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or written to a file for future use. This chapter will discuss some of the possibilities. 7.1. Fancier Output Formatting¶ python exception class So far we've encountered two ways of writing values: expression statements python exception message and the print statement. (A third way is using the write() method of file objects; the python custom exception standard output file can be referenced as sys.stdout. See the Library Reference for more information on this.) Often you'll want more control over the formatting of your output python exception stack trace than simply printing space-separated values. There are two ways to format your output; the first way is to do all the string handling yourself; using string slicing and concatenation operations you can create any layout you can imagine. The string types have some methods that perform useful operations for padding strings to a given column width; these will be

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discussed shortly. The second way is to use the str.format() method. The string module contains a Template class which offers yet another way to substitute values into strings. One question remains, of course: how do you convert values to strings? Luckily, Python has ways to convert any value to a string: pass it to the repr() or str() functions. The str() function is meant to return representations of values which are fairly human-readable, while repr() is meant to generate representations which can be read by the interpreter (or will force a SyntaxError if there is no equivalent syntax). For objects which don't have a particular representation for human consumption, str() will return the same value as repr(). Many values, such as numbers or structures like lists and dictionaries, have the same representation using either function. Strings and floating point numbers, in particular, have two distinct representations. Some examples: >>> s = 'Hello, world.' >>> str(s) 'Hello, world.' >>> repr(s) "'Hello, world.'" >>> str(1.0/7.0) '0.142857142857

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Python Print Exception

about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users python file open Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping python catch multiple exceptions each other. Join them; it only takes a minute: Sign up Exception handling in python file i/O up vote 0 down vote favorite Python newbie here and am running into some weird behavior in my code. I am trying https://docs.python.org/2/tutorial/inputoutput.html to write some data to a file. I print the length of the data to be about 50k before I call the following block of code. The data is a pdf file I got over the internet. And its a valid pdf. When I call the function F() described below, I get the exception message printed in function F and not in the actual place it fails. In the code below, in the function write_to_disk() I see http://stackoverflow.com/questions/19319752/exception-handling-in-python-file-i-o the second print and the execution directly jumps to the exception handler in the calling function F(). I cannot figure out why this is happening. On disk I see the file is created but the size is 0. Can some look at the code below and may be guess what could be happening? If I am catching exceptions in the write_to_disk() function how is it possible for it to jump out of the function completely? EDIT: Thanks for kobejohn, turns out the excetion object does not have a errno variable. Getting rid of it made the print appear. But the bigger problem still exists. I see a failure with no way to find out why its failing. How do I get the error message here? def write_to_disk(self, pathToWrite, pdfFileData): try: print 'Here `1.1' fd = open(pathToWrite, "w+") print 'Here `2.1' fd.write(pdfFileData) print 'Here 3.1' fd.close() except Exception as e: print 'file cannot be opened ' + pathToWrite + e.errno This function is inturn called by another function F which is like this - def F(self, url): pathWrite = get_path_to_use() pdfData = get_pdf_data(url) try: writetodisk(pathToWrite, pdfData) except Exception as e: print 'Did I jump directly to here?' + e.errno Here is the out put of the program. I did not think it will add anything because I see nothing if any use. In fact I get the same output eve

Python - Basic Syntax Python - Variable Types Python - Basic Operators Python - Decision Making Python - Loops Python - Numbers Python - Strings Python - Lists Python - Tuples Python - Dictionary Python - Date http://www.tutorialspoint.com/python/python_files_io.htm & Time Python - Functions Python - Modules Python - Files I/O Python - http://sthurlow.com/python/lesson10/ Exceptions Python Advanced Tutorial Python - Classes/Objects Python - Reg Expressions Python - CGI Programming Python - Database Access Python - Networking Python - Sending Email Python - Multithreading Python - XML Processing Python - GUI Programming Python - Further Extensions Python Useful Resources Python - Questions and Answers Python - Quick Guide Python - Tools/Utilities Python python exception - Useful Resources Python - Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who Python Files I/O Advertisements Previous Page Next Page This chapter covers all the basic I/O functions available in Python. For more functions, please refer to standard Python documentation. Printing to the Screen The simplest way to produce output is using the print statement where file i/o error you can pass zero or more expressions separated by commas. This function converts the expressions you pass into a string and writes the result to standard output as follows − #!/usr/bin/python print "Python is really a great language,", "isn't it?" This produces the following result on your standard screen − Python is really a great language, isn't it? Reading Keyboard Input Python provides two built-in functions to read a line of text from standard input, which by default comes from the keyboard. These functions are − raw_input input The raw_input Function The raw_input([prompt]) function reads one line from standard input and returns it as a string (removing the trailing newline). #!/usr/bin/python str = raw_input("Enter your input: "); print "Received input is : ", str This prompts you to enter any string and it would display same string on the screen. When I typed "Hello Python!", its output is like this − Enter your input: Hello Python Received input is : Hello Python The input Function The input([prompt]) function is equivalent to raw_input, except that it assumes the input is a valid Python expression and returns the evaluated result to you. #!/usr/bin/python str = input("Enter your input: "); print "Received input is : ", str This would produce the following

Importing Modules File I/O Error Handling File I/O Introduction Last lesson we learnt how to load external code into our program. Without any introduction (like what I usually have), let's delve into file input and output with normal text files, and later the saving and restoring of instances of classes. (Wow, our lingo power has improved greatly!) Opening a file To open a text file you use, well, the open() function. Seems sensible. You pass certain parameters to open() to tell it in which way the file should be opened - 'r' for read only, 'w' for writing only (if there is an old file, it will be written over), 'a' for appending (adding things on to the end of the file) and 'r+' for both reading and writing. But less talk, lets open a file for reading (you can do this in your python idle mode). Open a normal text file. We will then print out what we read inside the file: Code Example 1 - Opening a file openfile = open('pathtofile', 'r') openfile.read() That was interesting. You'll notice a lot of '\n' symbols. These represent newlines (where you pressed enter to start a new line). The text is completely unformatted, but if you were to pass the output of openfile.read() to print (by typing print openfile.read()) it would be nicely formatted. Seek and You Shall Find Did you try typing in print openfile.read()? Did it fail? It likely did, and reason is because the 'cursor' has changed it's place. Cursor? What cursor? Well, a cursor that you really cannot see, but still a cursor. This invisible cursor tells the read function (and many other I/O functions) where to start from. To set where the cursor is, you use the seek() function. It is used in the form seek(offset, whence). whence is optional, and determines where to seek from. If whence is 0, the bytes/letters are counted from

 

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