Python study group: Week 3

Which of the following are common errors in python?

• Missing colon at the end of a statement

• Unexpected indentation

• Mismatched brackets

• Index error

When debugging an error in your code, which should you do first?

• Insert a print statement

• Read the error message

• Refer to the documentation

• Read through your code again

What is the primary data structure in pandas for storing and manipulating data?

• Lists

• Tuples

• Arrays

• DataFrames

How can you select a specific column from a pandas dataframe?

• df.iloc['column_name']

• df.loc['column_name']

• df.head(column_name)

• df['column_name']

What method is used to drop rows with missing values in a pandas dataframe?

• clean()

• remove()

• dropna()

• filter()

Which of the following operations are pandas dataframe methods?

• merge

• na

• dropnull

• groupby

How can you create a new column in a pandas dataframe based on existing STRING columns?

• df['new_column'] = df['col1'] * df['col2']

• df['new_column'] = df['col1'] + df['col2']

• df['new_column'] = df['col1'] - df['col2']

• df['new_column'] = df['col1'] / df['col2']

Which of the following is most correct about the pandas dataframe loc method?

• The 'loc' function is used to access only rows

• The 'loc' function is used to access only columns

• The 'loc' function is used to access the top "n" values in a given column

• The 'loc' function is used to select rows/columns by labels or integer position

What is iloc used for in a pandas dataframe context?

• Converts a column to intergers

• Selects rows/columns by integer position

• Prevents modification to the dataframe

• Interpolates missing values in the dataframe

What is the purpose of numpy in Python?

• To generate random numbers in Python

• To convert text to speech in Python

• To use arrays and perform mathematical operations on them

• To view tabular data and use table expressions