python如何处理文件

with open('example.txt', 'r', encoding='utf-8') as f:
    content = f.read()  # 读取全部内容
    print(content)

with open('example.txt', 'r', encoding='utf-8') as f:
    for line in f:
        print(line.strip())  # 去除换行符

# 覆盖写入
with open('output.txt', 'w', encoding='utf-8') as f:
    f.write("这是第一行\n")
    f.write("这是第二行\n")
<h1>追加内容</h1><p>with open('output.txt', 'a', encoding='utf-8') as f:
f.write("这是追加的一行\n")</p>

import csv
<h1>写入CSV</h1><p>with open('data.csv', 'w', newline='', encoding='utf-8') as f:
writer = csv.writer(f)
writer.writerow(['姓名', '年龄'])
writer.writerow(['张三', 25])</p><h1>读取CSV</h1><p>with open('data.csv', 'r', encoding='utf-8') as f:
reader = csv.reader(f)
for row in reader:
print(row)</p>

import json
<h1>写入JSON</h1><p>data = {'name': '李四', 'age': 30}
with open('data.json', 'w', encoding='utf-8') as f:
json.dump(data, f, ensure_ascii=False, indent=2)</p><h1>读取JSON</h1><p>with open('data.json', 'r', encoding='utf-8') as f:
data = json.load(f)
print(data)</p>

from pathlib import Path
<p>file_path = Path('folder') / 'example.txt'
if file_path.exists():
with open(file_path, 'r', encoding='utf-8') as f:
print(f.read())
else:
print("文件不存在")</p>

try:
    with open('example.txt', 'r', encoding='utf-8') as f:
        content = f.read()
except FileNotFoundError:
    print("文件未找到")
except PermissionError:
    print("没有权限访问该文件")