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作者 painkiller 在 PTT [ Python ] 看板的留言(推文), 共58則
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6F推: 還是用anaconda python吧04/17 01:49
1F→: 查查 pandas.cut怎麼用02/09 23:34
1F→: 你的'fish = '會把舊的data frame洗掉01/31 00:33
3F→: 迴圈外 'fish_all = ' 先讀第一個url01/31 09:15
4F→: 迴圈內 fish_all = pd.concat([fish_all, fish] ...01/31 09:16
5F→: 或是append01/31 09:16
1F→: df['年'].astype(str)+'.'+df['月'].astype(str)09/26 21:17
5F推: 1. a = sort([int(i) for i in a])05/03 09:25
6F→: 2. [a[i] for i in range(len(a)) if a[i] == a[0]+i]05/03 09:26
7F→: 一定要用str存數字的話再轉回去就好了05/03 09:27
1F→: 可能要先找出index,如 df[df.name == 'vip*'].index10/13 23:51
2F→: 頭尾有vip另外處理10/13 23:52
3F→: 其他before/after 就index array +1/-1就可以取值了10/13 23:52
5F→: 看來是apple的電腦,主要用來科學運算的話用anaconda吧07/07 02:12
1F推: 最簡單的方法還是 df.plot.bar(x='a',y='b')03/25 22:33
2F→: 如果你不想用pandas內建的話要把timestamp轉成別的03/25 22:34
3F→: 比如說datetime之類的... pd.to_datetime(df['a'])03/25 22:36
4F推: pandas的timestamp跟datetime兩者不相容是有點擾人...03/26 10:18
5F推: 要不就先轉成datetime用matplotlib畫03/26 10:27
6F→: 然後用matplotlib.date設定formatter跟locator03/26 10:29
7F→: 繼續用df.plot的話 str轉timestamp後還要再轉一次03/26 10:29
8F→: df['a']=df.a.map(lambda t: t.strftime('%H-%M-%S'))03/26 10:30
8F推: numpy.trapz 把每個數據點都積一遍03/17 02:15
9F→: 然後numpy.interp1d找出50%面積的x值03/17 02:15
10F→: 當然數據量如果很大你就binary search去猜吧03/17 02:16
5F推: 如果單位是兩種,只是square feet字串長不一樣02/21 10:11
6F→: df[df.unit != 'm2'].Value*0.092902/21 10:16