Python for-loop

Question

I have a txt file with data like this:

(NAME|RANGE|PASSANGERS)
Airbus A330-200|12000|263
Airbus A321-200|4600|200
Airbus A320-200|5500|162
Airbus A319-100|5700|132
Embraer 190|4445|106
ATR 72-600|1529|70

and i need to compare the number in the second column between every line and then print the NAME of the plane with the higher RANGE number (Need to print the NAME but have to compare and order it from highest RANGE to lowest RANGE). So far i have this:

f = open("./dados/aeronaves.txt","r")
d=[]
c=[]
tempList=[]
for line in f:
    a =(line.strip().split('|'))
    b = c.append(a)
    d.append(int(a[1]))
    d.sort()
for i in range(0,len(c)):
    print(c[i])
    print(c[i][1])
f.close()

but i dont know how to do it with the for in range but it has to be with it...

HELP

thx @melpomene im new to this...

Raizan
– Raizan

2017-01-03 06:43:24 +00:00
Commented Jan 3, 2017 at 6:43 — Raizan
– Raizan, Commented Jan 3, 2017 at 6:43

Einstein · Accepted Answer · 2017-01-03 06:43:55Z

4

Using sorted

all_planes = []
f = open("./dados/aeronaves.txt","r")
for line in f.readlines()[1:]: #skip title line
    plane = line.strip().split('|')
    all_planes.append(plane)
all_planes = sorted(all_planes, key=lambda x: x[1])
for p in all_planes:
    print(p[0])

answered Jan 3, 2017 at 6:43

Einstein

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14 Comments

melpomene Over a year ago

That's not in descending order, is it? I think you need reverse=True.

Einstein Over a year ago

yeah thats ascending order, just add a negative symbol before x[1] in the sorted statement. reverse=True works

Ouroborus Over a year ago

Or use reversed().

melpomene Over a year ago

@Ouroborus That's less efficient than just using the right sorting comparison.

Raizan Over a year ago

That works but it skips one line in the txt file @Einstein EDIT: i failed to notice the comment on the code nvm

|

Chandan Purohit · Accepted Answer · 2017-01-03 09:23:25Z

Although the above answers work, i would ve preferred namedtuples and attrgetter with heapq in the long run. Here is what i would ve done,

from operator import attrgetter
from collections import namedtuple
Plane = namedtuple("Plane","name range passengers")

with open('./dados/aeronaves.txt','r') as f:
    f.readline() #needed to read the first row
    planes = [Plane(*line.strip().split('|')) for line in f]

planes.sort(key=attrgetter('range'),reverse=True) #use heapq for more control
# print them all
print(planes) #or loop through and print

#use heapq for more control
import heapq
print(heapq.nsmallest(len(planes),planes,key=attrgetter('range')))

Joshi Sravan Kumar · Accepted Answer · 2017-01-04 05:20:45Z

0

You can sort the elements using the following one liner statement.

sorted_list = sorted([(line.strip().split('|')) for line in f], key=lambda k: int(k[1]))

edited Jan 4, 2017 at 5:20

answered Jan 3, 2017 at 6:43

Joshi Sravan Kumar

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