我得到了一个 CSV 文件，其中包含行id、name和firstnamecompany

我正在循环 CSV 并csv.DictReader希望将一些默认值插入其中，name如果firstname它们为空

dict.get()应该可以解决问题 - 但它仅在name且不包含任何数据firstname 时才有效。一旦它们至少包含一次数据，返回的默认值将被忽略，并且不会返回任何内容

测试.csv

"id","name","firstname","company"
"1","doe","john","jdoe inc"
"2","doe","jane","jdoe inc"
"3",,,"company inc"

导入_csv.py

import csv

with open("test.csv") as csv_file:
    reader = csv.DictReader(csv_file)

    for row in reader:
        firstname = row.get("firstname", "Company")
        name = row.get("name", row["company"])
        company = row["company"]

        print(f"Firstname:  {firstname}")
        print(f"Name:       {name}")
        print(f"Company:    {company}\n")

上述测试脚本的输出是

Firstname:  john
Name:       doe
Company:    jdoe inc

Firstname:  jane
Name:       doe
Company: …