自动限制每个文件的行数并创建新文件 [英] automatically limit rows per file and create new files
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问题描述
我正在编写将大量数据写入 .csv 文件的脚本.我想自动限制每个文件的行数并创建新文件.
I am working on a script that will write a massive amount of data to a .csv file. I would like to automatically limit rows per file and create new files.
推荐答案
一个简单的方法是使用一个类来跟踪您的行并在需要时写入新文件(例如 self.max_row代码>)
A simple approach would be to use a class to keep track of your rows and write to a new file whenever needed (e.g. self.max_row
)
例如:
import csv
class MyCSV:
def __init__(self):
self.max_row = 10
self.cur_row = 0
self.file_number = 0
self.file_handle = None
def write_row(self, row):
if self.cur_row >= self.max_row or self.file_handle == None:
self.cur_row = 0
self.file_number += 1
if self.file_handle:
self.file_handle.close()
self.file_handle = open(f'output_{self.file_number:04}.csv', 'w', newline='')
self.csv_handle = csv.writer(self.file_handle)
self.csv_handle.writerow(row)
self.cur_row += 1
my_csv = MyCSV()
for row in range(1000): # create some simulated rows
output_row = [row, "value1", "value2"]
my_csv.write_row(output_row)
这将创建格式为 output_0001.csv
的输出文件名,每个文件包含 10 行.显然,您可以根据需要进行调整.
This would create output filenames of the form output_0001.csv
containing 10 rows per file. Obviously you can adjust this as needed.
您也可以改用 csv.DictWriter()
并为每一行传递一个字典.
You could also use a csv.DictWriter()
instead and pass a dictionary for each row.
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