install python 3 9 ubuntu

1sudo apt-get install python3

1- Run the following commands as root or user with sudo access to update the packages list and install the prerequisites:
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3sudo apt update
4sudo apt install software-properties-common
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6- Add the deadsnakes PPA to your system’s sources list:
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8sudo add-apt-repository ppa:deadsnakes/ppa
9When prompted press Enter to continue:
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11- Press [ENTER] to continue or Ctrl-c to cancel adding it.
12- Once the repository is enabled, install Python 3.8 with:
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14sudo apt install python3.8
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16- Verify that the installation was successful by typing:
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18python3.8 --version