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Python-26-(宽表和长表互换)

  • 2026-06-28 02:41:12
Python-26-(宽表和长表互换)
Excel有提到宽表和长表。Excel-48（宽表 vs 长表）
现在我们看下Python的方法怎么完成这两个之间的互相转换。
宽表→长表
长表→宽表
方法①：stack()
方法①：unstack()
方法②：melt()
方法②：pivot_table()
stack() & unstak()
melt()：宽表转长表
melt(id_vars='',var_name='',value_name='')
id_vars,固定不变的列，var_name原来的“列索引”转到行后的“列名”，value_name转换后的值对应的列名
pivot_table():长表转宽表
pivot_table()即数据透视表，关键参数：行，列，值，聚合方式分别对应的参数为index, columns, value, aggfunc。
~~完成了
Day 26
#Python #表格转换 #数据处理
在某个时刻，会突然活得平静，这是一种灵魂的指引。
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  1. CONNECT:[ UseTime:0.000657s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000894s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000351s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000542s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000537s ]
  8. SELECT * FROM `article` WHERE `id` = 498091 LIMIT 1 [ RunTime:0.000547s ]
  9. UPDATE `article` SET `lasttime` = 1783047179 WHERE `id` = 498091 [ RunTime:0.026359s ]
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