Recall & Review
beginner
What is a common cause of encoding issues when reading files in pandas?
Encoding issues often happen because the file uses a different character encoding than the default one pandas expects, like UTF-8. For example, a file might be encoded in 'latin1' or 'cp1252', causing errors if not specified.
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beginner
How do you specify the encoding when reading a CSV file with pandas?
You use the 'encoding' parameter in the read_csv function. For example: pd.read_csv('file.csv', encoding='latin1') tells pandas to read the file using the 'latin1' encoding.
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beginner
What does the error 'UnicodeDecodeError' mean when loading data?
It means pandas tried to read the file using the wrong encoding and found bytes it could not convert to characters. This usually means you need to specify the correct encoding when reading the file.
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intermediate
What is the difference between 'utf-8' and 'latin1' encoding?
'utf-8' can represent many characters from many languages and is the most common encoding today. 'latin1' (also called ISO-8859-1) is older and supports mainly Western European characters. Using the wrong one can cause errors or wrong characters.
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intermediate
How can you check the encoding of a file before reading it in pandas?
You can use external tools like the 'file' command in Linux or Python libraries like 'chardet' to guess the encoding. This helps you know which encoding to specify when reading the file.
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Which pandas parameter helps fix encoding issues when reading a CSV?
✗ Incorrect
The 'encoding' parameter tells pandas which character encoding to use when reading the file.
What error usually appears if pandas reads a file with the wrong encoding?
✗ Incorrect
'UnicodeDecodeError' happens when pandas cannot decode bytes using the assumed encoding.
If a file contains Western European characters, which encoding might you try?
✗ Incorrect
'latin1' supports Western European characters and can help fix encoding errors.
What Python library can help detect a file's encoding?
✗ Incorrect
'chardet' is a library used to guess the encoding of text files.
What is the default encoding pandas uses if none is specified?
✗ Incorrect
Pandas defaults to 'utf-8' encoding when reading files.
Explain why encoding issues happen when reading files and how to fix them in pandas.
Think about how computers read characters and what happens if the wrong code is used.
You got /4 concepts.
Describe how you would find out the encoding of a file before loading it into pandas.
Consider tools or libraries that analyze file content.
You got /4 concepts.