Python File Open Error
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you have probably seen some. There are (at least) two distinguishable kinds of errors: syntax errors and exceptions. 8.1. Syntax Errors¶ Syntax errors, also known syntax for generic except clause in python as parsing errors, are perhaps the most common kind of complaint you
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get while you are still learning Python: >>> while True print('Hello world') File "
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is caused by (or at least detected at) the token preceding the arrow: in the example, the error is detected at the function print(), since a colon (':') is missing before it. File name and line number are printed so you know where to look in case the input came from a script. 8.2. Exceptions¶ Even if a statement or expression name of errors in python is syntactically correct, it may cause an error when an attempt is made to execute it. Errors detected during execution are called exceptions and are not unconditionally fatal: you will soon learn how to handle them in Python programs. Most exceptions are not handled by programs, however, and result in error messages as shown here: >>> 10 * (1/0) Traceback (most recent call last): File "
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Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a syntax for raise clause in python minute: Sign up Python's “open()” throws different errors for “file not found” - how to handle both exceptions? up vote 29 down vote favorite 6 I have a script where a user is prompted to type a filename (of a file https://docs.python.org/3/tutorial/errors.html that is to be opened), and if the file doesn't exist in the current directory, the user is prompted again. Here is the short version: file = input("Type filename: ") ... try: fileContent = open(filename, "r") ... except FileNotFoundError: ... When I tested my script on my MacOS X in Python 3.3x it worked perfectly fine when I type the wrong filename on purpose (it executes the suite under "expect"). However, when I wanted to run my code on a Windows computer in http://stackoverflow.com/questions/15032108/pythons-open-throws-different-errors-for-file-not-found-how-to-handle-b Python 3.2x, I get an error that says that "FileNotFoundError" is not defined. So, Python 3.2 on Windows thinks "FileNotFoundError" is a variable and the programs quits with an error. I figured out that Python 3.2 on Windows throws an "IOError" if the input filename is not valid. I tested it on my Linux machine in Python 2.7, and it's also an IOError. My problem is now, that the code with except "FileNotFoundError": won't run on Windows's Python 3.2, but if I change it to except "IOError": it won't work on my Mac anymore. How could I work around it? The only way I can think of is to use just except, which I usually don't want. python python-3.x filenotfoundexception ioerror share|improve this question edited Feb 22 '13 at 19:57 asked Feb 22 '13 at 19:48 user2015601 6 This isn't due to Mac/Windows, it's the version of Python. I would investigate 3.2/3.3 on OS X as well (and 3.3 on Windows), consult the change logs, and then revise the question/title as appropriate. –user166390 Feb 22 '13 at 19:53 add a comment| 4 Answers 4 active oldest votes up vote 38 down vote accepted In 3.3, IOError became an alias for OSError, and FileNotFoundError is a subclass of OSError. So you might try except (OSError, IOError) as e: ... This will cast a pretty wide net, and you can't assume that the exception is "file not found" without inspecting e.errno, but it may cover
and get tips & solutions from a community of 418,626 IT Pros & Developers. It's quick & easy. how do you know if open failed? https://bytes.com/topic/python/answers/542290-how-do-you-know-if-open-failed P: n/a SpreadTooThin f = open('myfile.bin', 'rb') How do I know if there was an error opening my file? Sep 28 '06 #1 Post Reply Share this Question 5 Replies P: n/a tobiah SpreadTooThin wrote: f = open('myfile.bin', 'rb') How do I know if there was an error opening my file? try: open('noexist') except: print "Didn't open" -- Posted via a free Usenet account from http://www.teranews.com Sep 28 in python '06 #2 P: n/a Fredrik Lundh SpreadTooThin wrote: f = open('myfile.bin', 'rb') How do I know if there was an error opening my file? you'll notice: >>f = open("myfile.bin", "rb") Traceback (most recent call last): File "