Christopher Spears wrote:
> I created a file called table.txt. Here is the file's
> contents:
>
> 1 5 10 2 1.0
> 2 10 20 4 2.0 3
> 3 15 30 8 3 2 1
> 4 20 40 16 4.0
>
> I modified a script I found in "Programming Python"
> and created script called summer_v03.py that added the
> columns together succesfully and outputted the results
> in a list:
>
> [EMAIL PROTECTED] ./text_proc 158> ./summer_v03.py
> table.txt
> [10.0, 50.0, 100.0, 30.0, 10.0, 5.0, 1.0]
>
> Here is the code:
It is very wordy. There is no need to read and split the file twice. I
would just make a list of the (split) lines in the file and keep it
around. The loops in find_longest_line can easily be replaced with list
comprehensions.
Some of your names are a little off. lines_in_file is actually a single
line; cols_in_file is the cols of a single line.
Reading the file into a list of split columns and finding the length of
the longest line is as simple as
data = [ line.split() for line in open(fileName) ]
numCols = max(len(cols) for cols in data)
Then your summing loop pretty much stands, though you might want to use
enumerate() instead of range(len(cols)):
sums = [0] * numCols
for cols in data:
for i, col in enumerate(cols):
sums[i] += col
Kent
>
> #!/usr/bin/python
> import string
>
> def find_longest_line(fileName):
> longest_col = []
> for lines_in_file in open(fileName, 'r').readlines():
> cols_in_file = string.split(lines_in_file)
> #print cols_in_file
> numCols = len(cols_in_file)
> if numCols > len(longest_col):
> longest_col = cols_in_file
> return len(longest_col)
>
>
> def summer(fileName):
> length_longest_col = find_longest_line(fileName)
> sums = [0] * length_longest_col
> for lines_in_file in open(fileName, 'r').readlines():
> cols = string.split(lines_in_file)
> for i in range(len(cols)):
> sums[i] = sums[i] + float(cols[i])
> return sums
>
> if __name__ == '__main__':
> import sys
> print summer(sys.argv[1])
>
> What do you think?
>
>
> "I'm the last person to pretend that I'm a radio. I'd rather go out and be a
> color television set."
> -David Bowie
>
> "Who dares wins"
> -British military motto
>
> "I generally know what I'm doing."
> -Buster Keaton
> _______________________________________________
> Tutor maillist - Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor
>
>
_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
