查找数据框中两列的交集

Question

I have a dataset with two columns, one has area names and one has timings. I have found the topmost frequently occurring area names as well as times. Now, I wish to find how many times, these two occur together, as in how many times do I have a frequently occurring name and a frequently occurring time in the same row.

I tried this but didn't work:

a = (3,1,93,34,29) #topmost frequntly occurring areas 
b = (8,9,17,18,7) #topmost frequently occurring timings (in 24 hr)

def update(df):
    for i in range(0,len(df)):
        if df.iloc[i,0] == any(a):
           if df.iloc[i,9] == any(b):
              arr1.append(df.iloc[i,:])

update(df)

it just gives an empty array:

In [40]: arr1 Out[40]: []

Answer 1

解决此问题的一种方法是仅提取包含出现频率最高的区域的行，然后从该数据子集中仅选择包含出现频率最高的行。