python 代码块（模板）

最新推荐文章于 2024-09-23 14:17:14 发布

bandiaoz_cjl

最新推荐文章于 2024-09-23 14:17:14 发布

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分类专栏： VScode

本文链接：https://blog.youkuaiyun.com/weixin_43860866/article/details/118801251

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这篇博客介绍了在Python中如何实现快速的输入输出操作，包括使用`input_array`宏来快速转换输入为整数列表，以及`fast_io`模块来提升输入输出效率。通过定义`FastIO`和`IOWrapper`类，实现了类似C++风格的快速读写功能，旨在提高代码运行速度。

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{
	// 输入int数组
	"input_array": { 
		"prefix": "ina",
		"body": "list(map(int, input().split()))",
		"description": "input_array"
	},

	// 快读
	"fast_io": {
		"prefix": "fast_io",
		"body": [
			"import os",
			"import sys",
			"from io import BytesIO,IOBase",
			"",
			"# region fastio",
			"BUFSIZE = 8192",
			"",
			"class FastIO(IOBase):",
			"    newlines = 0",
			"",
			"    def __init__(self,file):",
			"        self._fd = file.fileno()",
			"        self.buffer = BytesIO()",
			"        self.writable = \"x\" in file.mode or \"r\" not in file.mode",
			"        self.write = self.buffer.write if self.writable else None",
			"",
			"    def read(self):",
			"        while True:",
			"            b = os.read(self._fd,max(os.fstat(self._fd).st_size,BUFSIZE))",
			"            if not b:",
			"                break",
			"            ptr = self.buffer.tell()",
			"            self.buffer.seek(0,2),self.buffer.write(b),self.buffer.seek(ptr)",
			"        self.newlines = 0",
			"        return self.buffer.read()",
			"",
			"    def readline(self):",
			"        while self.newlines == 0:",
			"            b = os.read(self._fd,max(os.fstat(self._fd).st_size,BUFSIZE))",
			"            self.newlines = b.count(b\"\\n\")+(not b)",
			"            ptr = self.buffer.tell()",
			"            self.buffer.seek(0,2),self.buffer.write(b),self.buffer.seek(ptr)",
			"        self.newlines -= 1",
			"        return self.buffer.readline()",
			"",
			"    def flush(self):",
			"        if self.writable:",
			"            os.write(self._fd,self.buffer.getvalue())",
			"            self.buffer.truncate(0),self.buffer.seek(0)",
			"",
			"class IOWrapper(IOBase):",
			"    def __init__(self,file):",
			"        self.buffer = FastIO(file)",
			"        self.flush = self.buffer.flush",
			"        self.writable = self.buffer.writable",      
			"        self.write = lambda s:self.buffer.write(s.encode(\"ascii\"))",
			"        self.read = lambda:self.buffer.read().decode(\"ascii\")",
			"        self.readline = lambda:self.buffer.readline().decode(\"ascii\")",
			"",
			"sys.stdin,sys.stdout = IOWrapper(sys.stdin),IOWrapper(sys.stdout)",
			"input = lambda:sys.stdin.readline().rstrip(\"\\r\\n\")",
			"",
			"# endregion"
		],
	}
}