使用Python编辑CSV文件时跳过标题
我正在使用以下引用的代码使用Python编辑CSV。代码中调用的函数构成了代码的上部。
问题:我希望下面引用的代码从第二行开始编辑csv,我希望它排除包含标题的第一行。现在,它仅在第一行上应用函数,并且我的标题行正在更改。
in_file = open("tmob_notcleaned.csv", "rb")reader = csv.reader(in_file)
out_file = open("tmob_cleaned.csv", "wb")
writer = csv.writer(out_file)
row = 1
for row in reader:
row[13] = handle_color(row[10])[1].replace(" - ","").strip()
row[10] = handle_color(row[10])[0].replace("-","").replace("(","").replace(")","").strip()
row[14] = handle_gb(row[10])[1].replace("-","").replace(" ","").replace("GB","").strip()
row[10] = handle_gb(row[10])[0].strip()
row[9] = handle_oem(row[10])[1].replace("Blackberry","RIM").replace("TMobile","T-Mobile").strip()
row[15] = handle_addon(row[10])[1].strip()
row[10] = handle_addon(row[10])[0].replace(" by","").replace("FREE","").strip()
writer.writerow(row)
in_file.close()
out_file.close()
我试图通过将row
变量初始化为来解决此问题,1但没有成功。
请帮助我解决这个问题。
回答:
你的reader
变量是可迭代的,通过循环它可以检索行。
要使其在循环前跳过一项,只需调用next(reader, None)
并忽略返回值即可。
你还可以稍微简化代码;使用打开的文件作为上下文管理器可以自动关闭它们:
with open("tmob_notcleaned.csv", "rb") as infile, open("tmob_cleaned.csv", "wb") as outfile: reader = csv.reader(infile)
next(reader, None) # skip the headers
writer = csv.writer(outfile)
for row in reader:
# process each row
writer.writerow(row)
# no need to close, the files are closed automatically when you get to this point.
如果你想将标头写入未处理的输出文件中,也很容易,请将输出传递next()
给writer.writerow()
:
headers = next(reader, None) # returns the headers or `None` if the input is emptyif headers:
writer.writerow(headers)
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