People on MSN: What Is a Zombie House? And What's the Benefit of Flipping Them?
What Is a Zombie House? And What's the Benefit of Flipping Them?
Earning your degree and landing that first position in your career field of choice might seem like an exciting finish line to what’s been many years of academic preparation and training. But in ...
The Hill: What is kratom, the herbal product with a complicated reputation?
word choice - What is the name of the symbols - and ">"?
How should I phrase "What is the first 5 digits of your home postal code" or "What are the first 5 digits of your home postal code?"
grammatical number - Which is correct: "What is" or "What are ...
word choice - What Is the Real Name of the #? - English Language ...
What is the difference between ‘Is it free’ and ‘Is it on the house?’
What is the bank address for wire transfer? The bank address for wire transfer is the physical location of the bank where the transfer is being sent or received.
What is the origin of != in the meaning "not equal to"?
I need to name a variable containing ()[]{}, what is the common name for all of them? Two side questions: parentheses is plural, or singular, or both? is abbreviating it as parens understandable?
The .agg() function allows you to choose what to do with the columns you don't want to apply operations on. If you just want to keep them (or more precisely to keep the first entries in them), use .agg(Count=('ID', 'count'), col1=('col1', 'first'), col2=('col2', 'first'),...).
Although .first() and .nth(0) can be used to get the first row, there is a difference in handling NaN or missing values. .first() give you first non-null values in each column, whereas .nth(0) returns the first row of the group, no matter what the values are.