如何从csv文件中删除换行符

Question

I have the below part of code that reads values from the csv file "prom output.csv" and writes them sorted in a new one "sorted output.csv".

import collections
import csv

with open("prom output.csv","r") as f:
    cr = csv.reader(f,delimiter=",")
    d=collections.defaultdict(lambda : list())
    header=next(cr)   
    for r in cr:
        d[r[0]].append(r[1])  
        

with open("sorted output.csv","w") as f:
    cr = csv.writer(f,delimiter=",")
    cr.writerow(header)  
    od = collections.OrderedDict(sorted(d.items()))
    for k,v in od.items():  s
        cr.writerow([k,",".join(v)]) 

However the output (see below) has spaces between each line and i would like to remove them. Can anybody help?

The input file "prom output.csv" has no spaces between each line as seen below

as a last midification i would like my output to look like:

any suggestions?

Answer 1

显然将行： cr = csv.writer(f,lineterminator='\\n') cr = csv.writer(f,sys.stdout, lineterminator='\\n')为： cr = csv.writer(f,sys.stdout, lineterminator='\\n')并将import sys添加到导入中解决了问题。

Answer 2

Changing

cr = csv.writer(f,delimiter=",")

to

cr = csv.writer(f,delimiter=",", lineterminator='\n')

does the trick.

I tried cr = csv.writer(f, lineterminator='\\n') and it still works.

Answer 3

This is a simple feasible solution:

import collections
import csv

with open('prom output.csv') as f:
    header = next(csv.reader(f))
    d = collections.OrderedDict()
    for r in csv.reader(f):
        try:
            d[r[0]] += ','+r[1]
        except:
            d[r[0]] = ','+r[1]

with open('sorted output.csv', 'w') as f:
    cw = csv.writer(f)
    cw.writerow(header)
    for k, v in d.items():
        f.write(k+v+'\n')

For the input of the following CSV file ( prom output.csv ):

case,event,startTime,completeTime
101,A
101,B
101,Y
102,C
102,D
102,U
103,A
103,B
103,Y

The output was ( sorted output.csv ):

case,event,startTime,completeTime
101,A,B,Y
102,C,D,U
103,A,B,Y

Which is the output as you intended it to be.

Answer 4

The Python newline character is, '\\n'. Therefore to remove the newline character (and hence the blank lines that are being printed) from your string, try:

cr.writerow([k, (",".join(v)), .strip("\n")])