[英]How to delete only one row of a csv and save the changes in the same csv? [Python]
[英]How to delete only one row in CSV with python
我正在嘗試制作一個程序來在CSV文件中存儲名稱列表,並且試圖添加一個刪除行的功能,該功能無法正常工作,因為它刪除了CSV文件中的所有內容。
我試過使用writer.writerow(row),但沒有用。
memberName = input("Please enter a member's name to be deleted.")
imp = open('mycsv.csv' , 'rb')
out = open('mycsv.csv' , 'wb')
writer = csv.writer(out)
for row in csv.reader(imp):
if row == memberName:
writer.writerow(row)
imp.close()
out.close()
我希望程序僅刪除包含memberName的行,但是它將刪除CSV文件中的每一行。 如何將其更改為僅刪除一行?
您不能在讀取文件時寫入同一文件。 而是使用另一個文件進行輸出,例如:
import csv
member_name = input("Please enter a member's name to be deleted: ")
with open('in_file.csv') as in_file, open('out_file.csv', 'w') as out_file:
reader = csv.reader(in_file)
writer = csv.writer(out_file)
for row in reader:
if member_name not in row: # exclude a specific row
writer.writerow(row)
或者,您可以將所需的行存儲在內存中,並在重置文件指針之后將它們寫回到輸入文件中:
import csv
member_name = input("Please enter a member's name to be deleted: ")
with open('in_file.csv', 'r+') as in_file:
reader = csv.reader(in_file)
rows = [row for row in csv.reader(in_file) if member_name not in row]
in_file.seek(0)
in_file.truncate()
writer = csv.writer(in_file)
writer.writerows(rows)
這對我有用:您可以將csv文件的內容寫到列表中,然后在python中編輯列表,然后將列表寫回到csv文件中。
lines = list()
memberName = input("Please enter a member's name to be deleted.")
with open('mycsv.csv', 'r') as readFile:
reader = csv.reader(readFile)
for row in reader:
lines.append(row)
for field in row:
if field == memberName:
lines.remove(row)
with open('mycsv.csv', 'w') as writeFile:
writer = csv.writer(writeFile)
writer.writerows(lines)
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