小编San*_*ndy的帖子

我有一个df像这样的DataFrame ：

Pattern    String                                       
101        hi, how are you?
104        what are you doing?
108        Python is good to learn.

我想为字符串列创建ngrams。我已经使用split()和创建了unigramstack()

new= df.String.str.split(expand=True).stack()

但是，我想创建ngram（bi，tri，quad等）

据帧(TEST1):

cons_flag     
Mas
Mas
Wood
Wood
Wood
Mas
Conc
Wood

OUTPUT:

cons_flag   new_var
Mas MASOM
Mas MASOM
Wood    MASOM
Wood    MASOM
Wood    MASOM
Mas MASOM
Conc    MASOM
Wood    MASOM

使用代码:

for x in test1['cons_flag']:
    if x.find('Mas'):
        test1['new_var']="MASOM"
    elif x.find('Wood'):
        test1['new_var']= "WOODEN"

我的问题是new_var列值不按照我的逻辑更新.