In [5]: ser == np.nan Out[5]: 0 False 1 False 2 False 3 False dtype: bool 这两个函数也被定义为 Series 和 DataFrames 上的方法。 In [6]: ser.isnull() Out[6]: 0 False 1 False 2 True 3 False dtype: bool 在DataFrames 上测试: In [7]: df = pd.DataFrame({'A': [1, ...
We will add one column status which will store pass or fail value for each student based on the mark they scored. Pass mark is 60. import pandas as pd import numpy as np df= pd.read_csv('D:\\my_data\\student.csv') # DataFrame from csv file data df['status']=np.where(df['...
Python - Pandas Dataframe Check if column value is in, Pandas Dataframe Check if column value is in column list. data = {'id': [12,112], 'idlist': [ [1,5,7,12,112], [5,7,12,111,113]] } df=pd.DataFrame.from_dict (data) I need to check and see if id is in the idlist...