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Since we must read in an argument from the command line (the number to output), we need to access the sysargv list, so we begin by importing the sys module We represent each number as a list of strings For example, here is zero:
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Zero = [" *** ", " * * ", "* *", "* *", "* *", " * * ", " *** "]
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One detail to note is that the Zero list of strings is spread over multiple lines Python statements normally occupy a single line, but they can span multiple lines if they are a parenthesized expression, a list, set, or dictionary literal, a function call argument list, or a multiline statement where every end-of-line character except the last is escaped by preceding it with a backslash (\) In all these cases any number of lines can be spanned and indentation does not matter for the second and subsequent lines Each list representing a number has seven strings, all of uniform width, although what this width is differs from number to number The lists for the other numbers follow the same pattern as for zero, although they are laid out for compactness rather than for clarity:
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One = [" * ", "** ", " * ", " * ", " * ", " * ", "***"] Two = [" *** ", "* *", "* * ", " * ", " * ", "* # Nine = [" ****", "* *", "* *", " ****", " *", " ", "*****"] *", " *"]
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The last piece of data we need is a list of all the lists of digits:
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Digits = [Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine]
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We could have created the Digits lists directly, and avoided creating the extra variables For example:
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Digits = [ [" *** ", " * * ", "* *", "* *", "* *", " * * ", " *** "], # Zero [" * ", "** ", " * ", " * ", " * ", " * ", "***"], # One # [" ****", "* *", "* *", " ****", " *", " *", " *"] # Nine ]
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We preferred to use a separate variable for each number both for ease of understanding and because it looks neater using the variables We will quote the rest of the code in one go so that you can try to gure out how it works before reading the explanation that follows
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try: digits = sysargv[1] row = 0 while row < 7: line = "" column = 0 while column < len(digits): number = int(digits[column]) digit = Digits[number] line += digit[row] + " " column += 1 print(line) row += 1 except IndexError: print("usage: bigdigitspy <number>") except ValueError as err: print(err, "in", digits)
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The whole code is wrapped in an exception handler that can catch the two things that can go wrong We begin by retrieving the program s command-line argument The sysargv list is 0-based like all Python lists; the item at index position 0 is the name the program was invoked as, so in a running program this list always starts out with at least one item If no argument was given we will be trying to access the second item in a one-item list and this will cause an IndexError exception to be raised If this occurs, the ow of control is immediately switched to the corresponding exception-handling block, and there we simply print the program s usage Execution then continues after the end of the try block; but there is no more code, so the program simply terminates If no IndexError occurs, the digits string holds the command-line argument, which we hope is a sequence of digit characters (Remember from Piece #2 that identi ers are case-sensitive, so digits and Digits are different) Each big digit is represented by seven strings, and to output the number correctly we must output the top row of every digit, then the next row, and so on, until all seven rows have been output We use a while loop to iterate over each row We could just as easily have done this instead: for row in (0, 1, 2, 3, 4, 5, 6): and later on we will see a much better way using the built-in range() function We use the line string to hold the row strings from all the digits involved Then we loop by column, that is, by each successive character in the command-line argument We retrieve each character with digits[column] and convert the digit to an integer called number If the conversion fails a ValueError exception is raised and the ow of control immediately switches to the corresponding exception handler In this case we print an error message, and control resumes after the try block As noted earlier, since there is no more code at this point, the program will simply terminate
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