head() and tail() in Data Analysis Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the head() function do in a DataFrame?

The head() function shows the first few rows of a DataFrame, usually the first 5 by default. It helps you quickly see the start of your data.

beginner

What is the purpose of the tail() function in data analysis?

The tail() function shows the last few rows of a DataFrame, usually the last 5 by default. It helps you quickly check the end of your data.

beginner

How can you change the number of rows shown by head() or tail()?

You can pass a number inside the parentheses, like head(3) or tail(10), to show that many rows from the start or end.

beginner

Why is it useful to use head() and tail() when exploring data?

They let you quickly check the structure and content of your data without loading everything. This helps find errors or understand data format early.

beginner

If a DataFrame has 100 rows, what will df.tail(5) show?

It will show the last 5 rows, rows 95 to 99, giving you a quick look at the end of the data.

What is the default number of rows shown by head() in pandas?

A 10

B 5

C 1

D All rows

head() shows the first 5 rows by default.

Which function shows the last rows of a DataFrame?

A tail()

B end()

C first()

D head()

tail() shows the last rows of a DataFrame.

How do you show the first 3 rows of a DataFrame named df?

A df.head(3)

B df.tail(3)

C df.first(3)

D df.show(3)

Use df.head(3) to show the first 3 rows.

Why might you use head() or tail() when working with big data?

A To see all data at once

B To delete rows

C To quickly check a small part of data

D To sort data

head() and tail() help quickly check a small part of data without loading everything.

If you want to see the last 10 rows of a DataFrame, which command is correct?

A df.head(10)

B df.end(10)

C df.last(10)

D df.tail(10)

Use df.tail(10) to see the last 10 rows.

Explain how and why you would use the head() and tail() functions when starting to analyze a new dataset.

Think about how you peek at the start and end of a book to get an idea of its content.

Describe a situation where using tail() would be more helpful than head().

Imagine you want to see the latest sales records in a big sales dataset.