1. Given the data below, construct a Pandas program to generate and display a DataFrame with index labels  df = pd.DataFrame(          {'ord_no':[70001,np.nan,70002,70004,np.nan,70005,np.nan,70010,70003,70012,np.nan,70013],      'purch_amt':[150.5,270.65,65.26,110.5,948.5,2400.6,5760,1983.43,2480.4,250.45, 75.29,3045.6],      'ord_date': ['2012-10-05','2012-09-10',np.nan,'2012-08-17','2012-09-10','2012-07-27','2012-09-10','2012-10-10','2012-10-10','2012-06-27','2012-08-17','2012-04-25'],      'customer_id':[3002,3001,3001,3003,3002,3001,3001,3004,3003,3002,3001,3001],      'salesman_id':[5002,5003,5001,np.nan,5002,5001,5001,np.nan,5003,5002,5003,np.nan]}) 2. Write a Pandas program to detect missing values of a given DataFrame. Display True or False. 3. Remove all the columns and rows that has missing values

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Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.