Python 在dataframe中将列拆分为多个具有特定名称的列
我有以下数据帧:Python 在dataframe中将列拆分为多个具有特定名称的列,python,pandas,dataframe,Python,Pandas,Dataframe,我有以下数据帧: pri sec TOM AB,CD,EF JACK XY,YZ HARRY FG NICK KY,NY,SD,EF,FR 我需要以下列名的输出,如下所示(基于“sec”列中存在多少分隔字段): 我能得到一些建议吗?使用++: 如果需要,请添加: 尝试以下代码(解释为注释)。它在“秒”列中查找项目的最大长度,并相应地创建名称: maxlen = max(list(map(lambda x: len(x.split(",")) ,df.sec))) # fi
pri sec
TOM AB,CD,EF
JACK XY,YZ
HARRY FG
NICK KY,NY,SD,EF,FR
我需要以下列名的输出,如下所示(基于“sec”列中存在多少分隔字段):
我能得到一些建议吗?使用++:
如果需要,请添加:
尝试以下代码(解释为注释)。它在“秒”列中查找项目的最大长度,并相应地创建名称:
maxlen = max(list(map(lambda x: len(x.split(",")) ,df.sec))) # find max length in 'sec' column
cols = ["sec"+str(x) for x in range(maxlen)] # create new column names
datalist = list(map(lambda x: x.split(","), df.sec)) # create list from entries in "sec"
newdf = pd.DataFrame(data=datalist, columns=cols) # create dataframe of new columns
newdf = pd.concat([df, newdf], axis=1) # add it to original dataframe
print(newdf)
输出:
pri sec sec0 sec1 sec2 sec3 sec4
0 TOM AB,CD,EF AB CD EF None None
1 JACK XY,YZ XY YZ None None None
2 HARRY FG FG None None None None
3 NICK KY,NY,SD,EF,FR KY NY SD EF FR
df.join(df['sec'].str.split(',',expand=True)。添加前缀('sec'))
以添加前缀。@Zero-谢谢。您好,我有一个类似的问题,但是我的panda数组的形式为:[1,3,5,…..2]。每个单元格中有50个值。我尝试使用.str.split(“,”,expand=True),但它似乎不起作用work@Kiann-那么什么是打印(df['column'].apply(type))?有列表或字符串吗?嗨@jezrael,它显示为类列表。
df = df.join(df['sec'].str.split(',', expand=True).add_prefix('sec').fillna(np.nan))
print (df)
pri sec sec0 sec1 sec2 sec3 sec4
0 TOM AB,CD,EF AB CD EF NaN NaN
1 JACK XY,YZ XY YZ NaN NaN NaN
2 HARRY FG FG NaN NaN NaN NaN
3 NICK KY,NY,SD,EF,FR KY NY SD EF FR
maxlen = max(list(map(lambda x: len(x.split(",")) ,df.sec))) # find max length in 'sec' column
cols = ["sec"+str(x) for x in range(maxlen)] # create new column names
datalist = list(map(lambda x: x.split(","), df.sec)) # create list from entries in "sec"
newdf = pd.DataFrame(data=datalist, columns=cols) # create dataframe of new columns
newdf = pd.concat([df, newdf], axis=1) # add it to original dataframe
print(newdf)
pri sec sec0 sec1 sec2 sec3 sec4
0 TOM AB,CD,EF AB CD EF None None
1 JACK XY,YZ XY YZ None None None
2 HARRY FG FG None None None None
3 NICK KY,NY,SD,EF,FR KY NY SD EF FR