How to iterate a loop based on a user's input?

Question

I'm new here, but look here often for help. Anyways, I am trying to use tkSimpleDialog.askinteger() to ask for how many files the user needs to read into the program. I want to read the files in based on the integer that the user inputs in a for loop. I would index the file names f[1] through f[n] for the file names. Any input would be greatly appreciated!

Please view below for an idea of what I am trying to get at:

def callback2():
    NumDates = tkSimpleDialog.askinteger("NDates", "How many dates are there?")
    for dates in NumDates:
        filename[dates] = tkFileDialog.askopenfilename() 
        dates = dates + 1
        filenameDates.append(filename)

mgilson · Accepted Answer · 2012-08-23 18:53:20Z

7

Assuming NumDates is an integer, you're looking for the range function:

for dates in range(NumDates):
    ...

In python 2.x, you can use xrange instead. This doesn't create an intermediate list so many people prefer it. In python 3, xrange was renamed range and the former range function which returns a list was removed -- When the lists are small, I usually just use range for compatibility, but there exist tools (2to3) to take care of these details for you as well, so it really isn't a big deal either way.

aside

Also, as written, there really is no need for the dates = dates + 1 (which is better written as dates += 1 when necessary).

edited Aug 23, 2012 at 18:53

answered Aug 23, 2012 at 18:48

mgilson

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1 Comment

martineau Over a year ago

@user1620716: dates should probably be just date since represents just a one in the in NumDates range, which according to PEP 8 -- [Style Guide for Python Code really ought to be written num_dates otherwise it looks like the name of a class.

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