Question

我正在尝试读取两个文件，并在读取并进行一些更新后将它们打印在另外两个单独的文件中。我的输入文件名为big-1.csv和big-2.csv。因此，我试图使用for循环读取这两个文件。对于输出即时消息，我尝试使用名称fix-1.csv和fix-2.csv打印它们，但是看来我的for循环第二次没有运行，只运行了一次，而只读写第一个big-1。 csv文件修复为1.csv文件。

我的代码是：

import csv
from csv import DictWriter

for i in range(1,2):    
        print(i) #just a flag to check
        with open("big-" + str(i) + ".csv") as people_file:
            next(people_file)
            corrected_people = []
            for person_line in people_file:
                chomped_person_line = person_line.rstrip()
                person_tokens = chomped_person_line.split(",")

                # check that each field has the expected type
                try:
                    corrected_person = {
                    "id": person_tokens[0],
                    "first_name":person_tokens[1],
                    "last_name": "".join(person_tokens[2:-3]),
                    "email":person_tokens[-3],
                    "gender":person_tokens[-2],
                    "ip_address":person_tokens[-1]  

                    }

                    if not corrected_person["ip_address"].startswith(
                            "") and corrected_person["ip_address"] !="n/a":
                        raise ValueError

                    corrected_people.append(corrected_person)
                except (IndexError, ValueError):
                    # print the ignored lines, so manual correction can be performed later.
                    print("Could not parse line: " + chomped_person_line)

        with open("fix-" + str(i) + ".csv", "w") as corrected_people_file:
            writer = DictWriter(
            corrected_people_file,
            fieldnames=[
                        "id","first_name","last_name","email","gender","ip_address"
                ],delimiter=',')
            writer.writeheader()
            writer.writerows(corrected_people)

输出即时消息是：

j:\Programs\Python>python "for loop testing.py"
1

j:\Programs\Python>

和fix-1.csv文件。更新部分工作正常。我面临的唯一问题是for循环仅运行一次。请注意，没有缩进错误。请帮忙。

Answer 1

range(1,2)仅包含一个值（数字1）。

也许你是说

for i in (1,2): # values are 1 and 2

或

for i in range(2): # values are 0 and 1

或

for i in range(1,3): # values are 1 and 2

Python无法在for循环中的第二个文件中读取\写入

1 个答案: