How to use 'python shebang' in Python

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110def _patch_shebang(filepath):
111 new_shebang=get_python3_shebang()
112 print("Update shebang in '%s' to %r" % (filepath, new_shebang))
113 with filepath.open("r+") as f:
114 content = f.read()
115 f.seek(0)
116
117 new_content=content.replace("#!/usr/bin/env python", new_shebang)
118
119 if new_content == content:
120 print("WARNING: Shebang not updated in '%s'!" % filepath)
121 else:
122 f.write(new_content)
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