[英]header in csv file printing every other line
我一直在处理这个问题太久了,请向我解释为什么标题在我的输出 csv 中不断重复。
我有一个包含这些数据的输入 csv:
该问题需要颠倒姓氏和名字,将名称分成两列,并为输出 csv 创建一个包含 3 列的新标题。 这是我所拥有的:
while True:
try:
# open file
with open(sys.argv[1]) as file:
# make reader
reader = csv.reader(file)
# skip first line (header row)
next(reader)
# for each row
for row in reader:
# identify name
name = row[0]
# split at ,
name = name.split(", ")
# create var last and first, identify var house
last = name[0]
first = name[1]
house = row[1]
# writing the new csv
with open(sys.argv[2], "a") as after:
writer = csv.DictWriter(after, fieldnames=["first", "last", "house"])
# HEADER ONLY NEEDS TO OCCUR ONCE
writer.writeheader()
writer.writerow({"first": first, "last": last, "house": house})
sys.exit(0)
我的输出csv:
我试过删除while循环,取消缩进和缩进,用标题名称手动写一行(这会导致错误)。 请帮忙。 谢谢!
您可以添加一个变量来保存是否打印了标题,例如write_header
while True:
try:
write_header = True
# open file
with open(sys.argv[1]) as file:
# make reader
reader = csv.reader(file)
# skip first line (header row)
next(reader)
# for each row
for row in reader:
# identify name
name = row[0]
# split at ,
name = name.split(", ")
# create var last and first, identify var house
last = name[0]
first = name[1]
house = row[1]
# writing the new csv
with open(sys.argv[2], "a") as after:
writer = csv.DictWriter(after, fieldnames=["first", "last", "house"])
# HEADER ONLY NEEDS TO OCCUR ONCE
if write_header:
writer.writeheader()
write_header = False
writer.writerow({"first": first, "last": last, "house": house})
sys.exit(0)
看看我如何使用write_header
另一方面,您可以重构代码以在for
循环之前打开 csv 编写器,在此处写入标头,然后像现在一样写入值,而无需每次要写入一行时都重新打开文件
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