Python 檔案讀寫（File I/O）完整教學 | Python

with open("example.txt", "r", encoding="utf-8") as f:
    content = f.read()
    print(content)

with open("example.txt", "r", encoding="utf-8") as f:
    content = f.read()        # 一次讀取全部內容

with open("example.txt", "r", encoding="utf-8") as f:
    first_line = f.readline() # 一次讀取一行

with open("example.txt", "r", encoding="utf-8") as f:
    lines = f.readlines()     # 讀取所有行，回傳列表
    print(lines)  # 輸出：['第一行\n', '第二行\n', '第三行\n']

with open("large_file.txt", "r", encoding="utf-8") as f:
    for line in f:
        print(line.strip())

# 寫入（覆蓋原有內容）
with open("output.txt", "w", encoding="utf-8") as f:
    f.write("第一行\n")
    f.write("第二行\n")

# 附加內容到檔案末尾
with open("output.txt", "a", encoding="utf-8") as f:
    f.write("這行會附加在最後\n")

# 寫入多行
lines = ["蘋果\n", "香蕉\n", "橘子\n"]
with open("fruits.txt", "w", encoding="utf-8") as f:
    f.writelines(lines)

with open("chinese.txt", "w", encoding="utf-8") as f:
    f.write("你好，Python！")

with open("chinese.txt", "r", encoding="utf-8") as f:
    print(f.read())  # 輸出：你好，Python！

from pathlib import Path

p = Path("mydir/myfile.txt")
print(p.name)    # 輸出：myfile.txt
print(p.stem)    # 輸出：myfile
print(p.suffix)  # 輸出：.txt
print(p.parent)  # 輸出：mydir
print(p.exists())  # 檔案是否存在

from pathlib import Path

Path("new_folder").mkdir(parents=True, exist_ok=True)

Path("hello.txt").write_text("Hello!", encoding="utf-8")
content = Path("hello.txt").read_text(encoding="utf-8")
print(content)  # 輸出：Hello!

# 列出目錄中所有 .py 檔案
for py_file in Path(".").glob("*.py"):
    print(py_file)