德州市住房和城乡建设部网站,商标设计一般多少钱,网站添加缩略图,南宁论坛建站模板文章目录 场景#xff1a;解释#xff1a;关于文件长路径#xff1a;计算方法#xff1a; 场景#xff1a; Python 安装时#xff0c;会出现 Disable path length limit 的提示。
解释#xff1a;
在 Windows 操作系统中#xff0c;文件路径的长度是有限制的。在早期… 文章目录 场景解释关于文件长路径计算方法 场景 Python 安装时会出现 Disable path length limit 的提示。
解释
在 Windows 操作系统中文件路径的长度是有限制的。在早期版本的 Windows 中文件路径的长度限制为 260 个字符。这个限制是由于 Windows 操作系统使用的文件系统是 FAT32 或 NTFS这些文件系统都有文件路径长度的限制。
当你在 Windows 操作系统中安装 Python 时Python 安装程序会默认启用“启用长路径支持”选项这个选项可以让 Python 在 Windows 操作系统中使用长路径。长路径是指超过 260 个字符的文件路径。
然而启用长路径支持选项可能会导致一些问题例如某些旧版的应用程序可能无法处理长路径或者某些文件系统可能不支持长路径。因此如果你遇到了这些问题你可以选择在安装 Python 时禁用“启用长路径支持”选项。这样可以避免一些潜在的问题。
关于文件长路径
假设你有一个非常深层次的文件夹结构例如
C:\Users\username\Documents\Projects\Python\MyProject\src\my_package\sub_package1\sub_package2\sub_package3\sub_package4\sub_package5\sub_package6\sub_package7\sub_package8\sub_package9\sub_package10\sub_package11\sub_package12\sub_package13\sub_package14\sub_package15\sub_package16\sub_package17\sub_package18\sub_package19\sub_package20\sub_package21\sub_package22\sub_package23\sub_package24\sub_package25\sub_package26\sub_package27\sub_package28\sub_package29\sub_package30\sub_package31\sub_package32\sub_package33\sub_package34\sub_package35\sub_package36\sub_package37\sub_package38\sub_package39\sub_package40\sub_package41\sub_package42\sub_package43\sub_package44\sub_package45\sub_package46\sub_package47\sub_package48\sub_package49\sub_package50\sub_package51\sub_package52\sub_package53\sub_package54\sub_package55\sub_package56\sub_package57\sub_package58\sub_package59\sub_package60\sub_package61\sub_package62\sub_package63\sub_package64\sub_package65\sub_package66\sub_package67\sub_package68\sub_package69\sub_package70\sub_package71\sub_package72\sub_package73\sub_package74\sub_package75\sub_package76\sub_package77\sub_package78\sub_package79\sub_package80\sub_package81\sub_package82\sub_package83\sub_package84\sub_package85\sub_package86\sub_package87\sub_package88\sub_package89\sub_package90\sub_package91\sub_package92\sub_package93\sub_package94\sub_package95\sub_package96\sub_package97\sub_package98\sub_package99\sub_package100\sub_package101\sub_package102\sub_package103\sub_package104\sub_package105\sub_package106\sub_package107\sub_package108\sub_package109\sub_package110\sub_package111\sub_package112\sub_package113\sub_package114\sub_package115\sub_package116\sub_package117\sub_package118\sub_package119\sub_package120\sub_package121\sub_package122\sub_package123\sub_package124\sub_package125\sub_package126\sub_package127\sub_package128\sub_package129\sub_package130\sub_package131\sub_package132\sub_package133\sub_package134\sub_package135\sub_package136\sub_package137\sub_package138\sub_package139\sub_package140\sub_package141\sub_package142\sub_package143\sub_package144\sub_package145\sub_package146\sub_package147\sub_package148\sub_package149\sub_package150\sub_package151\sub_package152\sub_package153\sub_package154\sub_package155\sub_package156\sub_package157\sub_package158\sub_package159\sub_package160\sub_package161\sub_package162\sub_package163\sub_package164\sub_package165\sub_package166\sub_package167\sub_package168\sub_package169\sub_package170\sub_package171\sub_package172\sub_package173\sub_package174\sub_package175\sub_package176\sub_package177\sub_package178\sub_package179\sub_package180\sub_package181\sub_package182\sub_package183\sub_package184\sub_package185\sub_package186\sub_package187\sub_package188\sub_package189\sub_package190\sub_package191\sub_package192\sub_package193\sub_package194\sub_package195\sub_package196\sub_package197\sub_package198\sub_package199\sub_package200\sub_package201\sub_package202\sub_package203\sub_package204\sub_package205\sub_package206\sub_package207\sub_package208\sub_package209\sub_package210\sub_package211\sub_package212\sub_package213\sub_package214\sub_package215\sub_package216\sub_package217\sub_package218\sub_package219\sub_package220\sub_package221\sub_package222\sub_package223\sub_package224\sub_package225\sub_package226\sub_package227\sub_package228\sub_package229\sub_package230\sub_package231\sub_package232\sub_package233\sub_package234\sub_package235\sub_package236\sub_package237\sub_package238\sub_package239\sub_package240\sub_package241\sub_package242\sub_package243\sub_package244\sub_package245\sub_package246\sub_package247\sub_package248\sub_package249\sub_package250\sub_package251\sub_package252\sub_package253\sub_package254\sub_package255\sub_package256\sub_package257\sub_package258\sub_package259\sub_package260\my_file.txt这个文件路径长度为261个字符超过了260个字符的限制。如果你需要处理这样的文件路径那么你就需要启用长路径支持。
计算方法
在上面的例子中文件路径的长度为261个字符计算方法如下
文件路径中包含260个字符的文件夹名称和一个字符的文件名因此总共有261个字符。每个文件夹名称之间都有一个反斜杠字符 “”这个字符也要计算在内。文件路径的第一个字符是盘符 “C”也要计算在内。
因此文件路径的长度为
1 (盘符) 260 (文件夹名称和文件名的总长度) 260 (文件夹名称之间的反斜杠字符的数量) 261需要注意的是在实际的应用中文件路径的长度可能会受到其他因素的影响例如文件名中包含的空格、特殊字符等。因此在计算文件路径长度时需要考虑所有可能的因素。
