after using print function, how can i get the print data

You can capture the output of the print function by redirecting it to a variable using the "redirect_stdout" method from the "contextlib" module. Here's an example:

from contextlib import redirect_stdout
from io import StringIO

# create a StringIO object to capture the output
output = StringIO()

# redirect the output of the print function to the StringIO object
with redirect_stdout(output):
    print("Hello, world!")

# get the captured output as a string
output_str = output.getvalue()

# print the captured output
print(output_str)

This will output:

Hello, world!