[Python] drop.na code doesn't show up when using print(data_frame) [duplicate]

I wanna delete missing values from a certain column:

#deleting rows with missing values
data_excel.dropna(subset=['Budget Betrag'])


then I wanna check whether it's working with

print(data_excel)


But with print(data_excel) the drop.na code doesn't show up.

I just see the changes when i use print(data_excel.dropna(subset=['Budget Betrag']))

What am I doing wrong? I also deleted columns before and i could use the print(data_excel) properly.

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