Here is my current code
a_reader = None
a_reader = open('data.csv', 'rU')
a_csv_reader = csv.reader(a_reader)
for row in a_csv_reader:
print row
a_reader.close()
count = 0
sum = 0.0
a_reader = open('data.csv', 'rU')
a_csv_reader = csv.reader(a_reader)
a_csv_reader.next()
for row in a_csv_reader:
if count != 0 and row[0] != '':
sum = sum + float(row[0])
count = count + 1
a_reader.close()
print 'Number of lines is:',count
print 'Sum is:',sum
return listStation
This produces the results below
['1', '476050', '7709929']
['2', '473971', '7707713']
['3', '465676', '7691097']
['4', '515612', '7702192']
['5', '516655', '7704405']
['6', '519788', '7713255']
['7', '538466', '7683341']
Number of lines is: 8
Sum is: 28.0
Ok so the output that I want is shown below in a double list.
[[476050, 7709929],[473971, 7707713],[465676, 7691097],[515612, 7702192],[516655, 7704405],[519788, 7713255],[538466, 7683341]]
How can I alter my code to produce the result as a double list as shown above. Is it possible to create a doublelist of coordinate pairs as shown above. Can you help me?
Any help is appreciated.
3 Answers
Slice off the last two elements, then append.
>>> ['1', '476050', '7709929'][1:3]
['476050', '7709929']
import csv
import itertools
with open('data.csv') as f:
reader = csv.reader(f)
rows = []
total = 0
for row in itertools.islice(reader, 1, None): # Skip a header
if row[0]:
total += int(row[0])
rows.append(row[1:])
print 'Number of lines is:', len(rows)
print 'total is', total
print rows
Instead of:
for row in a_csv_reader:
print row
Use a list comprehension to slice the list:
for i in [row[-2:] for row in a_csv_reader]:
print i
Which prints:
['476050', '7709929']
['473971', '7707713']
['465676', '7691097']
['515612', '7702192']
['516655', '7704405']
['519788', '7713255']
['538466', '7683341']
So thus [row[-2:] for row in a_csv_reader] is:
[['476050', '7709929'], ['473971', '7707713'], ['465676', '7691097'], ['515612', '7702192'], ['516655', '7704405'], ['519788', '7713255'], ['538466', '7683341']]
Which is your expected output.
