Important QnA – Dataframe functions for IP class 12

In this article we will discuss QnA – Dataframe functions.

Objective Type Questions – dataframe functions

Click here to read the notes for the same.

Fill in the blanks:

1. A _________function is used to display top rows (n) from dataframe.
2. A _______ function is used to display bottom rows (n) from dataframe.
3. _____ refers to passing True and False value as an index in Dataframes.
4. To pass index label _________ keyword is used to in pd.dataFrame() function.
5. By default you can display ____ no. of top/bottom rows using head()/tail() function.

Fill in the blanks Answers for dataframe functions:

1. head()
2. tail()
3. ignore_index
4. index
5. 5 (five)

Now in the nest section we will see MCQs from the Dataframe functions topic:

MCQs

1 Choose the correct function to rename city columns to location using rename() function:

a. df.rename(columns={‘City’:’Location’})

b. df.rename(columns={‘City’=’Location’})

c. df.rename(‘City’=’Location’)

d. df.rename(df.columns(‘City’,’Location’))

2 Which of the following statement(s) is/are correct with respect to df.columns properties to rename columns

1. All columns must be specified
2. Columns must be in the form of a list
3. Old column names not required
4. Columns can be specified with columns number

a Only 1 is correct

b 1, 2 and 3 are correct

c 1 and 3 are correct

d All of them are correct

3 df.index properties ca be used to

a rename rows

b rename columns

c rename rows and columns both

d None of these

4. To display 2 rows from the top in the dataframe, which of the following statement is correct:

a df.head()=2

b. df.head(n=2)

c. df.head(range(2))

d. All of the above

Error based Questions – Dataframe functions

1. Find errors from the given code fragments:

df.DataFrame({'S.NO':[1,2,3],'Name':['Sapan','Vivek','Vishal']})
df.rename[{'S.No':'SNO','Name':'Sname'}]
df.index=(1,2,3)

2.

df.DataFrame({'S.NO':[1,2,3],'Name':['Sapan','Vivek','Vishal']})
df.columns=('SNO','Name')
df.index=[1 to 3]

3.

df.DataFrame({'S.NO':[1,2,3],'Name':['Sapan','Vivek','Vishal']})
df.head(3)
df.tail(3)

Application Based questions

Watch this video understand the topic and answers.

1 Consider above dataframe and rename columns using rename() function and df.columns properties.

Old column Names : City, Email, Fees

New Column Names: Location, ContactDetals, Charges

Sol.

1 Using Rename Function:

df.rename(columns={'City':'Location','Email':'ContactDetails','Charges'})

2 Using columns properties:

df.columns=['Location','ContactDetails','Charges']

2 Consider above dataframe and rename rows using rename() function and df.index properties.

New indexes: 1,2,3,4

Sol.

1 Using rename function:

df.rename(index={0:1,1:2,2:3,3:4})

2 Using index properties:

df.index=[1,2,3,4]

3 Write a statement to rename rows and columns together for the dataframe.

df.rename(columns={'City':'Location','Email':'ContactDetails','Fees':'Charges'}, index={0:1,1:2,2:3,3:4})

4 Write statement to display top and botton 3 rows from dataframe.

Sol.:

print(df.head(3))  or   print(df.head(n=3)) 

print(df.head(3))  or   df.tail(n=3)

Click here to read topic wise notes, assignments and practical questions for class 12 IP.

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