On 5/14/2012 10:16 PM, questions anon wrote:
I am completely new to dictionaries and I am not even sure if this is
what I need to use.
I have a text file that I would like to run summary stats on
particular months, years and climate indices (in this case the climate
indices are rainfall and fire area, so not actualy climate indices at
all).
I would set up a SQLite database with a table of 4 numeric columns:
year, month, rainfall, firearea
Use SQL to select the desired date range and do the max and avg
calculations:
select year, avg(firearea), max(rainfall) from table where year = 1973
and month between 6 and 8)
you can use dictionaries but that will be harder. Here a start
(untested). Assumes data are correct.
months =
dict(Jan=1,Feb=2,Mar=4,Apr=4,May=5,Jun=6,Jul=7,Aug=8,Sep=9.Oct=10,Nov=11,Dec=12)
for line in open('d:/yearmonthrainfire.txt','r'):
line = line.split()
year = int(line[0])
month = months[line[1]]
rainfall = float(line[2]
firearea = float(line[3]
sql = "insert into table (year, month, rainfall, firearea)
values(%i,%i,%f,%f)" % (year, month, rainfall, firearea)
# I don't have handy how one runs the sql
A text file is attached but a small sample of the file:
rainfall firearea
1972 Jan 12.7083199 0
1972 Feb 14.17007142 0
1972 Mar 14.5659302 0
1972 Apr 1.508517302 0
1972 May 2.780009889 0
1972 Jun 1.609619287 0
1972 Jul 0.138150181 28
1972 Aug 0.214346148 32
1972 Sep 1.322102228 34747.8
1972 Oct 0.092663137 3655.9
1972 Nov 1.852276635 85.1
1972 Dec 2.011206002 42959.6
1973 Jan 5.55704346 153.5
1973 Feb 12.60326356 116.2
1973 Mar 11.08849105 223.6
1973 Apr 5.864925449 2.4
......
I have used an example from a book (a primer on scientific programming
with python) and it seems to be working (see below) but I am not sure
if I have my keys etc. are set up correctly to then begin anlaysis,
and even how to use the dictionaries in my analysis
. For example how can I print out the year with calculated the mean
'firearea' of June-July-August for that year along with the maximum
'rainfall' for June-July-august of the same year?
Any feedback will be greatly appreaciated!
infile=open('d:/yearmonthrainfire.txt','r')
lines=infile.readlines()
infile.close()
data={} #data[index][year]=indexvalue
first_line=lines[0]
climateindexname=first_line.split()
for index in climateindexname:
data[index]={}
YEAR={}
MONTH={}
for line in lines[2:]:
words=line.split()
year=words[0] #years
YEAR[year]={}
month=words[1] #months
MONTH[month]={}
values=words[2:] #values of climateindices
for index, v in zip(climateindexname, values):
if v !=' ':
data[index][year]=float(v)
print "years=", YEAR
print "months=", MONTH
print "data=", data
We usually reserve all caps names for constants.
You have way too many dictionaries.
Your program seems very complex for a very simple task.
I will not attempt to figure out what it does.
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Bob Gailer
919-636-4239
Chapel Hill NC
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