediately follows If the tested statement is true, the body of the while statement executesThe condition is then retested and the body executed again until the condition becomes false Because the body of the loop is denoted by indentation, the three statements following while in Listing 11 execute on each iteration Python doesn t specify the amount of required indentation, as long as it s consistent within a block However, it is most common (and generally recommended) to use four spaces per indentation level One problem with the program in Listing 11 is that the output isn t very prettyTo make it better, you could right-align the columns and limit the precision of principal to two digitsThere are several ways to achieve this formattingThe most widely used approach is to use the string formatting operator (%) like this:
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print "%3d %02f" % (year, principal) print("%3d %02f" % (year, principal)) # Python 3
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Now the output of the program looks like this:
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Format strings contain ordinary text and special formatting-character sequences such as "%d", "%s", and "%f"These sequences specify the formatting of a particular type of data such as an integer, string, or floating-point number, respectivelyThe specialcharacter sequences can also contain modifiers that specify a width and precision For example, "%3d" formats an integer right-aligned in a column of width 3, and "%02f" formats a floating-point number so that only two digits appear after the decimal point The behavior of format strings is almost identical to the C printf() function and is described in detail in 4, Operators and Expressions A more modern approach to string formatting is to format each part individually using the format() function For example:
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print format(year,"3d"),format(principal,"02f") print(format(year,"3d"),format(principal,"02f")) # Python 3
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format() uses format specifiers that are similar to those used with the traditional string formatting operator (%) For example, "3d" formats an integer right-aligned in a column of width 3, and "02f" formats a float-point number to have two digits of accuracy Strings also have a format() method that can be used to format many values at once For example:
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print "{0:3d} {1:02f}"format(year,principal) print("{0:3d} {1:02f}"format(year,principal)) # Python 3
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In this example, the number before the colon in "{0:3d}" and "{1:02f}" refers to the associated argument passed to the format() method and the part after the colon is the format specifier
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The if and else statements can perform simple tests Here s an example:
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if a < b: print "Computer says Yes" else: print "Computer says No"
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The bodies of the if and else clauses are denoted by indentationThe else clause is optional To create an empty clause, use the pass statement, as follows:
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if a < b: pass # Do nothing else: print "Computer says No"
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You can form Boolean expressions by using the or, and, and not keywords:
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if product == "game" and type == "pirate memory" \ and not (age < 4 or age > 8): print "I'll take it!"
Note
Writing complex test cases commonly results in statements that involve an annoyingly long line of code To improve readability, you can continue any statement to the next line by using a backslash (\) at the end of a line as shown If you do this, the normal indentation rules don t apply to the next line, so you are free to format the continued lines as you wish
Python does not have a special switch or case statement for testing valuesTo handle multiple-test cases, use the elif statement, like this:
if suffix == "htm": content = "text/html" elif suffix == "jpg": content = "image/jpeg" elif suffix == "png": content = "image/png" else: raise RuntimeError("Unknown content type")
To denote truth values, use the Boolean values True and False Here s an example: