[英]Python csv: preserve headers when writing to file
我編寫了一個簡單的函數,根據用戶提供的CSV行數,通過添加或刪除列來執行操作:
def sanExt(ifpath, ofpath):
with open(ifpath, "rb") as fin, open(ofpath, "wb") as fout:
csvin = csv.reader(fin)
csvout = csv.writer(fout, delimiter=",")
fline = csvin.next()
if len(fline) == 33:
for row in csvin:
row.insert(10, "NULL")
csvout.writerow(row)
print "AG"
elif len(fline) == 35:
print "AI"
elif len(fline) == 36:
print "AJ"
else:
print "Unknown"
我已經停在第一個if
語句,只是為了確保我的代碼有效。 在這種情況下,該列已正確添加,但標題丟失。
如何確保每行都寫入文件,而不僅僅是[1:len(rows)]
?
我的方法是正確的pythonic方式來完成所需的工作嗎?
如果您不需要通過列名訪問csv.DictReader
,那么傳統的解決方案基於以下內容:
with open('in.csv') as fin, open('out.csv', 'wb') as fout:
csvin = csv.reader(fin)
csvout = csv.writer(fout)
try:
header = next(csvin)
csvout.writerow(header)
except StopIeration as e:
pass # empty file - either handle, or we'll just continue and drop out of loop
for row in csvin:
csvout.writerow(row) # do some real work here...
使用csv.DictReader,csv.DictWriter及其writeheader()方法來處理帶有少量多余代碼的標題行。
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