>>> seeds += 5 Traceback (most recent call last): TypeError: 'int' object is not iterable in Java

Make UPC-A in Java >>> seeds += 5 Traceback (most recent call last): TypeError: 'int' object is not iterable
>>> seeds += 5 Traceback (most recent call last): TypeError: 'int' object is not iterable
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415
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The correct way to extend a list is to use an iterable object, such as a list:
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>>> seeds += [5] >>> seeds ['sesame', 'sunflower', 'pumpkin', 5]
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And of course, the iterable object used to extend the list can itself have more than one item:
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>>> seeds += [9, 1, 5, "poppy"] >>> seeds ['sesame', 'sunflower', 'pumpkin', 5, 9, 1, 5, 'poppy']
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Appending a plain string for example, "durian" rather than a list containing a string, ["durian"], leads to a logical but perhaps surprising result:
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>>> seeds = ["sesame", "sunflower", "pumpkin"] >>> seeds += "durian" >>> seeds ['sesame', 'sunflower', 'pumpkin', 'd', 'u', 'r', 'i', 'a', 'n']
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The list += operator extends the list by appending each item of the iterable it is provided with; and since a string is an iterable, this leads to each character in the string being appended individually If we use the list append() method, the argument is always added as a single item
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Piece #7: Input/Output
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To be able to write genuinely useful programs we must be able to read input for example, from the user at the console, and from les and produce output, either to the console or to les We have already made use of Python s built-in print() function, although we will defer covering it further until Chap-
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1 Rapid Introduction to Procedural Programming
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ter 4 In this subsection we will concentrate on console I/O, and use shell redirection for reading and writing les Python provides the built-in input() function to accept input from the user This function takes an optional string argument (which it prints on the console); it then waits for the user to type in a response and to nish by pressing Enter (or Return) If the user does not type any text but just presses Enter, the input() function returns an empty string; otherwise, it returns a string containing what the user typed, without any line terminator Here is our rst complete useful program; it draws on many of the previous pieces the only new thing it shows is the input() function:
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print("Type integers, each followed by Enter; or just Enter to finish") total = 0 count = 0 while True: line = input("integer: ") if line: try: number = int(line) except ValueError as err: print(err) continue total += number count += 1 else: break if count: print("count =", count, "total =", total, "mean =", total / count)
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Book s examples 3
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The program (in le sum1py in the book s examples) has just 17 executable lines Here is what a typical run looks like:
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Type integers, each followed by Enter; or just Enter to finish number: 12 number: 7 number: 1x invalid literal for int() with base 10: '1x' number: 15 number: 5 number: count = 4 total = 39 mean = 975
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Although the program is very short, it is fairly robust If the user enters a string that cannot be converted to an integer, the problem is caught by an
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Python s Beautiful Heart
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exception handler that prints a suitable message and switches control to the start of the loop ( continues the loop ) And the last if statement ensures that if the user doesn t enter any numbers at all, the summary isn t output, and division by zero is avoided File handling is fully covered in 7; but right now we can create les by redirecting the print() functions output from the console For example:
C:\>testpy > resultstxt
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will cause the output of plain print() function calls made in the ctitious testpy program to be written to the le resultstxt This syntax works in the Windows console (usually) and in Unix consoles For Windows, we must write C:\Python31\pythonexe testpy > resultstxt if Python 2 is the machine s default Python version or if the console exhibits the le association bug; otherwise, assuming Python 3 is in the PATH, python testpy > resultstxt should be suf cient, if plain testpy > resultstxt doesn t work For Unixes we must make the program executable (chmod +x testpy) and then invoke it by typing /testpy unless the directory it is in happens to be in the PATH, in which case invoking it by typing testpy is suf cient Reading data can be achieved by redirecting a le of data as input in an analogous way to redirecting output However, if we used redirection with sum1py, the program would fail This is because the input() function raises an exception if it receives an EOF (end of le) character Here is a more robust version (sum2py) that can accept input from the user typing at the keyboard, or via le redirection:
print("Type integers, each followed by Enter; or ^D or ^Z to finish") total = 0 count = 0 while True: try: line = input() if line: number = int(line) total += number count += 1 except ValueError as err: print(err) continue except EOFError: break if count: print("count =", count, "total =", total, "mean =", total / count)