tylko linie łączenia ze spacjami w Pythonie

Question

mam poniższe dane .. Gdzie można zobaczyć przestrzenie między 2 linii na początku i bez spacji pomiędzy nimi niektórych innych liniach:

Report Area 

Total Population 

Total Land Area 
(Square Miles) 

Population Density 
(Per Square Mile) 


Report Area 37,325,068 155,738.02 239.67 
Alameda County, CA 1,515,136 738.82 2,050.75 
Alpine County, CA 1,197 738.13 1.62 
Amador County, CA 37,764 594.43 63.53 
Butte County, CA 220,101 1,636.03 134.53 
Calaveras County, CA 45,507 1,019.74 44.63 
Colusa County, CA 21,329 1,150.43 18.54 

muszę ostateczną wyjście jako to:

Report Area Total Population Total Land Area(Square Miles) Population Density(Per Square Mile) 

Report Area 37,325,068 155,738.02 239.67 
Alameda County, CA 1,515,136 738.82 2,050.75 
Alpine County, CA 1,197 738.13 1.62 
Amador County, CA 37,764 594.43 63.53 
Butte County, CA 220,101 1,636.03 134.53 
Calaveras County, CA 45,507 1,019.74 44.63 
Colusa County, CA 21,329 1,150.43 18.54 

próbowałem, używając output = " ".join(line.strip() for line in f) ale nie robi praca jak trzeba.

to moje wyjście:

Report Area Total Population Total Land Area (Square Miles) Population Density (Per Square Mile) Report Area 37,325,068 155,738.02 239.67 Alameda County, CA 1,515,136 738.82 2,050.75 Alpine County, CA 1,197 738.13 1.62 Amador County, CA 37,764 594.43 63.53 

wszystkie linie w jednej linii ..

Answer 1

import re 
p = re.compile(ur'\n\n|\n(?=[^\n]*\n\n)', re.IGNORECASE) 
test_str = u"Report Area\n\nTotal Population\n\nTotal Land Area\n(Square Miles)\n\nPopulation Density \n(Per Square Mile)\n\n\nReport Area 37,325,068 155,738.02 239.67 \nAlameda County, CA 1,515,136 738.82 2,050.75 \nAlpine County, CA 1,197 738.13 1.62 \nAmador County, CA 37,764 594.43 63.53 \nButte County, CA 220,101 1,636.03 134.53 \nCalaveras County, CA 45,507 1,019.74 44.63 \nColusa County, CA 21,329 1,150.43 18.54 " 
subst = u" " 

result = re.sub(p, subst, test_str) 

Można spróbować poprzez re.

Answer 2

Korzystanie warunkową listowych:

output = os.linesep.join(line for line in f if " " in line)