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import os
path = r"C:1.txt"
print(os.path.exists(path))
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2. 遍历目录
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import os
dirname = r"C:output"
for filename in os.listdir(dirname):
filepath = os.path.join(dirname, filename)
print('=' * 60)
print('文件名: ', filename)
print('文件路径：', filepath)
with open(filepath, 'r', encoding='utf-8') as f:
pass
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3. 文件的打开和关闭
方式1
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filepath = r"C:1.txt"
f = open(filepath, 'r', encoding='utf-8')
f.close()
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方式2：使用with语句，执行完后会自动关闭文件
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filepath = r"C:1.txt"
with open(filepath, 'r', encoding='utf-8') as f:
pass
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4. 读取文本文件
f.read() 一次读取所有文本（读到EOF为止）
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filepath = r"C:1.txt"
with open(filepath, 'r', encoding='utf-8') as f:
text = f.read()
for line in text.split('n'):
print(line)
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for line in f 迭代一行一行读取，适用于读取大文件，可节省内存
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filepath = r"C:1.txt"
with open(filepath, 'r', encoding='utf-8') as f:
for line in f:
line = line.strip('n')
print(line)
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f.readline() 读取1行
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filepath = r"C:1.txt"
with open(filepath, 'r', encoding='utf-8') as f:
print(f.readline())
print(f.readline())
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f.readlines() -> List[str] 读取所有行
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filepath = r"C:1.txt"
with open(filepath, 'r', encoding='utf-8') as f:
for line in f.readlines():
line = line.strip('n')
print(line)
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5. 写文本
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