如何在Python中打印或保存所有数据？

data = [1, 2, 3, 4, 5]
for item in data:
    print(item)

data = {'a': 1, 'b': 2, 'c': 3}
for key, value in data.items():
    print(f"{key}: {value}")

import pandas as pd

data = {'a': [1, 2, 3], 'b': [4, 5, 6]}
df = pd.DataFrame(data)
print(df)

data = [1, 2, 3, 4, 5]

# 保存到文本文件
with open('data.txt', 'w') as file:
    for item in data:
        file.write(f"{item}\n")

# 保存到CSV文件（使用Pandas）
import pandas as pd

data = {'a': [1, 2, 3], 'b': [4, 5, 6]}
df = pd.DataFrame(data)
df.to_csv('data.csv', index=False)

import sqlite3

conn = sqlite3.connect('example.db')
c = conn.cursor()

# 创建表
c.execute('''CREATE TABLE data (id INTEGER PRIMARY KEY, value INTEGER)''')

# 插入数据
data = [1, 2, 3, 4, 5]
for item in data:
    c.execute("INSERT INTO data (value) VALUES (?)", (item,))

conn.commit()
conn.close()

import pandas as pd

# 分批读取大文件
chunksize = 10 ** 6  # 每次读取100万行
for chunk in pd.read_csv('large_file.csv', chunksize=chunksize):
    print(chunk)

import os

# 检查文件路径是否存在
if not os.path.exists('data'):
    os.makedirs('data')

# 保存文件
with open('data/data.txt', 'w') as file:
    file.write('Hello, World!')