python 類，python筆記03_IO編程

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with open('/path/to/file', 'r') as f:  print(f.read())  f.write('Hello, world!')  f.close()  
StringIO()  
f = BytesIO()  
f.write('中文'.encode('utf-8'))  
print(f.getvalue())  >>> import os  
>>> os.name # 操作系統類型  
>>> os.uname()  
>>> os.environ  
>>> os.environ.get('PATH')  
os.path.abspath('.')  
os.path.join('/Users/michael', 'testdir')  
os.mkdir('/Users/michael/testdir')  
os.rmdir('/Users/michael/testdir')  
os.path.split('/Users/michael/testdir/file.txt')  
os.path.splitext()  
os.rename('test.txt', 'test.py')  
os.remove('test.py')  
[x for x in os.listdir('.') if os.path.isdir(x)]  
[x for x in os.listdir('.') if os.path.isfile(x) and os.path.splitext(x)[1]=='.py']  pickle.dumps(d)  
>>> f = open('dump.txt', 'wb')  
>>> pickle.dump(d, f)  d = pickle.load(f)  
>>> f.close()  
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print(json.dumps(s, default=lambda obj: obj.__dict__))