从CSV中删除空白行？ [英] Delete blank rows from CSV?

问题描述

我有一个大的csv文件，其中一些行是完全空白的。如何使用Python从csv中删除所有空白行？

I have a large csv file in which some rows are entirely blank. How do I use Python to delete all blank rows from the csv?

在所有的建议之后，这是我到目前为止

After all your suggestions, this is what I have so far

import csv

# open input csv for reading
inputCSV = open(r'C:\input.csv', 'rb')

# create output csv for writing
outputCSV = open(r'C:\OUTPUT.csv', 'wb')

# prepare output csv for appending
appendCSV = open(r'C:\OUTPUT.csv', 'ab')

# create reader object
cr = csv.reader(inputCSV, dialect = 'excel')

# create writer object
cw = csv.writer(outputCSV, dialect = 'excel')

# create writer object for append
ca = csv.writer(appendCSV, dialect = 'excel')

# add pre-defined fields
cw.writerow(['FIELD1_','FIELD2_','FIELD3_','FIELD4_'])

# delete existing field names in input CSV
# ???????????????????????????

# loop through input csv, check for blanks, and write all changes to append csv
for row in cr:
    if row or any(row) or any(field.strip() for field in row):
        ca.writerow(row)

# close files
inputCSV.close()
outputCSV.close()
appendCSV.close()

这是确定还是有更好的方法？ / p>

Is this ok or is there a better way to do this?

推荐答案

使用 csv 模块：

import csv
...

input = open(in_fnam, 'rb')
output = open(out_fnam, 'wb')
writer = csv.writer(output)
for row in csv.reader(input):
    if row:
        writer.writerow(row)
input.close()
output.close()

需要删除所有字段都为空的行，将如果行：行更改为：

If you also need to remove rows where all of the fields are empty, change the if row: line to:

if any(row):

只有空格为空，你可以替换为：

And if you also want to treat fields that consist of only whitespace as empty you can replace it with:

if any(field.strip() for field in row):

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