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exercise/built_in_module_test.py
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+# python中的常用的内置模块
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+import sys
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+import time
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+# 文件输入输出
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+# import os
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+# import calendar
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+# 网络请求相关
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+import urllib.request
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+
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+# import json
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+# 正则表达式
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+# import re
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+# import math
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+# import decimal
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+# import logging
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+print('----------------使用sys模块---------------------')
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+# 获取整数24在python中占用的字节大小
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+print(sys.getsizeof(24))
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+print(sys.getsizeof(45))
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+print(sys.getsizeof(True))
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+print(sys.getsizeof(False))
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+# 输出单位为秒
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+print(time.time())
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+print(time.localtime(time.time()))
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+print('----------------使用os模块---------------------')
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+print(urllib.request.urlopen('http://www.baidu.com').read())
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