使用dictwriter覆盖相同csv文件中的行

我有names.csv

first_name,last_name
Baked,Beans
Lovely,Spam
John,Bang
Harry,Potter

我想在同一个文件中用“jason statham”重命名“John Ban”.
我试图使用file.seek()但失败了

import csv
with open('/home/tiwari/Desktop/names.csv','rw+') as csvfile:
    fieldnames = ['first_name','last_name']
    writer = csv.DictWriter(csvfile,fieldnames=fieldnames)
    reader = csv.DictReader(csvfile)
    for line,row in enumerate(reader):
        rs = sys.getsizeof(row)
        if row['first_name'] == 'John':
            csvfile.seek(-rs)
            writer.writerow({'first_name': 'Jason','last_name': 'statham'})

我建议读取所有行,并替换它们,并将其写回.

import csv

with open('/home/tiwari/Desktop/names.csv','r+') as csvfile:
    reader = csv.DictReader(csvfile)

    rows = []
    for row in reader:
        if row['first_name'] == 'John':
            row['first_name'] = 'Jason'
            row['last_name'] = 'Statham'
        rows.append(row)

    csvfile.seek(0)  # back to begining of the file.
    fieldnames = ['first_name',fieldnames=fieldnames)
    writer.writeheader()
    writer.writerows(rows)
    csvfile.truncate()  # In case of updated content is shorter.

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