Python-сообщество

 from decimal import Decimal
q = Decimal('0.00')
a = 1.00
b = 0.75
c = 0.00
x = [a,b,c]
print (Decimal(min(x)).quantize(q))

 d = {'OVC':1.00,'BKN': 0.75,'SCT':0.40,'FEW':0.15,'SKC':0.00,'CLR':0}
for bl in block:
    ikao = bl.find('station_id').text
    clouds = bl.findall('sky_condition')
    out = []
    for i in clouds:
        key = i.get('sky_cover')
        out.append(d[key])
    if out: print ikao,out,max(out)
    else: print ikao

ODIN 11 12 13
DVA 21 22 23
TRI 31 32 33
NULL 01 02 03

DVA 444 555
CHE 344 324
TRI  777 888
SEM 987 435
ODIN 999 000

 #
odin_txt = {'ODIN': [11, 12, 13], ...}
dva_txt = {...}

 import pandas as pd
data1 = pd.read_table('one.txt', header=None, sep='\s+',
                      na_values='NA', keep_default_na=False)
data2 = pd.read_table('two.txt', header=None, sep='\s+',
                      na_values='NA', keep_default_na=False)
result = []
for ind, item in data1.iterrows():
    res = data2.ix[data2[0]==item[0], :]
    if not res.empty:
        ss = pd.concat([data1.iloc[ind, :], res.iloc[0,1:]])
    else:
        ss = data1.iloc[ind,:]
    result.append(ss.tolist())
print(result) # save results to a new file

 def fn(d,l,flag=True):
    for i in l:
        tmp = i.strip().split(' ')
        key = tmp[0]
        if not key in d:
            if not flag: continue
            else: d[key] = []
        for i in tmp[1:]: d[key].append(i)
    return d
    
f1 = open('1.txt').readlines()
f2 = open('2.txt').readlines()
d = fn({},f1,True)
d = fn(d,f2,False)
for i in d:print i,d[i]

 #!/usr/bin/env python
# coding:utf8
from lxml import etree
import urllib
url = 'https://aviationweather.gov/adds/dataserver_current/current/metars.cache.xml'
urllib.urlretrieve(url, filename='metar.xml')
tree = etree.parse('metar.xml') # Парсинг файла
block = tree.xpath('/response/data/METAR')
qwerty = ['ULLI', 'UBBL', 'LRCT']	
for a in qwerty:
    
    for b in block:
        ikao = b.find('station_id').text
        if ikao != a:
            continue
        clouds = b.findall('sky_condition')
        time = b.find('observation_time').text
        tim = time.split(r'T')
        ti = tim[1].split(r':')
        t = ti[0]+':'+ti[1]
        out = []
        for i in clouds:
            out.append(i.get('sky_cover'))
        print ikao,str(t) ,' '.join(out)
        break

 #!/usr/bin/env python
# coding:utf8
from lxml import etree
import urllib
import time
tp1 = time.time()
url = 'https://aviationweather.gov/adds/dataserver_current/current/metars.cache.xml'
urllib.urlretrieve(url, filename='metar.xml')
tp2 = time.time()
tree = etree.parse('metar.xml') # Парсинг файла
block = tree.xpath('/response/data/METAR')
qwerty = ['ULLI', 'UBBL', 'LRCT']	
for b in block:    
        ikao = b.find('station_id').text
        if not ikao in qwerty: continue
        clouds = b.findall('sky_condition')
        time0 = b.find('observation_time').text
        tim = time0.split(r'T')
        ti = tim[1].split(r':')
        t = ti[0]+':'+ti[1]
        out = []
        for i in clouds:
            out.append(i.get('sky_cover'))
        print ikao,str(t) ,' '.join(out)
tp3 = time.time()
print 'execution time',tp2 - tp1,tp3 - tp2

 ULLI 05:00 OVC
UBBL 05:00 OVC
LRCT 05:00 BKN
execution time 19.0136210918 0.384562015533