Python about entering parameters, is it a pointer or a reference

By chance, I saw other people’s code and found that some of them would pass in parameters. Do a copy and experiment. Regarding the input parameters, is it a pointer or a reference?

Let me talk about my conclusion:

1. If the input is a simple type, then the input should be a quoted value,
2. If the type of df is passed in, then the pointer is passed in.
3. The modification you make in the function will still change the original df. It is best to copy the complex type of variables in the function!

'''
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'''
import pandas as pd
def qqq(a,b):
    a.loc[1,1] = 9999
    b = 88888
    del a
    del b

if __name__ == '__main__':
    aaa = pd.DataFrame([[1,2,3],[4,5,6]])
    bbb = 123000
    qqq(aaa, bbb)
    print('aaa:\n',aaa,'\n')
    print('bbb:',bbb)

Output:

aaa:
   0     1  2
0  1     2  3
1  4  9999  6

bbb: 123000