


Python provides an efficient csv module to process CSV files. You can do this by following these steps: Install the csv module. Use csv.reader() to read CSV files. Efficiently process large files line by line. Read and write CSV files in memory for faster processing. Use csv.writer() to write out a CSV file. Process CSV files in different formats through dialects. Customize delimiters and quotes to read non-standard CSV files.
Efficient methods and techniques for processing CSV files in Python
Practical case: reading and analyzing sales data CSV files
1. Install the csv
module
Use Python's pip
Install csv
Module:
pip install csv
2. Read CSV file
Use csv.reader()
Read CSV file:
import csv with open('sales_data.csv', 'r') as csv_file: csv_reader = csv.reader(csv_file) for row in csv_reader: print(row) # 打印每一行数据
3. Line-by-line processing
Use the line-by-line processing generator to process large files more efficiently:
import csv with open('sales_data.csv', 'r') as csv_file: csv_reader = csv.reader(csv_file) for row in csv_reader: process_row(row) # 调用自定义函数处理每一行
4. Read and write CSV in memory
Use the StringIO
class to load CSV data into memory for quick processing:
import csv from io import StringIO csv_data = """ 1,John Doe,100 2,Jane Smith,200 """ csv_file = StringIO(csv_data) csv_reader = csv.reader(csv_file) for row in csv_reader: print(row)
5. Write out the CSV file
Use csv.writer()
to write out the CSV file:
import csv with open('output.csv', 'w', newline='') as csv_file: csv_writer = csv.writer(csv_file) csv_writer.writerow(['ID', 'Name', 'Sales']) csv_writer.writerow([1, 'John Doe', 100])
6. Use dialects
to handle different dialects (such as Excel or Google Sheets) CSV file:
import csv with open('sales_data.csv', 'r') as csv_file: csv_reader = csv.reader(csv_file, dialect='excel') for row in csv_reader: print(row)
7. Set delimiter and quote character
Custom delimiter and quote character:
import csv with open('custom_data.csv', 'r') as csv_file: csv_reader = csv.reader(csv_file, delimiter=';', quotechar='"') for row in csv_reader: print(row)
The above is the detailed content of Efficient methods and techniques for processing CSV files in Python. For more information, please follow other related articles on the PHP Chinese website!

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于Seaborn的相关问题,包括了数据可视化处理的散点图、折线图、条形图等等内容,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于进程池与进程锁的相关问题,包括进程池的创建模块,进程池函数等等内容,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于简历筛选的相关问题,包括了定义 ReadDoc 类用以读取 word 文件以及定义 search_word 函数用以筛选的相关内容,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于数据类型之字符串、数字的相关问题,下面一起来看一下,希望对大家有帮助。

VS Code的确是一款非常热门、有强大用户基础的一款开发工具。本文给大家介绍一下10款高效、好用的插件,能够让原本单薄的VS Code如虎添翼,开发效率顿时提升到一个新的阶段。

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于numpy模块的相关问题,Numpy是Numerical Python extensions的缩写,字面意思是Python数值计算扩展,下面一起来看一下,希望对大家有帮助。

pythn的中文意思是巨蟒、蟒蛇。1989年圣诞节期间,Guido van Rossum在家闲的没事干,为了跟朋友庆祝圣诞节,决定发明一种全新的脚本语言。他很喜欢一个肥皂剧叫Monty Python,所以便把这门语言叫做python。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

WebStorm Mac version
Useful JavaScript development tools

Dreamweaver Mac version
Visual web development tools

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

Notepad++7.3.1
Easy-to-use and free code editor