我正在使用 pythons csv 阅读器。如何使用以下代码来忽略空行。
import csv
f1 = open ("ted.csv")
oldFile1 = csv.reader(f1, delimiter=',', quotechar='"')
oldList1 = list(oldFile1)
f2 = open ("ted2.csv")
newFile2 = csv.reader(f2, delimiter=',', quotechar='"')
newList2 = list(newFile2)
f1.close()
f2.close()
with open("ted.csv") as f1, open("ted2.csv") as f2, open('foo.csv', 'w') as out:
r1, r2 = csv.reader(f1), csv.reader(f2)
st = set((row[0], row[3]) for row in r1)
wr = csv.writer(out)
for row in (row for row in r2 if (row[0],row[3]) not in st):
wr.writerow(row)
最佳答案
如果您的空白始终位于第一行,那么 Marius 的答案是最简单的。如果开头有 n 个空格或者您只是想跳过一些行,则可以使用 itertools.islice()
.
跳过前 N 行
假设您想跳过前 4
行(无论是否为空行):
from itertools import islice
with open('csv2.csv', 'r') as f1, open('out.csv', 'w') as out:
filt_f1 = islice(f1, 4, None)
r1 = csv.reader(filt_f1)
wr = csv.writer(out)
for line in r1:
...
全文空白行
如果您的文件中散布着空白行,那么您可以使用 itertools.filterfalse
将其过滤掉。 .
import csv
from itertools import filterfalse
from itertools import chain
with open('csv1.csv', 'r') as f1, open('csv2.csv', 'r') as f2, open('out.csv', 'w') as out:
# create an iterator without lines that start with '\n'
filt_f1 = filterfalse(lambda line: line.startswith('\n'), f1)
filt_f2 = filterfalse(lambda line: line.startswith('\n'), f2)
# csv.reader consumes the filtered iterators
r1, r2 = csv.reader(filt_f1), csv.reader(filt_f2)
wr = csv.writer(out)
# here insert your logic, I just write both to the same file
for line in chain(r1, r2):
wr.writerow(line)
csv1.csv 的位置:
time,name,location
12345,Jean,Montreal
12346,Peter,Chicago
1234589,Doug,Boston
和 csv2.csv(注意:此处未显示,但 csv2.csv 在文件顶部有 4 个空行):
123457,Scott,San Diego
123458,Jen,Miami
123459,Robert,Sacramento
输出 out.csv 整个过程中没有空行:
time,name,location
12345,Jean,Montreal
12346,Peter,Chicago
1234589,Doug,Boston
123457,Scott,San Diego
123458,Jen,Miami
123459,Robert,Sacramento
关于python csv阅读器忽略空白行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31508832/