Python合并列表、字典、字符串、CSV文件、多文件技巧

list1 = [1, 2, 3]
list2 = [4, 5, 6]
result = list1 + list2
print(result)

[1, 2, 3, 4, 5, 6]

dict1 = {'a': 1, 'b': 2}
dict2 = {'c': 3, 'd': 4}
dict1.update(dict2)
print(dict1)

{'a': 1, 'b': 2, 'c': 3, 'd': 4}

strings = ['Hello', 'World', '!']
result = ' '.join(strings)
print(result)

Hello World !

import pandas as pd
# 读取CSV文件
data1 = pd.read_csv('file1.csv')
data2 = pd.read_csv('file2.csv')
# 合并CSV文件
result = pd.concat([data1, data2], axis=0)
# 保存合并后的结果
result.to_csv('merged.csv', index=False)

import csv
# 打开要写入的文件
with open('merged.csv', 'w', newline='') as outfile:
    writer = csv.writer(outfile)
    # 打开第一个文件，读取数据并写入新文件
    with open('file1.csv', 'r') as file1:
        reader = csv.reader(file1)
        for row in reader:
            writer.writerow(row)
    # 打开第二个文件，读取数据并写入新文件
    with open('file2.csv', 'r') as file2:
        reader = csv.reader(file2)
        for row in reader:
            writer.writerow(row)
print("CSV文件合并完成")

import os
import shutil
# 源文件夹列表
source_dirs = ['dir1', 'dir2', 'dir3']
# 目标文件夹
target_dir = 'merged'
# 创建目标文件夹
os.makedirs(target_dir, exist_ok=True)
# 遍历源文件夹列表
for source_dir in source_dirs:
    # 遍历源文件夹中的所有文件
    for filename in os.listdir(source_dir):
        source_path = os.path.join(source_dir, filename)
        target_path = os.path.join(target_dir, filename)
        # 复制文件到目标文件夹中
        shutil.copy2(source_path, target_path)
print("文件合并完成")