Question

def write_to_csv():
    newRow = ['P12467','Cat','Ancora','Yes','Yes','D123456','Lost','14/09/2019','30/09/2019','return to owner',"290 Oak Avenue, BS79 8TR"]

    //with open('DADSA 2019-20 CWK A DATA PETS.csv', 'wb') as csv_file:
    with open("DADSA 2019-20 CWK A DATA PETS.csv", mode="a", newline='') as csv_file:
        # reader = csv.reader(csv_file)
        writer = csv.writer(csv_file)
        for row in csv.reader(csv_file):
            if row[0] == newRow[0]:
                writer.writerow(newRow)

我在csv.reader（csv_file）中的行中收到此错误： io.UnsupportedOperation：不可读”我真的不明白它的意思。

Answer 1

您有错字，应该使用newRow而不是csvFile，下面是固定代码：

def write_to_csv():
    newRow = ['P12467','Cat','Ancora','Yes','Yes','D123456','Lost','14/09/2019','30/09/2019','return to owner',"290 Oak Avenue, BS79 8TR"]

    #with open('DADSA 2019-20 CWK A DATA PETS.csv', 'wb') as csv_file:
    with open("DADSA 2019-20 CWK A DATA PETS.csv", mode="a", newline='') as csv_file:
        # reader = csv.reader(csv_file)
        writer = csv.writer(csv_file)
        for row in csv.reader(newRow):
            if row[0] == newRow[0]:
                writer.writerow(newRow)

Answer 2

您无法读取以a模式打开的文件。这是用于附加到文件。您可以使用a+模式，但需要先搜索到文件的开头。

但是，如果您只想添加新行，则无需先读取文件。只需打开文件并写入新行即可。

def write_to_csv():
    newRow = ['P12467','Cat','Ancora','Yes','Yes','D123456','Lost','14/09/2019','30/09/2019','return to owner',"290 Oak Avenue, BS79 8TR"]

    with open("DADSA 2019-20 CWK A DATA PETS.csv", mode="a", newline='') as csv_file:
        writer = csv.writer(csv_file)
        writer.writerow(newRow)

为什么我的硬编码数据没有写入文件？

2 个答案: