Python文件基本操作open函数应用与示例详解

file = open(filename, mode, [encoding], [errors])

with open('example.txt', 'r') as file:
    for line in file:
        print(line)

with open('example.txt', 'r') as file:
    content = file.read()
    print(content)

with open('example.txt', 'r') as file:
    # 文件操作
# 文件已自动关闭

with open('output.txt', 'w') as file:
    file.write("This is some text.\n")
    file.write("Writing to a text file.")

with open('output.txt', 'a') as file:
    file.write("This text is appended.")

with open('binary_data.dat', 'wb') as file:
    binary_data = bytes([0, 1, 2, 3, 4])
    file.write(binary_data)

with open('textfile.txt', 'r') as file:
    for line in file:
        print(line)

with open('output.txt', 'w') as file:
    file.write("This is some

 text.\n")
    file.write("Writing to a text file.")

with open('data.txt', 'r') as file:
    for line in file:
        parts = line.strip().split(',')
        # 处理每一行数据

try:
    with open('data.txt', 'r') as file:
        # 文件操作
except FileNotFoundError:
    print("File not found.")
except Exception as e:
    print("An error occurred:", str(e))

with open('binary_data.dat', 'rb') as file:
    data = file.read()
    print(data)

with open('binary_data.dat', 'wb') as file:
    binary_data = bytes([0, 1, 2, 3, 4])
    file.write(binary_data)

with open('source.dat', 'rb') as source_file, open('destination.dat', 'wb') as dest_file:
    chunk_size = 1024
    while True:
        chunk = source_file.read(chunk_size)
        if not chunk:
            break
        dest_file.write(chunk)

try:
    with open('binary_data.dat', 'rb') as file:
        # 文件操作
except FileNotFoundError:
    print("File not found.")
except Exception as e:
    print("An error occurred:", str(e))