Why do people write #!/usr/bin/env python on the first line of a Python script?

Why do people write #!/usr/bin/env python on the first line of a Python script?

python shell shebang

python

Should I put #! (shebang) in Python scripts, and what form should it take?

python shell python-3.x shebang

python

Cannot pass an argument to python with "#!/usr/bin/env python"

python arguments shebang

python

Shebang Notation: Python Scripts on Windows and Linux?

python windows linux shebang

python

What's the difference between python shebangs with /usr/bin/env rather than hard-path?

python path environment shebang

python

Proper shebang for Python script

python portability shebang

python

env: python\r: No such file or directory

python macos osx-mountain-lion shebang env

python

Shebang doesn't work with python3

python python-3.x shebang

python

shebang: use interpreter relative to the script path

python shebang

python

How to make python scripts executable on Windows? [duplicate]

python windows shebang

python

Is there a standard way to make sure a python script will be interpreted by python2 and not python3?

python unix scripting python-3.x shebang

python