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Create a simple data frame with a dictionary of lists.
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Output:
Example 2. Using the n option, which randomly selects n line numbers.
Select n line numbers at random using sample (n)
or sample (n = n)
. Each time you run this, you get n different lines.
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Output:
Example 3: Using the frac
parameter.
You can make part of the axis elements and get lines. For example, if frac = .5
then the fetch method returns 50% of the rows.
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Output:
Example 4:
First, 70% of the rows of the whole dataframe df are fetched and placed in another df1 dataframe, after which we select 50% frac from df1 .
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Output:
Example 5: select multiple lines at random with replace = false
parameter replace d Gives permission to select one row many times (for example). The default value for the replacement parameter of the sample ()
method — False, so you never select more than the total number of rows.
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Output:
Example 6 Select more than n lines, where n — total number of lines using replace
.
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Output:
Example 7. Using weights
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Output:
Example 8: Using an axis
An axis takes a number or a name. The sample ()
method also allows users to select columns instead of rows using the axis argument.
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Output:
–° tutorial # 2: Using NumPy
Numpy has chosen how much index to include for random selection, and we can allow replacement.
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Output:
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How to randomly select rows from Pandas DataFrame __del__: Questions
How can I make a time delay in Python?
5 answers
I would like to know how to put a time delay in a Python script.
Answer #1
import time
time.sleep(5) # Delays for 5 seconds. You can also use a float value.
Here is another example where something is run approximately once a minute:
import time
while True:
print("This prints once a minute.")
time.sleep(60) # Delay for 1 minute (60 seconds).
Answer #2
You can use the sleep()
function in the time
module. It can take a float argument for sub-second resolution.
from time import sleep
sleep(0.1) # Time in seconds
How to randomly select rows from Pandas DataFrame __del__: Questions
How to delete a file or folder in Python?
5 answers
How do I delete a file or folder in Python?
Answer #1
os.remove()
removes a file.os.rmdir()
removes an empty directory.shutil.rmtree()
deletes a directory and all its contents.
Path
objects from the Python 3.4+ pathlib
module also expose these instance methods:
pathlib.Path.unlink()
removes a file or symbolic link.pathlib.Path.rmdir()
removes an empty directory.
We hope this article has helped you to resolve the problem. Apart from How to randomly select rows from Pandas DataFrame, check other __del__-related topics.
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Prague | 2023-02-02
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