如何使用python将csv数据输出到终端

Question

我正在编写一个脚本，将 csv 文件读取到 psql 表，然后对数据进行排序并将其导出到一个新文件。如何将导出到 csv 文件的相同数据打印到终端以将其显示为表格？

这是我的代码：

import psycopg2

import pandas as pd

class Products(object):

    def __init__(self):

        self.db_connection = psycopg2.connect("host=localhost dbname=rd_assignment user=postgres")

        self.db_cur = self.db_connection.cursor()

    def add_column(self):

        """This method adds a column to the products database table. It checks if the table is empty before

        inserting the csv file."""

        self.db_cur.execute("ALTER TABLE products ADD COLUMN IF NOT EXISTS is_active BOOLEAN NOT NULL;")

        self.db_cur.execute("SELECT COUNT(*) FROM products;")

        rows = self.db_cur.fetchall()

        if rows[0][0] < 20:

            self.db_cur.execute(

                "COPY products FROM '/Users/leroy/PycharmProjects/rd_assignment/products.csv' DELIMITERS ',' CSV;")

            self.db_connection.commit()

    def sort_highest(self):

        """This method outputs the products to a csv file according to the highest amount"""

        sort_highest = "COPY (SELECT * FROM products order by amount desc) TO STDOUT DELIMITER ';' CSV HEADER"

        with open("highest_amount.csv", "w") as file:

            self.db_cur.copy_expert(sort_highest, file)

        r = pd.read_csv('/Users/leroy/PycharmProjects/rd_assignment/highest_amount.csv')

        print(r.head(20))

    def get_active(self):

        """This method outputs the active products in the database to a csv file"""

        sort_active = "COPY (SELECT * FROM products WHERE is_active = True) TO STDOUT DELIMITER ';' CSV HEADER"

        with open("active_products.csv", "w") as file:

            self.db_cur.copy_expert(sort_active, file)

Answer 1

尝试漂亮。from prettytable import PrettyTablex = PrettyTable()x.field_names = ["Sl.n0", "date1", "date2", "comments","Boolean"]with open('file.csv') as f:&nbsp; line = f.readline()&nbsp; while line:&nbsp; &nbsp; x.add_row(line.rstrip().split(','))&nbsp; &nbsp; line = f.readline()print x使用 pip 安装： pip install PrettyTable