Merk
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Returns the first n rows.
Syntax
head(n: Optional[int] = None)
Parameters
| Parameter | Type | Description |
|---|---|---|
n |
int, optional | default 1. Number of rows to return. |
Returns
If n is supplied, return a list of Row of length n or less if the DataFrame has fewer elements. If n is missing, return a single Row.
Notes
This method should only be used if the resulting array is expected to be small, as all the data is loaded into the driver's memory.
Examples
df = spark.createDataFrame([
(2, "Alice"), (5, "Bob")], schema=["age", "name"])
df.head()
# Row(age=2, name='Alice')
df.head(1)
# [Row(age=2, name='Alice')]
df.head(0)
# []