Thank you Kent, Chris, Danny,
This is superb, let me work on my part for now and I promise get back to the group with more ...
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Andrzej Kolinski wrote:
>
> I want to create a program that uses data from text files, makes
> appropriate calculations and produces report. First I need to find out
> what is the right way to retrieve appropriate information from an input
> file. This is a typical format of the input file:
>
> 1 Polonijna Liga Mistrzow |from the heading portion
> 26 wrzesnia 2005 |only
> 6 12 *6* *4* 1 |'6' and '4' will be needed
> 0 1 0
> *Bohossian* - *Kolinski* |all names and
> 1 |all scores
> 1.000 9 *13* 19 |(3rd column -
> 2.000 2 *4* 16 |'13', '4', '8', '6'
> 1.000 10 *8* 17 |will be needed
> 0.000 8 *6* 17 |
> *Szadkowska* - *Szczurek *|
> 2 |same here
> 0.000 11 *16* 20 |
> 3.000 1 *-4* 14 |
> 3.500 3 *-7* 13
> 2.500 10 *13* 19
> ..................
>
> 1 1 |skip the rest
> 1 1 1 |(at least for now)
It's pretty simple to make an ad-hoc reader for this data. A couple of things you need:
- You can get individual lines from a file by treating it as an iterator. Instead of the usual
f = open('data.txt')
for line in f:
you can call f.next() to get a single line. This makes it easy to skip lines or process lines differently.
The call to f.next() will raise StopIteration when there are no more lines
- You can use split() to break a line into fields, then subscripting to pull out the data you want:
>>> line = ' 1.000 9 13 19'
>>> line.split()
['1.000', '9', '13', '19']
>>> line.split()[2]
'13'
>>> int(line.split()[2])
13
With these tools the solution is pretty simple. I pull the data from a string but it will work with a file as well. I save the results in a dictionary which maps name to a list of scores.
data = '''1 Polonijna Liga Mistrzow
26 wrzesnia 2005
6 12 6 4 1
0 1 0
Bohossian - Kolinski
1
1.000 9 13 19
2.000 2 4 16
1.000 10 8 17
0.000 8 6 17
Szadkowska - Szczurek
2
0.000 11 16 20
3.000 1 -4 14
3.500 3 -7 13
2.500 10 13 19
'''.split('\n')
#lines = open('data.txt') # to get the data from a real file
lines = iter(data) # getting data from a string, you don't need this when reading a file
lines.next() # skip two headers
lines.next()
header = lines.next().split()
six = int(header[2])
four = int(header[3])
print six, four
lines.next()
allScores = {} # accumulate scores into a dictionary whose key is the name
# Now we can process the names and scores in a loop
try: # you don't say how you know the end of the names, I just run to the end of data
while True:
name = lines.next().strip()
lines.next() # skip line after name
scores = [ int(lines.next().split()[2]) for i in range(4) ]
allScores[name] = scores
except StopIteration: # no more lines
pass
for name, scores in allScores.items():
print name, scores
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