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Name: [002] Ian Ozsvald
Member: 108 months
Authored: 181 videos
Description: I am the co-founder of ShowMeDo (see http://showmedo.com/about), author of `The Screencasting Handbook <http://thescreencastinghandbook.com>`_ and the founder of the professional screencast production company `ProCasts <http://procasts.co.uk>`_: .. image:: http://procasts.co.uk/media/procasts_sma ...

Reading and Writing Text Files [ID:1351] (3/5)

in series: Python Beginners - File I/O

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Next we build upon the previous episode, this time we use raw_input to ask the user a question after every line is shown. Having gathered the answers we write out a new text file which combines both the originally read data and the user's input.

"""textfiles2.py read text from a file"""
# http://docs.python.org/library/functions.html#raw_input

# open a file for reading in the current directory
f = open('textdata_in.txt', 'r')
# read all the lines into a list
lines = f.readlines()

ages = [] # empty list for pairs of names and ages
for line in lines:
    name = line.strip()
    # note int() conversion of string->int
    # also note that there's no error handling here for bad input!
    age = int(raw_input("What is %s's age? " % (name)))
    ages.append((name, age))
    
# print the name+age pairs    
print ages

# open a 2nd file for writiing
fo = open('textdata_out.txt', 'w')
# iterate over each line, print name then age then carriage-return
for name, age in ages:
    fo.write('%s, %d\n' % (name, age))
# tidy up by closing the file to flush all writes, not strictly necessary
# as files are closed when the script finishes anyway
fo.close()

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All comments excluding tick-boxed quick-comments

very interesting,

wonder if we can open up a file on the server to write on

what would be the procedure


Very informative in a short piece of time. Got to the point and explained well. Providing the source also earns a big plus. I feel ready to write my own little python script now... though, I was noticing, none of your scripts(so far in this series) include any Sunit tests which you mention as important at the very beginning of the python series.


What about testing for non int values? How would you provide for that test in the code?


Very informative in a short piece of time. Got to the point and explained well. Providing the source also earns a big plus. I feel ready to write my own little python script now... though, I was noticing, none of your scripts(so far in this series) include any Sunit tests which you mention as important at the very beginning of the python series.


great video and very well explained. Thanks!


great episode! ...keyboard input comes in really handy. :)


Nice work, Ian! Thanks for the bit about using 'wa' for appending to an existing file.


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