str.strip() for whitespace in Pandas - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the str.strip() method do in pandas?

The str.strip() method removes leading and trailing whitespace characters from each string in a pandas Series or DataFrame column.

beginner

How do you apply str.strip() to a pandas Series named names?

You use names.str.strip() to remove whitespace from each string in the Series names.

beginner

True or False: str.strip() removes whitespace only from the start of the string.

False. str.strip() removes whitespace from both the start and the end of the string.

intermediate

What happens if you use str.strip() on a pandas Series with some NaN values?

The NaN values remain unchanged; str.strip() only affects string values.

beginner

How can str.strip() help when cleaning data?

It removes unwanted spaces that can cause errors or mismatches when comparing or analyzing text data.

What does str.strip() remove from strings in pandas?

A Leading and trailing whitespace

B Only leading whitespace

C Only trailing whitespace

D All spaces inside the string

str.strip() removes whitespace from both the start and end of strings, not inside the string.

How do you apply str.strip() to a pandas DataFrame column named col?

A df['col'].str.strip()

B df.col.strip()

C df.str.strip('col')

D strip(df['col'])

Use df['col'].str.strip() to apply the method to each string in the column.

If a string is ' hello ', what will str.strip() return?

A ' hello'

B 'hello'

C 'hello '

D ' hello '

str.strip() removes spaces from both ends, so the result is 'hello'.

What happens to NaN values when using str.strip() on a pandas Series?

A They become empty strings

B They are removed from the Series

C They stay as <code>NaN</code>

D They cause an error

NaN values remain unchanged when using str.strip().

Which of these is NOT a use of str.strip() in data cleaning?

A Removing extra spaces around text

B Preparing text for analysis

C Preventing errors in string comparisons

D Fixing inconsistent capitalization

str.strip() does not change capitalization; it only removes whitespace.

Explain how str.strip() works in pandas and why it is useful for cleaning text data.

Think about spaces at the start and end of words in a list of names.

Describe what happens when str.strip() is used on a pandas Series containing some missing values (NaN).

Consider how pandas handles missing data in string operations.